SUBJECT INDEXINDUSTRIAL AND ENGINEERING CHEMISTRY

ANALYTICAL EDITION VOLUME 8— 1936

A BRASIO N of Floors, Accelerated Method for Determining WearCaused by. F. D. Snell and K. W . Haeseler........................................ 191

Absorption, Laboratory Gas— Vessels. W . M. M artin............................ 395Acetyl, Scnii-Microdctermination of. E. P. Clark.................................... 487Acetyl Groups, Microestimation of. Adalbert Elek and R. A. ITarte.. 267A c i d s :

Borax as Acidiinetrio Standard. F. II. Hurley, Jr................................ 220Determination of Acidity in Insulating Oil. R . N. Evans and J. E.

Daveiu>ort.......................................... >............ 287Higher Fatty, Determination of Neutral Equivalents of. R . B.

Sandin, M. Kulka, and D. W . W oolley................................................ 355Volatile Fatty, Determination of— by Partition Method. O. L. Os-

burn, II. G. W ood, and C. H. Workman.............................................. 270Adiabatic Calorimeter. See Calorimeter.A g i t a t i o n :

New Sealed Stirrer for Laboratory. L. S. Powell................................ 488New Type Laboratory Stirrer. E. B. Hershberg.......................... 313Rapid and Efficient Mixer. D. H. Nelson...................................... I l lSimple Laboratory Shaking Machine. J. H. Ilighberger........... 227

Alcohol. See n-Butanol.Alkali Titration. See Titration.Alkaline Earth and Alkali Groups, System for Qualitative Analysis of.

C. H. Greene. (Correction, 457)............................................................... 346Alkyd Resins. See Resins.Aluminous Material, Determination of Sodium in. II. V. Churchill,

R. W . Bridges, and A. L. Miller................................................................. 348Aluminum, Quantitative Separation and Determination of Zinc and.

F. H. Fish and J. M. Smith, Jr. (Correction. 4 7 7 ).. .................... 349American Chemical Society Committee. See Oils.Ammonia Nitrogen. See Nitrogen.Ammonia-Sodium Method. See Sulfur. #Ammonium Iodide, Separation of Stannic Oxide from Various Oxides

by Ignition with. E. R. Caley and M. G. Burford......................... 114Amylase Action. See Sugar.Analysis, Problems in.................................................................................. 410Analytical Edition, Note to Authors of.....................................................67, 232Antimony, Microscopical Qualitative Analysis of Bismuth and. F. T.

Jones and C. W. M ason........................................................................ 428(See also Electrolysis.)

Apparatus, New— for Analytical Laboratories. Crucible Support for Desiccators, Graduated Cylinder, and Flask Cover. F. E. Tuttle. . 230

Arsenic, Determination of— in Silver Arsenate. Austin Pomerantz andW. M. M cN abb....................................................................................... 466

Arsenite-Persulfate Method. See Steel.A s p h a l t :

Change of Penetration with Temperature of. I. Bencowitz and E. S.B oe........................ 157

Measuring Susceptibility of— to Temperature Changes. A. Holmes,J. O. Collins, and W. C. C h ild . ........................................................ 100

Saponification Numbers of Asphaltic Petroleum Residues. J. H.Bruun and L. W. Claffey.................................................................. 255

Authors, Note to— of Analytical Edition .................................... 67, 232Automotive Lubricants. See Petroleum Lubricants.

BALA N CE , Automatic Recording. D. S. Binnington and W. F.Geddes...................................... 76

Balance, Micro-, Control of High Lights in Reading— Swings. P. H .M .-P. B rinton.. ............................................................. 104

Ball Mill, Inexpensive. L. L. Quill............................................................... 27Barium, Separation of Strontium, Lead, and— from Calcium and Other

Metals. II. H. Willard and E. W . Goodspeed...................................... 414Barium Chroraate. See Water.Barium Oxide, Rate of Drying a Desiccator with— and Other Drying

Agents. H» S. Booth and Lucille M cIntyre............................................. 148Barium Sulfate. See Sulfur.Benzene. See Petroleum.Bichromate-Pyridine Method. See Mercury.Biological Material, Microdetermination of Fluorine ip. W . D . Arm­

strong....................................................................................................... 384«.« '-B ipyrid ine Colorimetry. See Colorimetric Determinations.B i s m d t h :

Determination of— as Phosphate. W. C. Blasdale and W. C. Parle. 352 Microscopical Qualitative Analysis of Antimony and. F. T. Jones

and C. W. M ason........................................................................................ 428Separation and Determination of— with Gallic Acid. L. Kieft and

G. C. Chandlee. .................................................................................... 392(See also Electrolysis.)

Bituminous Plastics. See Plastics. ^Blank, Calculating the— in Volumetric Determinations. Bartholow

Park..................................................................................................................... 32B o i l i n g P o i n t :

Laboratory-Scale Ebullition Tube. J. W. Boegei................................... 476Micromethod for Determining— of Liquids at Different Pressures.

E. E. Hays, F . W. Hart, and R. G. Gustavson................................ 286Semi-Micro-Cottrell Apparatus for Determining. M . L. Willard

and D. E. Crabtree.............................. 79Borax as Acidimétrie Standard. F. H. Hurley, Jr.................................... 220Bread, Estimation of Milk Solids in. Charles Hoffman, T. R,.

Schweitzer, and Gaston D alby....................................................................... 298

Bromine, Determination of Iodine and— in Presence of Each Other.Ladislaus Spitzer ..................................................................................

Bubble-Cap Columns. See Distillation.Buffer Capacity of Tom ato Juice. Margarcthe Oakley and J. C.

Krantz, Jr..........................................................................................................Buret, New— for Alkali Titrations. L. S. Keyser.....................................Buret, New— for Potentiometric Titrations. L. S. Keyser....................Burner, Rodgers Ring, Improved Design of. G. F. Smith....................Butane, Corrosion Test Methods on Liquid— as M otor Fuel. M. M .

H olm ...................................................................................................................n-Butanol, Glass Electrode in— for Determining Acidity in Insulating

Oil. R . N. Evans and J. E. Davenport...................................................Butter Fat. See Oils.

C A B L E Insulation. Sec Insulation.Cadmium, Quantitative Determination of— and Lead in Zinc. H. M.

Sullivan ..................... .............. ............................................................Calcium, Separation of Strontium, Barium, and Lead from— and Other

Metals. II. II. Willard and E. W. Goodspeed.......................................Calorimeter, Adiabatic. Whitney Weinrich and Hannibal Gaspari... Carbon Microdetermination. See Microanalyscs.Carbon Dioxide, Improved Method for Determining Reactivity of Coke

in. D. A. Reynolds and J. D. D avis........................................................Carbon Dioxide, Micro-Dumas Generation of. W. S. Ide.....................Carbon Tetrachloride, Determination of Phosgene in Gases from Ex­

perimental Fires Extinguished with. W. P. Yant, J. C. Olsen, H.H. Storch, J. B. Littlefield, and Leopold Scheflan...............................

Carbon Tetrachloride, Vaporized, Quantitative Determination of Con­centration of. J. C. Olsen, H. F. Smyth, Jr., G. E. Ferguson, andLeopold Scheflan. (Correction, 323).........................................................

Carnotite. See Radium.Catalytic Hydrogenation. See Hydrocarbons.Catechol, 4-Nitro— as Titration Indicator. S. R. Cooper and V. J.

Tulane.................................................................................................................Cement, Accelerated Test for Determining Resistance of Portland—

to Sulfate Waters. R. W . Stcnzel.............................................................Centrifugal Filtration Tube. D. F. Houston and C. P. Saylor...............Ceric Ammonium Sulfate. See Silver Titration.Ceric Sulfate, Volumetric Determination of Iodides by. David Lewis. Charring. See Heater.Charts. See Nomographs.Check Valve. See Valve.Chloride Ion, Titration of— with Mercuric Nitrate Solutions. Irving

Roberts...............................................................................................................Chlorinated Hydrocarbons. See Hydrocarbons.Chloroform, Recovering—from Used Dithizone Solutions. D . A.

B i d d l e . . . . . . . ; .................................................................................................Chromium in Silicate Rocks. See Silicate Rocks.Chromous Sulfate, Preparation and Storage of Standard— Solutions.

H. W. Stone and Carrol Beeson..............................................................C o a l :

Analyses and Softening Temperatures of— Ash. D . J. Jones and E.L. Buller.........................................................................................................

Analysis of Bituminous—and Derived Products. Direct Simulta­neous Microdetermination of Carbon, Hydrogen, and Oxygen.IV. W . R. Kirner............................................................. . . .

Improved M ethod for Determining Reactivity of Coke in CarbonDioxide. D. A. Reynolds and J. D. Davis.........................................

Plasticity of. R . E. Brewer and R. G. Atkinson.....................................Coal-Tar Disinfectants. See Germicide.Coke. See Coal.Coke-Oven Gas. See Gases.Colorimeter, Precision Photoelectric, Design of. R . B. Withrow, C. L.

Shrewsbury, and II. R. Kraybill.................................................................C o l o r i m e t r i c D e t e r m i n a t i o n s :

Chromium, Vanadium, and Molybdenum in Silicate Rocks. E. B.Sandell............................................................................................................

Cyclopentadiene. B. N. Afanasiev...........................................................Determination of Iron by Titanium Titration and by a.a '-B ipyridine

Colorimetry. W. D. McFarlane............................................................New Procedure for Selenium Determination. K . W . Franke, Robert

Burris, and R. S. Hutton..........................................................................Peroxides in Unsaturated Compounds. C. A. Young, R. R. Vogt,

and J. A. Nieuwland. ...................................................................... .Preparation of Raw Sugar Solutions for Turbidity and. Turbidity

in Sugar Products. IV. F. W. Zerban and Louis Sattler.............Rotenone. H. D. Rogers and J. A. Calamari........................................Silica in Boiler Water. M. C. Schwartz (Correction).........................Solutions for Colorimetric Standards. V II. Aqueous Solutions of

Salts of Elements 23 to 29. C. T . Kasline with M. G. M ellon. . . . Combustion Apparatus, Organic— for Highly Volatile and for Inflam­

mable Liquids. J. H. Bruun and W. B. M . Faulconer..........................Combustion M ethod for Determining Sulfur in Plain and A lloy Steels.

C. II. Hale, Jr., and W. F. Muehlberg......................................................Conductance Meter. See Meter.Conductometric Determination of Enzyme Activity. B. N. Sastri and

M . Sreenivasaya...............................................................................................C o p p e r :

Adjustment of pH in Iodometric Determination of. W . R. Crowell, T . E. Hillis, S. C. Rittenberg, and R. F. Evenson..............................

492

20512182

484

299

287

465

382

414307

3356

20

260

210

263302

199

365

99

188

25

57

33443

214

33615

124

435

198

168135323

463

315

317

458

9

NOVEMBER 15, 1936 ANALYTICAL EDITION 493

Determination of Metallic— in Cuprous Oxide-Cupric Oxide Mix­tures. L. C. Hurd and A. R. Clark..................................................... 380

Electroanalysis of Silver— Alloys. W . L. M iller..................... ............. 431Iodometric Method for Determining— in Presence of Interfering Ele­

ments. H. W . Foote and J. E. Vance................................................. 119Microscopical Estimation of Cuprous Oxide, Cupric Oxide, and

Copper in Mixtures. S. Zerfosa and M. L. W illard............................ 303Preparation of Flattened— Tubing Coils. E. P. and W. L. B arrett.. 311Spectrophotometric Determination of— in Ores and Mattes. J. P.

Mehlig (Correction)..................................................................................... 257Standardization of Sodium Thiosulfate Iodometrically against. L.

O. H ill .“ . . . 200(See also Electrolysis.) t

Copper Chloride-Perchloric Acid Method. See Selenium.Corrosion Test Methods on Liquid Butane as M otor Fuel. M . M.

H olm ......................................................................................................... 299Cottrell Apparatus. See Boiling Point.Crucible Support. See Apparatus, New.Crystalline Materials, Identification of— by X -R ay Diffraction Pat­

terns. J. D. Hanawalt and H. W. Rinn....................................... 244Cupric Oxide, Cuprous Oxide. See Copper. _Cyelopentadienc, Color Reaction for Detection of. B . N. A fanasiev.. 15Cylinder, Graduated. See Apparatus, New.

D E N T A L Gold Alloys. See Gold.Desiccator, Rate of Drying a— with Barium Oxide and Other Drying

Agents. H. S. Booth and Lucille M cIntyre................................. 148(See also Apparatus, New.)

Dextrose. See Sugar.Dialyzer, Constant-Volume. C. B. Kremer........................................ 468Dialyzer, Electro-, Simple Inexpensive. F. E. B artell.................... 247Dichromate, Oxidation-Reduction Indicators for Use with. II. Stu­

art Cohen and R. E. Ocsper.................................................................. 364Diphenyl Amine Indicator Solution, Preparation of. H. M . S ta te .. . . 259Diphenyl Carbazide Indicator in Titration of Chloride Ion w’ith Mer­

curio Nitrate Solutions. _ Irving Roberts........................................... 365Disinfectant. See Germicide.D i s t i l l a t i o n :

Apparatus for Fractional— of Liquefied Gases. Arthur R ose i 478Battery-Type Stand Assembly for— Equipment. R. L. M o b le y .. . . 281Construction of Glass Helices for Packing Fractionating Columns.

W . W . Stewart....................................................................................... 451Fractional, Condenser System for. E. A. Means and E. L. Newman 231Glnss Head for Laboratory Water Still. P. F. Sharp and E. B.

Struble ............................................................................................. 316Ivjeldahl. «See Nitrogen.Laboratory Bubble-Cap Columns of Glass. J. H . Bruun.................. 224Micro— Apparatus. L. C. Craig................................................................ 219Tube for Moisture Measurement by. H. B. Alexander................ 314

Dithizone as Reagent for Dissolving and Determining Spray ResidueLead. W. E. W hite............................................................... 231

Dithizone, Recovering Chloroform from Used— Solutions. D. A.Biddle........................................................................................................... 99

Drying. See Desiccator and Heater.Dumas Method. «See Microanalyses. ̂ . . .Dusts, X -R ay Diffraction Method for Quantitative Analysis of— in

Mines. G. L. Clark and D . H. Reynolds................................................ 36

EGGS:Location of Antienzyme in— White. J. S. Hughes, II. M. Scott, and

J. Antelyes..................................................... ............................j .............. j 310Microdetermination of Ammonia Nitrogen in. S. L. Bandemer and

P. J. Schaible '............................................................................... • • ■ 201Sampling and Analysis of. W . S. Guthmann and W. L. Terre. (Cor­

rection, 4 5 9 )... ........................................................_.................................. 377Electroanalysis of Silver-Copper Alloys. W . L. M iller........................... 431Electrode. See Glnss Electrode.Electrodialyzer. «See Dialyzer. # < tElectrolysis, “ Internal,” Analysis by. Determination of Bismuth and

Copper in Lead Alloys Containing Antimony and Tin. B. L. Clarke,L. A. Wooten, and C. L. Luke.............................................................. 411

Electron-Tube Conductance Meter. See Meter. .Enzyme Activity, Conductometric Determination of. B. N. Sastri and

M. Srecnivasaya............................................................................................... 458Eosin. «See Sulfates.Evaporation. See Heater.Evaporation of Solvents. See Solvents.Extraction, Approach towards the Limit in Process of. C. W . Griffin

and Margaretha von Saaf....................................................................... 358E x t r a c t o r :

Efficient— for Laboratory. F. C. Oppen.......................................... 110Fat— for Feeds. C. E. Weakley, Jr........................ . ................. • • • • • 388Metal— for Laboratory. J. M , Lemon, F. P. Griffiths, and M . E.

Stansby........................................................................................................... 462

FA TS. «See Oils.Fatty Acids. See Acids. rFeeds, Fat-Extraction Apparatus for. C. E. Weakley, Jr. . ............. . . . 388Ferrocyanide Ion, Determination of— by Luteocobaltammine Chloride.

W. A. Hynes, M . G. Malko, and L. K . Yanowski.............................. 356Ferrotungsten. «See Steel. , .Fiber, Prevention of Foaming in Crude— Determinations. H. vv. Ger-

ritz................................................................................._.............. 75Films, Measuring Thickness of— of Thin, Flowing Liquids. H. H.

Beck and K. G. W eckel........................................................................ 258Filtration, Centrifugal— Tube. D. F. Houston and C. P. Saylor........ 302Fir. See W ood. .Fire-Extinguisher Liquid. See Carbon Tetrachloride.Flame Spectra. See Spectrographic Determinations.Flask Cover. See Apparatus, New.Floors, Abrasion of. See Abrasion.Fluorescence. See Spectrographic Analysis.F l u o r i n e : # , .

Improved Apparatus for Isolation of— by Willard and WinterMethod. W. K. Gilkey, H . L. Rohs, and H. V. Hansen.............. 150

Method for Determining Fluoride in Spray Residue on Food Prod­ucts. W. M . Hoskins and C. A. Ferris................................................ 6

Microdetermination of. W. D. Armstrong............................................. 384Nephelometric Determination of. R . E. Stevens. . . ; .......................... 248

Food, Method for Determining Fluoride in Spray Residue on— Prod­ucts. W. M . Hoskins and C. A. Ferris.................................................... 6

Formic Acid, Determination of— in Pyroligneous Liquors. H. D.Weihe and P. B. Jacobs.......................................................................... 44

Fractionation. See Distillation.Fuel, M otor. See Petroleum.Furfural, 5-Methyl-, Quantitative Determination of. II. A. Iddles and

K. S. French............................................................................................... 283

G A L L IC Acid, Separation and Determination of Bismuth with. L.Kieft and G. C. Chandlee....................................................................... 392

G a s e s :Automatic Leveling Device for— Collection by Downward Displace­

ment of Mercury. L . D . W ilson..................................................... 488Coke-Oven, Determination of Nitric Oxide in. J. A. Shaw. (Cor­

rection, 281)............................................................................................ 162Laboratory— Absorption Vessels. W . M . M artin.......................... 395liquefied, Apparatus for Fractional Distillation of. Arthur Ito3e. . . 478Sodium Hyposulfite Solutions for Absorption of Oxygen in— Analy­

ses. Dorothy Ouiggle................................................................................ 363Gasoline. See Petroleum.Geilmann Reaction. See Rhenium.Germicide, Limitations of B. typhosus Phenol Coefficient as Measure of

Bactericidal Value of Coal-Tar Disinfectants. Emil Klarmann andV. A. Shternov.......................................................... i .................................. 369

G l a s s :Electrodes of— in n-Butanol for Determining Acidity in Insulating

Oil. R . N. Evans and J. E. Davenport................................................ 287Laboratory Bubble-Cap Columns of. J. II. Bruun.............................. 224Manmulator for Blowing. Vines Collier, Jr................................ 208One-Piece— Micro-Kjeldahl Distillation Apparatus. P. L. K ir k .. . . 223

Glucosides. «Sec Salicin.Glycerol, Determination of Water in. C. P. Spaeth and G. F. Hutchi­

son ................................................................................... 29Gold, Determination of— in Dental— Alloys. J. L. M aynard................ 368Grapefruit. Solubility of Naringin in Water. G. N. Pulley................ 360Gravimetric Determination of Mercury. Accurate Separation of Pre­

cipitated Mercuric Sulfide and Sulfur in. E. R. Caley and M . G.Burford................................................................................................ 43

Gravimetric Determination of Selenium in Alloy Steel. Louis Silver­man....................................................................................................................... 132

Guanidines. «See Rubber.

H E A T E R , Overhead— for Rapid Evaporation, Drying, and Charring.L. F. Nims and M. K . Ilorw itt................................................................... 275

Helices. «See Distillation.Hevea Latex. «See Rubber.Hcxanitrato Ammonium Cerate as Proposed Reference Standard in

Oxidimetry. G. F. Smith, V. R . Sullivan, and Gerald Frank............. 449Hill Method. See Solubility. #Humates, Determination of Iron in. N. A. Clark and D. H. Sieiing.. . 256Ilydriodic Acid, Concentrated, Detection and Separation of Difficultly

Soluble Compounds by. E. R . Caley and M. G. Burford....................... 63H y d r o c a r b o n s :

Determination of Gaseous Olefins or Hydrogen by Catalytic Hydro­genation. W . A. McMillan, H. A. Cole, and A. V. Ritchie............. 105

Determination of Vapors of Chlorinated— in Air. II. F. Smyth, Jr.. 379 Organic Combustion Apparatus for Highly Volatile and for Inflam­

mable Liquids. J. H . Bruun and W . B. M . Faulconer...................... 315(See also kind o f hydrocarbon and Petroleum.)

Hydrogen, Determination of Gaseous Olefins or— by Catalytic Hydro­genation. W. A. McMillan, II. A. Cole, and A. V. R itchie.................. 105

Hydrogen Microdetermination. «Sec Microanalyses.Hydrogen-Ion Concentration, Adjustment of— in Iodometric Deter­

mination of Copper. W. R . Crowell, T . E. Hillis, S. C. Rittenberg,and R. F. Evenson................................ 9

Hydrogen-Ion Concentration. Simplification of Isohydric IndicatorMethod. Sverre Stene.......................... _....................................................... 398

Hydroxyl Groups, Determination of— in Organic Compounds. M .Freed and A. M . W ynne................................................................................ 278

Hygroscopic Substances, Drying and Analysis of. Organic M icro­analysis. II. R . T . Milner and M . S. Sherman................................... 427

ICE Cream, Estimation of Oleomargarine in. T . H. Whitehead andJ. B. Dunson...................................................................................................... 203

I n d i c a t o r s :Future Development of. I. M . Kolthoff................................................. 237Oxidation-Reduction— for Use w'ith Dichromate. II. Stuart Co­

hen with It. E . Oesper................................................................................ 364Simplification of Isohydric— M ethod. Sverre Stene............................ 398(«See also kind o f indicator.)

Indium, Rapid Method for Volumetric Determination of. H. B.Hope, Madeline Ross, and J. F. Skelly..................................................... 51

Industrial and Engineering Chemistry. See Analytical Edition.Inks, Iron Gallate, Liquid and Powder.......................................................... 19Inorganic Analysis, Organic Reagents in. F. Feigl......................... 401Insecticidal Dusts. Particle Size of. L. D . Goodhue and C. M . S m ith .. 469Insecticide. Method for Determining Fluoride in Spray Residue on

Food Products. W. M. Hoskins and C. A. Ferris................................ 6Insulating Oil. «See Petroleum.Insulating Wires, Spindle for. J. M . Sturtevant. ............ 341Insulation for Cables. Determination of Viscosity of Small Samples of

Oil from Oil-Impregnated Paper. H. F. Schneider, Jr., and T. A.McConnell.......................................................................................................... 28

Iodides, Volumetric Determination of— by Ceric Sulfate. Applicationof Indicator o-Phenanthroline Ferrous Ion. David Lewis.................. 199

Iodine, Determination of— and Bromine in Presence of Each Other.Ladislaus Spitzer.............................................................................................. 465

Iodine, Nomograph for— Value of Tung Oil. C. S. Wan and K. I I o . . . 282Iodohydroxyquinoline Sulfonic Acid. See Iron.I o d o m e t r i c D e t e r m i n a t i o n s :

Adjustment of pH in— of Copper. W . It. Crowell, T . E. Hillis, S. C.Rittenberg, and R. F. Evenson............................................................... 9

Copper in Presence of Interfering Elements. H. W . Foote and J. E.Vance.....................................................; ............r................................... #. . . 119

Semi-Micromethod for— of Maltose in Studies of Amylase Action.M. L. Caldwell, S. E. Doebbeling, and S. H. Manian........................ 181

Standardization of Sodium Thiosulfate against Copper. L. O. H ill.. 200 I r o n : _ , #

Determination of— by Titanium Titration and by ar,a'-Bipyridine Colorimetry. W . D. McFarlane............................................................ 124

491 INDUSTRIAL AND ENGINEERING CHEMISTRY YOL. 8, NO. 6

Determination of— in Humates by Iodohydroxyquinoline SulfonicAcid. N. A. Clark and D . H. Sieling.................................................. 256

Determination of— in Sea Water. N. W. Rakestraw, H. E.Mahncke, and E. F. Beach...................................................................... 136

Photometric Determination of— in Used Engine Oils. A . R . Res-corla, E. M . Fry. and F. L. Carnahan.................................................. 242

Iron Gailate Inks. See Inks.Isohydric Indicator. See Indicators.

K E ROSEN E. See Petroleum.Kjeldahl M ethod. See Nitrogen.

LA N T H A N U M , Determination of— , Yttrium, and Ytterbium fromSpark in Flame Spectra. O. S. Plantinga and C. J. Rodden................. 232

Latex. See Rubber.L e a d : .

Errors in Microweighing Due to Use of— Shot in Tares. R. J. Wil­liams • • • • ............ 229

Quantitative Determination of Cadmium and— in Zinc. H. M.Sullivan.......................................................................................................... 382

Separation of Strontium. Barium, and— from Calcium and OtherMetals. H. H. Willard and E. W. Goodspeed.................................... 414

Spray Residue, Dithizone as Reagent for Dissolving and Determin­ing. W . E. W hite...................................................................................... 231

Lead Alloys. See Electrolysis.Lead Nitrate, Determination of Sulfate by Titration with— Using Eo­

sin as Indicator. J. E. R icci....................................................................... 130Levulose. See Sugar.Lignin. See Wood.Liquid Films. See Films.Liquids, Precision Pycnometer for. S. T . Yuster and L. H. Reyerson.. 61Liquids, Viscous, Surface-Tension Measurements of. A. H. Pfund and

E. W. Greenfield.......................................................................................... 81Lubricants. See Petroleum.Luteocobaltammine Chloride, Determination of Ferrocyanide Ion by.

W. A. Hynes, M . G. Malko, and L. K. Yanowski................................ 356

M A C R O -K JE L D A H L Apparatus. See Nitrogen.Magnesium Uranyl Acetate Reagent, Sensitiveness of— to Sodium and

Potassium. C. H. Greene............................................................................ 399Maltose. See Sugar.Manganese. See Steel and Tungsten.Manometer, Micro-, Improved. H. W . Smith, Jr ...................... 151Mattes, Spectrophotometrio Determination of Copper in Ores and.

J. P. Menlig (Correction).................................................. 257Melting Point Apparatus, Electrically neated. Edwin Dowzard and

M. J. Russo............................... 74Melting Point Apparatus, Precision. E. B. Hershberg.......................... 312Mercaptans, Potentiometric Determination of. M . W. Tamele and

L. B. Ryland..................................................................................................... 16Mercuric Nitrate, Titration of Chloride Ion with— Solutions. Irving

Roberts............................ ..... ............................................................................. 365Mercuric Sulfide. See next item. _ _ _Mercury, Accurate Separation of Precipitated Mercuric Sulfide and

Sulfur in Gravimetric Determination of. E. R. Caley and M. G.Burford............................................................................................................... 43

Mercury, Determination of— by Improved Bichromate-PyridineMethod. N. H. Furman and II. M. State.............................................. 467

Metallic Oxides. See Stannic Oxide.M e t a l s : .

Assay of Platinum Group of. F. E. Beamish and J. J. Russell.. . . 141Device for Determining Rate of Siphoning in— Extraction Systems.

R. S. Asbury................................................................................................. 152(See also kind o f metal.) # , _ ,

Meter, Electron-Tube Conductance— Reading Continuously. R . L.Garman......................................... 146

5-M ethyl Furfural. See Furfural.M i c r o a n a l y s e s :

Acetyl Groups. Adalbert Elek and R. A. Harte......................... 267Ammonia Nitrogen in Eggs. S. L. Bandemer and P. J. Schaible.. 201Carbon and Hydrogen in Compounds Containing Arsenic, Anti­

mony, Tin, Bismuth, and Phosphorus. F. C. Siibert and W. R.Kirner..................................................... ... .. . •••••:.............................. 353

Determination of Boiling Points of Liquids at Different Pressures.E . E. Hays, F. W. Hart, and R. G. Gustavson................................ 286

Determination of Semi-Microquantities of Phosphates. N. H.Furman and H. M . State.......................................................................... 420

Direct Simultaneous— of Carbon, Hydrogen, and Oxygen. IV. Analysis of Bituminous Coals and Derived Products. W. R.Kirner........................................................................ *,.................................. 57

Dumas Generation of Carbon Dioxide. W. S. Id e .............................. 56Estimation of Cuprous Oxide, Cupric Oxide, and Copper in Mix­

tures. S. Zerfoss and M . L. W illard.................................................... 303Fluorine. W. D. Armstrong.................................. 384Handling and Weighing Absorption Tubes in— of Carbon and

Hydrogen. D . F. Hayman............................ ........................................ 342Microscopical Qualitative Analysis of Antimony and Bismuth.

F. T . Jones and C. W . Mason......................................, ......................... 428Organic. R . T . Milner and M . S. Sherman:

I. Nitrogen by Dumas Method............................................................ 331II. Drying and Analysis of Hygroscopic Substances...................... 427

Semi— for Basic Nitrogen in Plant Tissues. W . W. Umbreit andP. W. W ilson................................................................................................ 361

Semi— for Iodometric Determination of Maltose in Studies of Amylase Action. M . L. Caldwell, S. E. Doebbeling, and S. H.Manian........................................... . ............................................................. 181

Semi— for Nitrogen. A. R. Ronzio.......................................................... 122Semi— of Acetyl. E. P. Clark..................................................................... 487Spectrographic— of Zinc. A. P. Vanselow and B. M . Laurance

(Correction, 400).......................................................................................... 240Standard Liquids for M icroscopic Determination of Refractive

Index. A. H. Kunz and J. Spulnik...................................................... 485Microbalance. See Balance. ,Micro-Cottrell Apparatus. See Boiling Point.Microdistillation. See Distillation.Micro-Kjeldahl Distillation. See Nitrogen.Micromanometer, Improved. H. W . Smith, Jr......................................... 151Microscopy, Fluorescent Light. C. J. Frosch and E. A. Hauser 423Microvaporimetry. See Vaporimetric Determinations.Microweighing. See-Weighing.

Milk, Estimation of— Solids in Bread. Charles Hoffman, T . R.Schweitzer, and Gaston D alby.................................................................... 298

Milk. Measuring Thickness of Thin, Flowing, Liquid E^lms. H . H.Beck and K . G. W eckel................................................................................. 258

Mjne Dusts. See Dusts.Minerals, Nephelometric Determination of Fluorine in. R. E. Stevens 248Mixer, Rapid and Efficient. D. H. Nelson................................................. I l lMoisture. Sec Water.Molecular Weight, Microvaporimetric Determination of. J. B . Nie-

derl, O. R. Trautz, and A. A. Plentl.......................................................... 252Molecular Weights, Nomographs for Determining— by Freezing and

Boiling Point-Methods. W. S. G ilfoil...................................................... 228Molybdenum in Silicate Rocks. See Silicate Rocks.Motor Fuels. See Petroleum.

NAPH TH A. See Petroleum.Naphthenic Acid as Diluent in Measurement of Flow Rates of Hot-Oil

Streams by Dilution Method. T . A. Mangelsdorf, B. L. Sowers, andA. J. Deutser................................................................................................ 440

Naphthidine, Preparation of. Stuart Cohen and R. E. Oesper 306Naringin. See Grapefruit.Nephelometric Determination of Fluorine. R. E. Stevens..................... 248Nesslerization. See Nitrogen.Nitric Oxide, Determination of— in Coke-Oven Gas. J. A. Shaw.

(Correction, 281).............................................................................................. 162Nitrobenzene. See Petroleum Lubricants.4-Nitrocatechol. See Catechol.N i t r o g e n :

Application of Semi-Micro-Kjeldahl Method to Analysis of PlantTissue. W. W . Umbreit and V. S. B ond............................................ 276

Determination by Dumas Method. Organic Microanalysis. I.R. T. Milner and M. S. Sherman........................................................... 331

Method of Eliminating Loss of— as Ammonia in Kjeldahl Distilla­tions. H. S. Miller.................................................................................... 50

Microdetermination of Ammonia— in Eggs. S. L. Bandemer andP. J. Schaible................................................................................................ 201

Nesslerization Applied Directly to Macro-Kjeldahl— Determination.Sergius Morgulis and H. C. Spencer...................................................... 330

One-Piece Glass Micro-Kjeldahl Distillation Apparatus. P. L. Kirk 223Semi-Microanalysis of. A. R. Ronzio....................................................... 122 •Semi-Micromethod for Determining Basic— in Plant Tissues. W. W.

Umbreit and P. W. W ilson ...................................................................... 361Simple M icro- and Macro-Kjeldahl Steam Distillation Apparatus.

J. M . F ife ................. 316Special Head for Kjeldahl Distillation Apparatus. C. E. Weakley,

Jr...................................................................................................................... 367Nomograph for Iodine Value of Tung Oil. C. S. Wan and K. H o 282Nomographs for Determining Molecular Weights by Freezing and

Boiling Point Methods. W. S. Gilfoil...................................................... 228

O IL S :Determination of Viscosity of Small Samples of— from— Impreg­

nated Paper. H. F. Schneider, Jr., and T. A. M cConnell 28Fat-Extraction Apparatus for Feeds. C. E. Weakley, J r.................. 388Pipet for Determining Acidity of. W. F. Davidson............................ 483Report of Committee on Analysis of Commercial Fats and— of

À. C. S. W. H. Irwin et al..................................................................... 233Studying the Hardness of Butter Fat. W. D. G a llup .. . . . ! ! ! ! ! ! ! 123Tung, Nomograph for Iodine Value of. C. S. Wan and K. H o. . . . 282

Olefins. See Hydrocarbons.Oleomargarine, Estimation of— in Ice Cream. T. H. Whitehead and

J. B. Dunson................ 203Ores, Spectrophotometrio Determination of Copper in Mattes and.

J. P. Mehlig (Correction).............................................................................. 257O r g a n i c C o m p o u n d s : .

Determination of Hydroxyl Groups in. M . Freed and A. M.W ynne ........................................................................................ 278

Direct Determination of Oxygen in— Containing Sulfur. W. W.Russell and M . E. Marks.......................................................................... 453

Organic Reagents in Inorganic Analysis. F. Feigl................... 401Unsaturated, Colorimetric Estimation of Peroxides in. C. A.

Young, R . R. Vogt, and J. A. Nieuwland........................................... 198Organic Microanalysis. See Microanalyses.Oxidation-Reduction Indicators. See Indicators.Oxidimetry, Hexanitrato Ammonium Cerate as Proposed Reference

Standard in. G. F. Smith, V. R. Sullivan, and Gerald Frank 449Oxygen, Direct Determination of— in Organic Sulfur Compounds.

W. W. Russell and M. E. Marks................................................................ 453Oxygen Microdetermination. See Microanalyses.

P A P E R , Oil-Impregnated, Determination of Viscosity of Small Sam­ples of Oil from. H. F. Schneider, Jr., and T. A. M cConnell 28

Paper, Zinc Pigments in— Affect a-Cellulose, Copper Number, andAcidity Tests..................................................................................................... 62

Particle Size of Insecticidal Dust. L. D . Goodhue and C. M . Smith. 469Perchloric Acid. See Selenium and Steel.Peroxides, Colorimetric Estimation of— in Unsaturated Compounds.

C. A. Young, R. R. Vogt, and J. A. Nieuwland................................. 198Persulfate-Arsenite Method. See Steel.P e t r o l e u m :

Corrosion Test Methods on Liquid Butane as M otor Fuel. M . M.Holm ............................................................................................................... 299

Determination of Acidity in Insulating Oil. R . N. Evans and J. E.Davenport........................................................... . ........................................ 287

Determination of Elementary Sulfur in Gasoline and Naphtha.Charles Wirth III and J. R. Strong...................................................... 344

Determination of Smoke Tendency of Refined Kerosene. J. B.Terry and Edward Field........................................................................... 293

Free Sulfur in— Distillates. S. Com ay.................................................... 460Lubricante:

Analytical Methods for Solvent Refining of Lubricating Oils with Nitrobenzene. S. S. Kurtz, Jr., C. E. Headington, and B.Zieber.............. 1

Laboratory Service Testing of Automotive Lubricating Greases.E. N. Klemgard................................................................................... S3

Photometric Determination of Iron in Used Engine Oils. A. R.Rescorla, E. M . Fry, and F. L. Carnahan....................................... 242

Measurement of Flow Rates of Hot-Oil Streams by Dilution Method.T. A. Mangelsdorf, B. L. Sowers, and A. J. Deutser........................ 440

NOVEMBER 15, 1936 ANALYTICAL EDITION 495

Mineral Oil-Pyrethrura Sprays. See Sprays.Physical and Chemical Properties of— Fractions. H. T. Rail and

H. M. Smith:I. Behavior in Dilute Benzene Solutions.......................................... 324II. Relations between Molecular Weight and Concentration in

Dilute Solution........................................................................................ 436Potentiometric Determination of Mercaptans. M . W. Tamele and

L. B. Ryland................................................................................................ 16(S«c also Asphalt and Hydrocarbons.)

o-Phenanthroline Ferrous Ion. See Iodides.Phenol Coefficient. See Germicide.Phosgene, Determination of— in Gases from Experimental Firps Ex­

tinguished with Carbon Tetrachloride. W . P. Yant, J. C. Olsen,H. H. Storch, J. B. Littlefield, and Leopold Scheflan...................... 20

Phosphates, Determination of Semi-Microquantities of. N. H. Fur­man and II. M . State..................................................................................... 420

Phosphoric Acids, Mixtures of— for Temperature Baths from 100° to250° C. B. E. Christensen and A. E. K ing................................. 194

Phosphorus, Determination of— in Stainless Steels Using PerchloricAcid. C. D . Susano and J. H. Barnett, Jr................................................ 183

Photoelectric Colorimeter. See Colorimeter.Photometric Determination of Iron in Used Engine Oils. A. R. Res-

corla, E. M. Fry, and F. L. Carnahan............................................ 242Photometric Determination of Silicate in Sea Water. R. J. Robinson

and H. J. Spoor................................................................................................ 455Phthalate Plasticizers. See Plasticizers.Picric Acid. See Sulfur.Pipet for Determining Oil Acidity. W. F. Davidson................................. 483Pipet for Titrating Dark-Colored Liquids in Two Phases. M . M.

Hicks-Bruun and L. W. Claffey.................................................................. 229Pitchblende. See Radium.P l a n t s : # # #

Application of Semi-Micro-Kjeldahl Method to Analysis of— Tissue.W. W. Umbreit and Y. S. Bond............................................................. 276

Determination of Reducing Sugars and Sucrose in— Materials.W. Z. Hassid................................................................................................. 138

Determination of Starch in— Tissues. G. W. Pucher and H. B.Vickery........................................................................................................... 92

Semi-Micromethod for Determining Basic Nitrogen in— Tissues.W . W . Umbreit and P. W. Wilson. . . . . . . ........................................... 361

Spectrographic Microdetermination of Zinc in. A. P. Vanselow andB. M . Laurance. (Correction, 400)...................................................... 240

Plasticity Measurements. See Rubber.Plasticizers, Phthalate, Determination of. F. C. Thames.......................... 418Plastics, Bituminous, Determination of Flow Properties of. R . N.

Traxler................................................................................................................ 185Platinum Metals. See Metals.Portland Cement. See Cement.P o t a s s i u m : , . t

Determination of Small Amounts of— by Silver Cobaltimtrite. R . J.Robinson and G. L. Putnam.................................................................... 211

New Reagent for. I. Qualitative. A. W. Clark and C. O. Willits 209Sensitiveness of Magnesium Uranyl Acetate Reagent to Sodium and.

C. H. Greene................................................................................................. 399Potassium Iodide, Titration of Silver with. Albert Bloom and W . M.

M cN abb............................................................................................................. 107Potentiometric Determination of Mercaptans. M . W . Tamele and

L. B. R yland . .•• •.•............................................ 16Potentiometric Titration. See Titration.Pycnometer, Precision— for Liquids. S. T. Yuster and L. H . Reyer-

son........................................................................................................................ 61Pyrethrins. See Sprays.Pyrethrum Sprays. See Sprays.Pyridine-Bichromate Method. See Mercury.Pyroligneous Liquors, Determination of Formic Acid in. H. D. Weihe

and P. B. Jacobs.........................................................................‘ ...................... • 44Pyrometer, Simple Portable Aradiant Convection. F. T . Barr and

R. F. Berger...................................................................................................... 393

Q U A N T IT A T IV E Analysis, Application of Statistics to. A. A. Benedetti-Pichler............................................................................................. 373

R A D IU M , Determination of— in Carnotite and Pitchblende. L. D.R oberts............................................................................................................... 5

Recording Balance. See Balance. .Reduction-Oxidation Indicators. See Indicators.Refractive Index, Standard Liquids for Microscopic Determination of.

A. H . Kunz and J. Spulnik........................................................................... 485Refractometer, Differential. D. Rau and W . E. Roseveare.......... 72Refractory Crucibles. Preparation of— for Laboratory. P. S. Roller,

D . Rittenberg, ana A. Gabriel. ......................................................... 486Resins, Alkyd, Analysis of. Frederick Kavanagh..................................... 397

(See also Plasticizers.)R h e n i u m :

Detection of— in Sodium Carbonate Bead. Herman Yagoda 133Determination of:

I. Qualitative. L. C. H urd...................................................................... 11II. Geilmann Reaction. L. C. Hurd and B. J. Babler.................. 112

Rodgers Ring Burner. See Burner.Rotenone Determination by Colorimetric Methods. H. D. Rogers

and J. A. Calamari............................................................................................. 135R u b b e r :

Determination of Free Sulfur in. E. W. Oldham, L. M . Baker,and M. W. Cray tor........................................................................................ 41

Determination of Guanidines in— Stocks and Consumption ofGuanidines during Cure. B. J. Humphrey.......................................... 153

Determination of Sulfur in— Compounds. C. H. Lindsly:I. Precipitation of Barium Sulfate in Presence of Picric Acid. . . 176II. Sources of Error in Determination of Free Sulfur in— Com­

pounds Containing Rapid Accelerators and Sulfur-Bearing Accelerators................................................................................................. 179

Impact Cutting Test for Tire Tread Stocks. J. H. D illon............... 68New— Particle Count in Hevea Latex. E. E. Langeland.................... 174Pendulum as Source of Energy for Plasticity Measurements. Ira

Williams............................................................................................................ 304

S A L IC IN , Estimation and Identification of the Glucoside. M . B.Jacobs and N. T . Farinacci................................................................. 279

Saponification Numbers of Asphaltic Petroleum Residues. J. II. Bruun and L. W. Claffey................................................................................. 255

Sea Water. See Water.Sedimentation Apparatus for Determining Particle Size of Insecticidal

Dusts. L. D. Goodhue and C. M . Smith................................................ 469Seil Method. See Sprays.S e l e n i u m :

Copper Chloride-Perchloric Acid Method for Gravimetric Deter­mination of— in Alloy Steel. Louis Silverman................................. 132

Determination of— in 18-8 Stainless Steels. G. G. Marvin withW. C. Schumb............................................................................................... 109

Determination of— in Steel. W. C. Coleman and C. R. McCrosky 196 New Colorimetric Procedure for— Determination. K. W. Franke,

Robert Burris, and R. S . H utton ........................................................... 435Shaking. «See Agitation.Shellac, Fluidity and Hygroscopic Properties of. R . V. Townend and

> W . R. C layton . ................ 108Silica, Determination of— in Boiler Water. M . C. Schwartz (Cor­

; rection)............................................ 323Silicate, Photometric Determination of— in Sea Water. R. J. Robin­

son and H. J. S poor .. ..................................................................................... 455Silicate Rocks, Determination of Chromium, Vanadium, and M olyb­

denum in. E. B. Sandell.............................................................................. 336Silicic Acid, Ignition of. K. A. Krieger and H. S. Lukens...................... 118Silicosis. See Dusts.Silver, Ceric Ammonium Sulfate and Starch as Indicators in— Titra­

tion with Potassium Iodide. Albert Bloom and W. M . M cN abb. . 167Silver Arsenate, Determination of Arsenic in. Austin Pomerantz and

W. M . M cN abb................................................................................................ 466Silver Cobaltinitrite, Determination of Small Amounts of Potassium

by. R. J. Robinson and G. L. Putnam................................................... 211Silver-Copper Alloys, Electroanalysis of. W . L. M iller.......................... 431Siphoning, Device for Determining Rate of— in Metal Extraction

Systems. R . S. Asbury. ........ 152Sodium, Determination of— in High Aluminous Material. H. V.

Churchill, R . W. Bridges, and A. L. M iller............................................ 348Sodium, Sensitiveness of Magnesium Uranyl Acetate Reagent to

Potassium and. C. II. Greene.................................................................... 399Sodium-Ammonia Method. Sec Sulfur.Sodium Carbonate Bead, Detection of Rhenium in. Herman Yagoda 133Sodium Hyposulfite Solutions for Absorption of Oxygen. Dorothy

Q u ig g le ... .............................................................................. . ......................... 363Sodium Thiosulfate, Standardization of— Iodometrically against

Copper. L. O. Hill. . . ............................................................................ 200Soils, Determination of Zinc in. H. M . Boggs and A. O. A lben 97Solubility Determinations, Hill Method for. T. W . Evans................. 206Solvents, Determining Evaporation Rate of— at High Temperatures.

F . C. Thorn and C. Bowman.................................................................... 432S p e c t r o o r a p h i c D e t e r m i n a t i o n s :

Copper in Ores and Mattes. J. P. Mehlig (Correction)...................... 257Detection of Lanthanum, Yttrium, and Ytterbium from Spark in

Flame Spectra. O. § . Plantinga and C. J. R odden........................ 232Fluorescent Light Microscopy. C. J. Frosch and E. A. Hauser. . . 423Microdetermination of Zinc. A. P. Vanselow and B. M . Laurance.

(Correction, 400).............................................................. 240Quantitative Determination of Cadmium and Lead in Zinc. II. M.

Sullivan........................................................................................................... 382Spindle for Insulating Wires. J. M . Sturtevant....................................... 341Spray, Dithizone as Reagent for Dissolving and Determining— Resi­

due Lead. W. E. W hite......................... 231Sprays, Loss of Pyrethrins during Analysis of Mineral Oil-Pyrethrum

Extracts by Seil Method. J. J. T . Graham........................................... 222Stannic Oxide, Separation of— from Various Metallic Oxides by

Ignition with Ammonium Iodide. .E. R . Caley and M. G. Burford 114 Starch, Determination of— in Plant Tissues. G. W. Pucher and H. B.

V ickery .............................................................................................................. 92(See also Silver.)

S t e e l :Alloy, Gravimetric Determination of Selenium in. Louis Silverman 132 Corrosion-Resisting 18-8, Determination of Manganese in. Louis

Silverman.......................................................................................................... 383Determination of Manganese in Tungsten and Ferrotungsten. G. F.

Smith, J. A. McHard, and K. L. Olson ................................... 350Determination of Phosphorus in Stainless— Using Perchloric Acid.

C. D. Susano nnd J. H. Barnett, Jr....................................................... 183Determination of Selenium in. W. C. Coleman and C. R . McCrosky 196 Determining Sulfur in Plain and Alloy— by Combustion Method.

C. II. Hale, Jr., and W. F. Muehlberg.................................................. 31718-8 Stainless, Determination of Selenium in. G. G. Marvin with

W. C. Schumb................................................................................................. 109Modified Persulfate-Arsenite Method for Manganese in. E. B.

Sandell, I. M. Kolthoff, and J. J. Lingane (Correction).................. 73Stills. See Distillation.Stirrer. See Agitation.Strontium, Separation of— , Barium, and Lead from Calcium and

Other Metals. H. H. Willard and E. W . Goodspeed.......................... 4 1 4 -Sucrose. See Sugar.S u g a r :

Apparatus for— and Other Titrations. E. S. W est.................................. 62Apparent and True Solids of— Cane Juice. C. A. Fort and Nelson

M cKaig, Jr...................... ............................................................................. 333Determination of Reducing— and Sucrose in Plant Materials.

W . Z. Hassid................................................................................................. 138Raw Cane, Dextrose-Levulose Ratio and Polarizing Constants of.

F. W. Zerban.............................. 321Semi-Micromethod for Iodometric Determination of Maltose in

Studies of Amylase Action. M. L. Caldwell, S. E. Doebbeling,and S. H. Manian.......................................................................................... 181

Turbidity in— Products. IV. Preparation of Raw— Solutions for Determination of Color and Turbidity. F. W . Zerban and LouisSattler................................................................................................................ 168

S u l f a t e :Barium Chromate Method for Volumetric Determination of— in

Water. M. D . Foster............................................................... 195Determination of— by Titration with Lead Nitrate, Using Eosin as

Indicator. J. E. R icci............................................................ 130Direct Titration of— with Tetrahydroxyquinone as Internal Indi­

cator. R . T. Sheen and H. L. Kahler..................................................... 127S u l f u r :

Accurate Separation of Precipitated Mercuric Sulfide and— in Gravi­metric Determination of Mercury. E. R . Caley and M . G. Bur­ford .................................................................................................................. 43

Combustion Method for Determining— in Plain and Alloy Steels.C. H. Hale, Jr., and W. F. Muehlberg.................................................. 317

Determination of Elementary— in Gasoline and Naphtha. Charles Wirth III and J. R. Strong.......................................................................... 344

■196 INDUSTRIAL AND ENGINEERING CHEMISTRY VOL. 8, NO. 6

Determination of Free— in Rubber. E. W . Oldham, L. M . Baker,and M . W . C raytor.......................... . ....................... 41

Determination of Organic— by Liquid Ammonia-Sodium Method.F. J. Sowa, V. G. Arcadi, and J. A. Nieuwland. ...... 49

Determination of— in Rubber Compounds. C. H. Lindsly: _I. Precipitation of Barium Sulfate m Presence of Picric A c id .. . 176II. Sources of Error in Determination of Free— in Rubber Com­

pounds Containing Rapid Accelerators and— Bearing Accelera­tors.............................................................................................................. 179

Direct Determination of Oxygen in Organic— Compounds. W .W .Russell and M . E. M arks.......................................................................... 453

Free— in Petroleum Distillates. S. C o m a y ... ....................................... 460Surface-Tension Measurements of Viscous Liquids. A. H. Pfund and

E. W . Greenfield.......................................................................................... 81

T E M P E R A T U R E Baths, Inorganic Liquid Mixture for— from 100°to 250° C. B. E. Christensen and A. E. King. . . . %..................... 194

Tetraethyl Ammonium Iodide as Reagent in Microscopical QualitativeAnalysis of Antimony and Bismuth. F. T . Jones and C. W. Mason 428

Tetrahydroxyquinone. See Sulfates.Thermionic Titrimeter. See Titrimeter.Thermoregulator, Adjustable Sensitive. J. Y . Yee and R . 0 . E. Davis 477Thermoregulator, Sensitive. L. D . Goodhue............. ... ........................... 387Thermostat, Versatile Low-Temperature. G. B. lleisig ........................ 149Tin. See Electrolysis.Tires. See Rubber.Titanium, Rapid Method for Determining, H. B. Hope, R. F. Moran,

and A. O. Ploetz............... .••••............................................................... 48Titanium Titration. See Titration.T i t r a t i o n : .

Action of 4-Nitrocatechol as— Indicator. S. R . Cooper and V. J.Tulane............................................................................................................. 210

Alkali, New Buret for. L. S. Keyser................................................ 121Apparatus for Sugar and Other. E. S. W est ............................ 62Chloride Ion with Mercuric Nitrate Solutions. Irving R oberts. . . . 365Determination of Iron by Titanium— and by a.a'-Bipyridine

Colorimetry. W. D. McFarlane...................................._............. .. . . . 124Determination of Sulfate by— with Lead Nitrate, Using Eosin as

Indicator. J. E. R icci....................................................................... 130Direct— of Sulfates with Tetrahydroxyquinone as Internal Indi­

cator. R . T. Sheen and H. L. K ahler.. . .................................... 127Pipet for Titrating Dark-Colored Liquids in Two Phases. M . M.

Hicks-Bruun and L. W . Claffey..................................................... 229Potentiometrie, New Buret for. L. S. Keyser................................ 82Potentiometrie— of Acidity in Insulating Oil Using Glass Electrode

in 7i-Butanol. R . N. Evans and J. E. Davenport..................... 287Silver with Potassium Iodide. Albert Bloom and W. M. M cN abb. 167

Titrimeter, Thermionic— without Batteries. H. H. Willard and O. B.Hager, Jr. (Correction, 180)................................................................ 144

Tom ato Juice, Buffer Capacity of. Margarethe Oakley and J. C.Krantz, Jr................................................................................................... 205

Tubing. See Copper.Tung Oil. See Oils.Tungsten, Determination of Manganese in Ferrotungsten and. G. F.

Smith, J. A. M cHard, and K. L. Olson............................................. 350Turbidity. See Sugar Products.

V A L V E , Check— for Wash Bottles. F. H. Smith............................ 400Valve. Sensitive Check. E. L. Green.................................................... 40Vanadium in Silicate Rocks. See Silicate Rocks.

Vapor Pressure Apparatus, Variable Vapor-Volume Barometric Typeof. E. M . Barber and A. V. Ritchie.................................. 472

Vaporimetrio Determination, Micro— of Molecular Weight. J. B.Niederl, O. R. Trautz, and A. A. P len tl................................................... 252

Viscometers, Concentric Cylinder, Extending Useful Range of. Lom­bard Squires and R. L. Dockenclorff. . . .................................................. 295

Viscometers, Suspended-Level, Modification of. E . H . Payne andC. C. M iller................................................................................................... 300

Viscous Liquids. Sec Liquids.Vitamin D Units, Energy Equivalents of. R . W . Haman and

Harry Steenbock............................................................... 291Volumetric Determinations, Calculating the Blank in. Bartholow

Park.............................................................................................................. 32

W A SH Bottles, Check Valve for. F. H. Smith.............................. 400W a t e r :

Analysis. Simplification of Isohydric Indicator Method. SverreStene......................................................................................................... 398

Barium Chromate Method for Volumetric Determination of Sulfatein. M . D. Foster................................................................................. 195

Boiler, Determination of Silica in. M . C. Schwartz (Correction). . . 323Glass Head for Laboratory— Still. P. F. Sharp and E. B. Struble. 316New Moisture Tube. H. B. Alexander................................................... 314Sea, Determination of Iron in. N. W. Rakestraw, H. E. Mahncke,

and E. F. Beach...................................... .................................................... 136Sea, Photometric Determination of Silicate in. R . J. Robinson

and H. J. Spoor..................................................................................... 455Wear, Accelerated Method for Determining— Caused by Abrasion.

F. D. Snell and K. W . Haeseler............................................................ 191Weighing, Errors in Micro— Due to Use of Lead Shot in Tares. R. J.

Williams....................................................................................................... 229Willard and Winter Method. See Fluorine.Wine, Methods of Analyzing. C. H. McCharles and G . A. Pitman. . 55Winter and Willard Method. See Fluorine.Wires, Insulating, Spindle for. J. M. Sturtcvant..................... .... ........... 341W ood, Composition of Middle Lamella of Lignin in Douglas Fir. A. J.

B a i l e y . . . . . . ..................... >........................ 52W ood, Lignin in Douglas Fir. A . J. Bailey................................................ 389

X -R A Y Diffraction M ethod for Quantitative Analysis of Mine Dusts.G. L. Clark and D. H. Reynolds................................................................ 36

X-Rays, Identification of Crystalline Materials by— Diffraction Pat­terns. J. D . Hanawalt and H. W. R inn................................................ 244

Y T T E R B IU M , Detection of Lanthanum, Yttrium, and— from Sparkin Flame Spectra. O. S. Plantinga and C. J. R odden........................ 232

Yttrium. See preceding item,

Z IN C :Determination of— in Soils. H. M . Boggs and A. O. A lben............... 97Pigments in Paper Affect a-Cellulose, Copper Number, and Acidity

Tests ..................................................... 62Quantitative Determination of Cadmium and Lead in. H . M.

Sullivan...................... 382Quantitative Separation and Determination of Aluminum and.

F. H. Fish and J. M . Smith, Jr. (Correction. 477)......................... 349Spectrographic Microdetermination of. A . P. Vanselow and B. M.

Laurance. (Correction, 400)................................................................... 240