THIS

UNIMATTHE IDEAL MINIATURE MACHINESHOP FOR RESEARCH LABS

AND MODEL SHOPSMULTI-FUNCTION PRECISION MACHINETOOL OCCUPIES NO MORE SPACE THAN A

TYPEWRITER Engineers and Designers sup.plement their sketches and blueprints withmachined-to-scale models anybody can "read".Technicians in research labs turn out machinework with amazingly small tolerances, downto .0004-of-an-inch! Manufacturers developingnew products find UNIMAT indispensable inthe mock-up shop. Hundreds t of efficiency-minded companies, hospitals and governmentagencies are now putting their UNIMATS toa thousand-and-one uses ... it's the practicalmachine for making small parts! Let us tellyou how they can serve you.

* BASIC UNIMAT includes motor, lathe and cornponents for converting to drill press, tool and surfacegrinding machine, and polisher-grinder. Low-cosiattachments: jig saw, threader, circular saw,indexer-divider. Plus complete range of machimaccessories.

tTO MENTION A FEW:Atom Products Division of GE, U.S. Naval Research,BeU Telephone Laboratories, Westinghouse, Pratt &Whitney, Raytheon, NYU-BeUevue Medical Center,Smithsonian Institute, General Motors.

Write for illustrated literature and price list

AMERICAN-EDELSTAAL/UNIMAT DIVISIONDEPT. AI, 350 BROADWAY, NEWYORK 13, N.Y.

18 SEPTEMBER 1959

New ProductsThe information reported here is obtained

from manufacturers and from other sources con-sidered to be reliable, and it reflects the claims ofthe manufacturer or other source. Neither Sciencenor the writer assumes responsibility for the accu-racy of the information. A coupon for use in mak-ing inquiries concerning the items listed is in-cluded in the postcard insert.

M BORANE DETECTOR monitors airborneborane in concentrations less than 10parts per billion. The detector cell con-tained in the instrument's sampling headconsists of a pyridine-pyridinium chlo-ride scrubber containing iodide and a

small amount of iodine. Iodine is re-duced to iodide by the boranes. Whenthe iodine concentration drops to a pre-set level detected by amperometric elec-trodes regeneration is initiated by gen-erating electrodes through a meter relay.The number of iodine-forming cycles inunit time is a function of borane con-

centration. Indication is provided eitherby a digital counter or by a potentiom-eter recorder. (Mine Safety ApplicancesCo., Dept. 40)

* ULTRASONIC DELAY LINES claim 20 per-cent reduction in diameter and 40 per-cent reduction in weight of fused quartzrequired. The center frequency of a

1500-[tsec line of the series is 32 Mcy/sec, with bandwidth for 3-db responseof 20 Mcy/sec. Maximum secondarylevel in 5 Mcy/sec about the centerfrequency is 43 db. Ripple in the passband is ± 0.25 db. (Arenberg UltrasonicLaboratories, Inc., Dept. 43)

* GAS AND VAPOR DETECTOR, KitagawaUnico model 400, consists of a handpump and detector tubes for specificgases and vapors. The pump is designedto draw air samples at a reproduciblefixed rate that duplicates flow conditionsused in calibration. Reagents are ad-sorbed on fine-grain silica gel hermeti-cally sealed in the glass detector tubes.Average error is said to be less than ± 5percent at 680F. Temperature correc-tion tables are available. Thirty-six typesof detectors are available for variousgases in various concentration ranges.(Union Industrial Equipment Corp.,Dept. 46)

* TIME-CODE GENERATOR is an electronicclock supplying coded output signals.The base carrier signal is a 100 cy/secsine wave from which interpolation to± 0.0025 sec is said to be possible. In-tervals of 0.2, 1, 10, and 60 sec are

marked uniquely. Time announcementsare made in decimal form every minutein 24-hour time. The instrument clockis a crystal oscillator stable to ± 3 in107/wk. Readout is an in-line, in-planevisual display. Start time may be pre-set to Greenwich Mean Time or otherbases by a series of switches and may be

-Schonigerco bustionapparatus

0

0

0

0

0

0 V,

for determination of halogens,suffur, traces of metals, etc.,

in organic materialsA simplified technique for catalytic com-bustion of organic materials in oxygen.The procedure converts organic materialsinto soluble combustion products whichare then analyzed by usual inorganicgravimetric or volumetric methods.

Consisting of a heavy wall flask, of boro-silicate glass, with ground glass stopper withattached platinum wire gauze sample carrierand specially cut low ash paper sheets whichserve as sample holders.

In use, sample is placed in the platinumcarrier and the flask is charged with a smallamount of absorbing liquid and with free-flowing oxygen. The paper is ignited; stopperwith sample is seated in the flask and flaskinverted at an angle. Combustion proceedsat high temperatures and combustion prod-ucts are absorbed in the liquid. Titrations canthen be made directly in the flask.

Results compare favorably, i.e., within0.3%, with conventional methods. Because

of low cost, time and space saving features,the method is finding wide use for many sub-stances which undergo complete combustion

See Wolfgang Schoniger, MikrochimicaActa, 1956, Heft 1-6, pp. 869-876.

64704E. Combustion Apparatus, Thomas-Schbnlger (Schbnlger Flask), as above described,300 ml capacity, for samples up to 10 mg. .... 28.356470-0. Ditto, as above but with 500 ml flask, forsamples up to 100 mg ...................... 29.00

ARTHUR H. THOMAS CO.Laboratory Apparatus

and ReagentsVINE ST. AT THIRD

PHILADELPHIA 5, PA.More aWd more tboraboriss RELY ON THOMAS

741

SAMPLE PGNITION1sj SAMPLE IN

PAPER INHOLDER

PLATINUM

ABSORPTION

SAMPLE STOPPER WITHWRAPPED IN W GROUND JOINTPAPER HOLDER

1111111111111111111

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activated manually or automatically bya WWV signal. Connection for a WWVreceiver is provided as well as built-inWWV propagation delays from 0 to 99msec. (Beckman Instruments, Dept. 57)

*ANGLE INDICATOR is a servo system fordigital indication of angular position.The instrument is said to be repeatablewithin 0.6 min in either direction andaccurate within ± 6 min. Rotation is con-tinuous, and slewing speed is 180 degin 14 sec. Operation is on 400 cy/sec,115-v power. (Kearfoot Company, Dept.59)

* CIRCUIT ANALYZER automatically per-forms three terminal measurements ofcomplex impedances. Additional meas-urements of insulation resistance, diodeforward voltage drop, and diode reverseresistance are also provided. A papertape is used to program the analyzer,permitting the user to select test points,type of test, and tolerance limits. Print-out is provided when tolerance limits areexceeded. The input accepts a maxi-mum of 300 test points. Test signal fre-quency is 1591.5 cy/sec. Resistancerange is 1.00 ohm to 100 megohm; ca-pacitance 10.0 pf to 1000 [if; inductance

MICROSAMPLINGFOR BOTH POTASSIUM & SODIUM

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Years of technical and practical experience, andthorough field testing in laboratories of world-famous hospitals have enabled Baird-Atomic toproduce the finest Flame Photometer for clini-cal work on the market today.

Write today for BulletinF701 with full technical in-formation on B/A's NEWFlame Photometer Model KY,to:

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As little as .05cc of serum is needed foraccurate Potassium and Sodium determi-nationsStable Internal Lithium Standard guar-antees dependable, consistent resultsFast, direct-reading in Meq/liters . . .eliminates tedious calculationsOutside contaminants and thermal drifteliminated by special sealed constructionAdaptable to all laboratory or clinicalsituations ... Compact, rugged, portable.

10.0 gh to 1000 h. Tolerance limits areadjustable from ± 1 to ±50 percent ineight steps. Testing rate depends on thetype of measurement; the minimum rateis two tests per second. (Brooks Re-search Inc., Dept. 53)

M GAS CHROMATOGRAPHY COLUMN DE-

TECTOR, combining a Golay column, anionization detector, and accompanyingamplifier, is available as an integral partof chromatographic equipment or as anaccessory for earlier instruments. Twotypes of detectors are available. In onethe column effluent is ionized thermallyin a hydrogen flame; in the other, ioni-zation is produced by beta rays from aKr85 source. The beta-ray unit is said toprovide detectability in the range of10-14 mole of sample in carrier gas, theflame detector somewhat greater detect-ability. Electrical response time is 1 msecfor either type. Effective volume of theflame detector is 1 to 3 mm3, of thebeta-ray device 5 mm3. Power suppliesare line operated and include 300-v po-larizing batteries. (Perkin-Elmer Corp.,Dept. 56)

* CONTROLLED-ATMOSPHERE CHAMBER

provides atmospheres with contamina-tion less than 1 part per million byevacuation to less than 1 x 10-4 mm-Hgbefore introduction of the desired gas.Pressure of 5 x 10-4 mm-Hg is reachedwithin 20 min. The unit is made ofstainless steel, with a transparent plasticdome. (Scientific Engineering Labora-tories, Dept. 48)

* HYDROGEN AND CARBON ANALYZER

uses a P-ray absorption system to deter-mine hydrogen or hydrogen-carbon ra-tios in hydrocarbons. Strontium-90 isthe source. Operation depends on thehigh electron density in hydrogen ascompared with that in other elements.Individual determinations can be madein about 15 min with statistical probableerror ± 0.03 weight percent hydrogen.(Central Scientific Co., Dept. 52)

M STRAIN-GAGE AMPLIFIER measures 3.87by 1.87 by 1.16 in. Operation is from a28-v (nominal) d-c source. Output is 0to 5 v d-c. Frequency response is 0 to2000 cy/sec. Ambient temperature rangeis - 650 to + 1650F. Vibration of 35 gand shock of 100 g are tolerated.(Statham Instruments, Inc., Dept. 55)

* LEAK DETECTOR uses halogenated gas asthe probing gas and detects the inleak-ing gas by change of color of a flame.The detector flame burns at a smallorifice in a red-hot copper block. In thepresence of halogen, the otherwise color-less flame becomes bright blue-green.The detecting unit, consisting of thecopper-block burner, a flame shield, anda gas probe, screws on to standard blow-

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LABLINE . .

the most directline to qualityand value...

IMPERIAL CENTRIFUGEModel 10, Size 1 ......... $690.00The most advanced performance. Features

exclusive Keyboard Control Center, built-insafeties, electric brake, bearings grease-sealed, lubricated for life; backed by 50years of experience building centrifuges.Other models available.

NE ENVIRON-CAB.I3960R 10cu.ft.. $3300.00It by pioneers in the development ofnmental test equipment. Variableratures and humidities. Completelybled, ready for use. Other modelsble.

real test of any laboratoryluct is how it performs on theLabline products embody theacquired through years of

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ubsidiaries: Hudson Bay Co.icago Surgical & Electrical Co.

torch flasks of propane. To hunt leaksin vacuum systems, the probe is con-nected to the vacuum-pump exhaust,and the system is sprayed with halogen-containing gas or suspected areas arepainted with a volatile halogen com-pound. As little as 5 to 10 parts per mil-lion of halogen is said to be detectable.(Fisher Scientific Co., Dept. 63)

M COUNT AND TIME SCALER combines adecimal count scaler with an electronictime scaler. Preset time to 1000 sec, orpreset count to 107, is measured. Resolv-ing time is 1 gsec. The instrument in-cludes a full-range discriminator fixedmercury pulse generator, and an elec-trically reset four-digit register. Positiveor negative input is accepted. (Radia-tion Instrument Development Labora-tory, Inc., Dept. 62)

* VACUUM-TUBE VOLTMETER measuresvoltage between 100 tv and 1000 v, 1mv full-scale, with accuracy ± 1 percentof full scale. Current is measured from0.1 ita to 1 amp with accuracy + 2 per-cent of full scale. Resistance can bemeasured from 0.02 ohm to 5000 meg-ohm. Voltage gain of the meter ampli-fier is 1000. Input is floating, with inputresistance ranging from 10 megohm onthe 1 mv range to 200 megohm onranges above 100 v. The ohmmeter is amodified Kelvin bridge. (Hewlett-Pack-ard Co., Dept. 58)

*OSCILLOGRAPH is a two-channel, direct-writing recording milliameter that useselectric or ink writing in rectilinear co-ordinates. Acoustic damping of the re-corder movement is 50 percent of criti-cal from current source drive. Sourceimpedance for critical damping is 200ohm. Constant-current response charac-teristic is flat from d-c to 60 cy/sec,falling off at the rate of 12 db/octavefrom 60 to 200 cy/sec. Current sensi-tivity is approximately 2.5 ma/mm.Linearity is 2 percent of 20 mm full-scale. (Cohu Electronics, Inc., Dept. 61)

* CONDUCTIVITY CELL is designed for useat temperatures up to 200'C and pres-sures up to 300 lb/in.2 (gage). Cell con-stant can be changed ± 10 percent, per-mitting calibration while the cell is atworking temperature and pressure. A re-movable shield protects the electrodesfrom direct impingement of flowingliquid. Trapping of gas bubbles is pre-vented by design of the cell; the cellmay be operated in any position. (In-dustrial Instruments, Inc., Dept. 60)

* MULTIPLIER PHOTOTUBE is designed forhigh resolution in scintillation countingand nuclear-radiation spectrography.Transit-time differences under typicaloperating conditions are kept down to0.3 mgsec. Width of the output pulse can

A

-~~~~~~~~~~~~~~1

TRANSFORMER

Here is the original "do-it-yourself" transformer.

This portable, self-contained toroidal primary coil

eliminates the task of obtaining the right trans-

former for each new job simply wind your

own! Especially useful when high amperage at low

voltage is required. Used to demonstrate basic

transformer principles serve as working lab

equipment. The primary consists of a silicon steel

core having a coil of 400 turns of copper wire.

Completely enclosed in durable, high-impact plas-

tic with integral SUPERIOR 5-WAY binding posts

for making connections. Versatile laboratory, shop,

classroom and inspection aid.

A SOURCE OF A-C VOLTAGE

FLEXIFORMER type TP150 has an input rating of 120volts, 50/60 cycles single phase and an output ratingof 150 VA. The voltage of the secondary is proportionalto the number of turns hand wound through the centeropening. The correct number of turns is determined bydividing the desired output voltage (plus approximately25%) by 0.3 which is the volt/turn ratio of theFLEXIFORMER.

A CURRENT TRANSFORMER

400 AMP WaE50/60 cYCLfLike

FLEXIFORMER type TP150 becomes the secondary wind-ing when used as a current transformer. A current car-rying conductor passing through the center openingserves as the primary. When used with a 0-1 ampereammeter, currents up to 400 amperes can be measuredwith an accuracy of 1% at 60 cycles. Can be used asportable units or fastered permanently in place.

WRITE FOR FLEXIFORMER BULLETIN

0

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* LABLII* Model* Built* envirot0 temper

assemb* availal00* The* prods* job.* skills

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74* SCIENCE, VOL. 130

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be as little as 2 mgsec at half height withrise time of the same duration. Peakanode current is 1 amp, which is suffi-cient for direct use without amplifica-tion. At values up to 300 ma, anode cur-

rent varies linearly with incident lightflux. Fourteen multiplier stages providegain of 108 or more, corresponding to an

average cathode sensitivity of 50 [ta/lu.Maximum useful diameter is 42 mm.

Peak spectral response is 4200 ± 300 A.(Mullard Ltd., Dept. 64)

* ULTRAVIOLET ANALYZER, for automaticlocation of protein and nucleic-acid frac-tions eluted by column chromatography,monitors continuously during fractioncollecting and records the ultraviolet ab-sorbing qualities of each collection tube.Transfer from one sample tube to thenext is indicated by a pip on the strip-chart record. The system is electricallystabilized by a servo-driven self-nullingcircuit that balances out line and lightfluctuations and compensates for base-line changes resulting from the solventsused. Optical densities as small as 0.03are recorded. Cuvettes are optical quartzof capacity 1.1 ml. (Canal IndustrialCorp., Dept. 65)

* DELAY LINES of magnetostrictive designare said to have temperature coefficientsof 5 x 10-/OC for fixed lines and forsome adjustable models, and 25 x

10-6/0C for other adjustable models.Delay stability ± 0.05 percent from - 60°to + 90'C can be provided. Output am-

plitude is constant over the entire oper-

ating range. (Deltime Inc., Dept. 66)

* SCANNING PRINTER has 12-digit decod-ing and printing capacity for electroni-cally controlled data from decimal or

binary-coded decimal sources. A 12-column input keyboard provides formanual insertion of data. Input resist-ance of the data-input circuits is greaterthan 1 megohm, so that power drawnfrom data-originating circuits is small.(Clary Corporation, Dept. 68)

* SPEECH COMPRESSOR-EXPANDER speeds

speech to twice normal rate in nine stepsor slows speech to one-third normal ratein nine steps while retaining intelligibil-ity. Sensitivity for full-scale operationis 0.1 v r.m.s. Input signal recommendedis 0.2 v r.m.s. Input impedance is 600ohm. Frequency response is + 2.0 db,500 to 8000 cy/sec. Power supply is self-contained. (Kay Electric Co., Dept. 71)

* ANALOG-TO-DIGITAL RECORDER recordsanalog values of shaft rotation input inbinary-decimal, punched-tape form. Thetape accommodates 16 binary digits,equivalent to four decimal digits. Thetape can be read directly or can be trans-lated automatically into standard com-

puter tape or punched cards. In addi-

18 SEPTEMBER 1959

DURALABLABORATORY FURNITURE AND EQUIPMENTMANUFACTURERS & "LABS AC

DESIGNERS OF THAT LA Complete Line of Superior Quality Spcats in the design and manu-

* TABLES * CABINETS facur of laboratory furniture andFUMEHOODS a~~~equpmnt, Duralab's- Standard, Sec-

* CASES * FUME HOODS tional asid Custom Built units are:

* RADIO CHEM. LAB. EQUIP. Fireproof, Waterproof, Corrosion Re-sistant.

S.. our catulog in SweeutArchitectural File 23L

Du

* For Catalog D2 illustratingour complete line of Labora-tory Furniture and Equipment,write today

FUME HOOD model HSVAEH-106 (illustrated) has been de-velped for the Radio Chemicallaboratory. Write for full spe-

cifications.

e* A copy of our completeFume Hood Catalog DH3 Isyours on request. Write today.

Visit our booths #1245, 1247, 1249at the 27th Exposition of ChemicalIndustries, Coliseum, New York City,

Nov. 30-Dec. 4, 1959

IDIIDAIAD EQUIPMENT CAR 980 LINWOOD STREETEQUIPMENT CORP, BROOKLYN 8, N. Y.

flew.....EVInCIRC 0THERM OVEN

Temperaturesto 250` C. (4800 F.)

Improved Temperature Uni-formity. With Hevi-Duty's "circle-

of heat" design, there are no coldcorners.

Fast Heat-Up. To 2000 C. in lessthan one hour. coated on bcLow-Cost Operation on either 115 rosion.or 230 volts. Selector switch permits Accurate I

high or low input to enclosed heat- by sensitiveing elements. permits littlDurable Double-Wall Construc. For compleltion. Steel outer shell is prime Bulletin 454

Ath sides to prevent cor-

Femperature Controle bulb-type thermostatle lag or overshoot.te information, write for8.

NEVl-DUTYIBPA DIVISION OF C BASIC PRODUCTS CORPORATION

HEVI-DUTY ELECTRIC COMPANY, MILWAUKEE 1, WISCONSINIndustrial Furnaces and Ovens, Electric and Fuel * Laboratory Furnaces * Dry Type Transformers * Constant Current Regulators

745

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tion to the punched-tape output, thedevice supplies digital information inthe form of electrical contact closuresthat may be used for telemetering.(Fischer & Porter Co., Dept. 72)

* INDICATOR AND RECORDER is a servo-operated device that provides digitalread-out of electrical signals producedby transducers while simultaneously re-cording on a 3-in. strip chart. Chartdrive is synchronous. Digital read-outaccuracy is said to be ± 0.1 percent,chart accuracy ± 1 percent. (Gilmore In-dustries, Inc., Dept. 67)

* INERTIA SWITCH is sensitive to accelera-tion axially, radially, or omnidirection-ally from 0.01 to 500 g. Accuracy is saidto be ± 0.1 percent, repeatability ± 0.003percent. Automatic reset is optional withclosure time variable, and adjustable ac-celeration setting can be provided.Weight is about 1 oz. (Safe Lighting,Inc., Dept. 73)

* SUB-AUDIO TUNED AMPLIFIER is con-

tinuously adjustable from 0.3 to 3000cy/sec. Attenuation of second harmonicis greater than 35 db, of third harmonicgreater than 45 db, of higher harmonics,

INSTRUMENTSEQUIPMENTGLASSWARECHEMICALS

Harshaw stocks many thou-sands of items-from corksto electron microscopesobtained from over 800 manu-facturers in all parts of thecountry. We would welcomean opportunity to serve you.

HARSHAW SCIENTIFICDivision of The Harshaw Chemical Company

Cleveland 6, Ohio

BRANCHESCLEVELAND 6, OHIO CINCINNATI 13, OHIO DETROIT 28, MICH. HOUSTON 11, TEXAS1945 East 97th Street 6265 Wiehe Rd. 9240 Hubbell Avenue 6622 Supply RowTel. VUlcan 3-2424 Tel. REdwood 1-9100 Tel. VErmont 6-6300 Tel. WAlnut 3-1627

LOS ANGELES 22, CALIF.3237 So. Garfield Ave.Tel. RAymond 3-3161

OAKLAND 1, CALIF.5321 E. 8th St.Tel. KEllog 3-9169

PHILADELPHIA 48, PA.Jackson & Swanson Sts.Tel. HOward 2-4700

SALES OFFICESAMARILLO, TEXAS, 3409 S. Jackson Street, Tel. DRake 4-9948 * ATLANTA 5, GEORGIA, 3130 Maple Drive, N.E.,Tel. CEdar 7-1626 * BATON ROUGE 6, LOUISIANA, 3160 Florida St., Doherty Bldg, Room 103, Tel. Dickens 3-1933BUFFALO 2, N. Y., 260 Delaware Avenue, Tel. GArfleld 9200 * HASTINGS-ON-HUDSON 6, NEW YORK,

Tel. LOrraine 2-6250 . PITTSBURGH 22, PENNSYLVANIA, 505 Bessemer Building, Tel. ATlantIc 1-6668

746

50 db. Input impedance is 10 megohmshunted by 25 Otaf. Output impedance isapproximately 300 ohm. Amplificationat the center frequency is approximatelyunity. (Electronics Lab., Inc., Dept. 74)

* ULTRAMICROTOME produces automati-cally sections 75 to 400 A for study withelectron microscopes. Single sections 1to 10 [t thick for optical microscopy canalso be prepared. Specimen advance, ac-tuated by thermal expansion of twonickel cores, is controlled by varyingcurrent through the coils surrounding thecores. Current is applied only during thereturn stroke of the mechanism. Theeffect of the current, in addition to heat-ing, is to produce magnetostriction ofthe cores. The magnetostrictive contrac-tion of the cores retracts the specimenso that it does not contact the knife onthe return sroke. Cutting rate is approxi-mately 30 sections per minute. (PhilipsElectronics, Inc., Dept. 84)

M OSCILLOGRAM AMPLITUDE TABULATORconsists of a stationery unit, a printingcounter, and a hand-held rectangularframe with two hairlines. One hairline isfixed; the other can be moved in eitherdirection at fast or slow speed with acontrol knob. The instrument reads os-cillogram and strip-chart amplitudes upto 6.5 in. and prints this information onadding-machine tape. A sequential countis recorded for each reading. Amplitudereading and timing count are directlyvisible on the counter. (Gerber ScientificInstrument Co., Dept. 76)

*POWER SUPPLY for driving tape-re-corder motors is available for operationfrom either 24 to 28 v d-c or 105 to 125v, 48 to 62 cy/sec a-c. Output is 100 wwith frequency regulation + 0.02 percent.Third harmonic content is said to benegligible. (Precision Instrument Co.,Dept. 80)

* MECHANICAL FORCE AMPLIFIER is a me-

chanical servomechanism for amplifica-tion of small forces. Actuation requiresless than 1 g; and output force can beas much as 500 g. The device uses a ringfriction-driven by a roller. Input motionis applied to a control yoke that tilts thering. The tilt causes the ring rotated bythe roller to move laterally along theroller. Lateral motion of the ring is im-parted to a follower which transmits theoutput force. Maximum force is devel-oped at the null position. Time for full-scale travel of 2 in. depends on the angleof tilt and the rotational speed of thedriver. At 300 rev/min the time rangesfrom 0.8 sec for 15-deg (max) tilt to6.1 sec for 2-deg tilt. (American MeterCo., Dept. 81)

JOSHUA STERNNational Bureau of Standards,Washington, D.C.

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New ProductsJOSHUA STERN

DOI: 10.1126/science.130.3377.741 (3377), 741-746.130Science 

ARTICLE TOOLS http://science.sciencemag.org/content/130/3377/741.citation

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is a registered trademark of AAAS.Scienceof Science, 1200 New York Avenue NW, Washington, DC 20005. The title (print ISSN 0036-8075; online ISSN 1095-9203) is published by the American Association for the AdvancementScience

Science. No claim to original U.S. Government Works.Copyright © 1959 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of

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