JuNE 2, 1944 SCIENCE-ADVERTISEMENTS

Anatomy |

* MORRIS'-10th EditionTextbook oF Human Anatomy

Written by Several Anatomists, each a specialist in his branch. Edited by J. PARSONSSCHAEFFER, Jefferson Medical College.

"This edition not only lives up to its predecessors but surpasses them. The subject is presentedin a most complete fashion and meets every demand for a thorough work of anatomy. . . . De-velopmental anatomy finds a prominent place in Section I and is referred to time and againthroughout the text. The anglicized BNA has been followed, however, references to othernomenclatures have not been neglected. . . . It is refreshing to pick up this didactic, time-hon-ored textbook of anatomy and find that it embraces clinical examples as a means of emphasizingpoints. . . . The book will continue to be a standard for a long time to come. "'-Journal of theInternational College of Surgeons.

1155 Illus., Mostly in Colors. 1641 Pages. $12.00 (1942)

* KRIEG'Functional Neuroanatomy

By W. J. S. KRIEG, New York University School of Medicine.

"The author and publisher have combined to make this a remarkable contribution to the teach-ing of neuroanatomy. The material is presented from the point of view of function rather thanof topography. Wherever possible, especially in the case of the sensory elements, systems aredealt with in their entirety, from origin to final termination. The higher motor levels are dis-cussed under the headings pyramidal, extra-pyramidal, autonomic, etc. The chapters on theBrain stem are systematized on the basis of the cranial nerves, and the work is completed byspecial chapters on the cortex, rhinencephalon and cerebellum. The book is lavishly illustratedwith extraordinarily beautiful drawings and diagrams, nearly all of which were prepared by theauthor himself. The usefulness of the book as a teaching aid is greatly extended by the addi-tion of an excellent laboratory manual. In this, the student is directed, system by system, toprocedures calculated to aid in his acquisition of the factual material on which the subject isbased. "-Archives of Neurology and Psychology.

274 Illus. 553 Pages. $6.50 (1942)

* BREMER-WEATHERFORD'Textbook oF Histology

(Sixth Edition of Lewis and Stohr)Rewritten by HAROLD L. WEATHERFORD, Harvard University.Letters from teachers regarding the new edition:

"The impressive quality of this book is its clarity and simplicity of style in which both Bremerand Weatherford have achieved an outstanding success . . . we are particularly pleased by thetreatment of histology from the developmental point of view . . the inclusion of the sectionson the shapes of cells by Dr. Lewis and on the placenta by Dr. Wislocki is excellent . . . themany new illustrations greatly improve the text, in fact, all the illustrations have unusual teach-ing value."

598 Mus. 723 Pages. $7.00 (1944)

THE BLAKISTON COMPANY, ,Phildelphia

9

k

SCIENCE-SUPPLEMENT

SCIENCE NEWSScience Service, Washington, D. C.

THE CYCLOTRON OF THE CARNEGIEINSTITUTION

SCIENCE has a new tool with which to probe the myster-ies of the atom. It is the new giant cyclotron, or atom-smasher, just put into operation at the Department ofTerrestrial Magnetism of the Carnegie Institution ofWashington. The new cyclotron, one of the two largestin operation in the world, the other being at Berkeley,Calif., generates atom-smashing projectiles of 15,000,000electron volts energy, permitting the most precise mea-surements ever made of the forces released by atomicdisintegration.The cyclotron itself weighs more than 225 tons, has an

overall height of 12 feet, is 30 feet long and 20 feet wide.It took four years to build, at a total cost of $500,000for the cyclotron, its appurtenances, and the special three-story building housing the equipment and instrumentshop.The magnet is made up of four iron castings, the largest

weighing more than 50 tons. Surrounded by this heavymagnet is the accelerating chamber, about 60 inches indiameter, in which atomic particles are produced. In thisaccelerating chamber, the atomic particles receive suc-cessive " kicks " which cause them to whirl around incontinually widening circles at tremendous speeds, untilfinally they reach a window on the side of the chamber,where scientists place any element they wish to bombard.Here the element receives the full force of the atom-smashing beam of atomic particles.The Carnegie cyclotron is housed ten feet beneath the

earth's surface, to prevent the radiation from reachingpeople outside. Mice, exposed to cyclotron radiations, ofmuch less intensity than those created by the new atom-smasher, died in a few hours.The new cyclotron, patterned along the same lines as

20 other similar instruments in the United States, isoperated by Dean B. Cowie, physicist in charge. He sitsat the control board, a huge organ-like console, manyyards away from the cyclotron itself, and protected fromits radiations by specially constructed insulating walls.Before him are seven main switches, over 100 smallerswitches, and a maze of dials and meters. Only by press-ing the right switches, in the right order, can he make thecyclotron operate. This interlocking system of controlledoperation protects the equipment from accidentally beingdamaged by mistakes in operation, or by failure of anycomponent of the cyclotron. Because of the dangerousradiations, and the high-voltage equipment in the cyclo-tron laboratory, no one ever sees the cyclotron in opera-tion. To prevent accidents, should anyone be in thelaboratory while the power is on, master switches on doorsleading to the powerful high-voltage parts of the labora-tory automatically cut off all power when these doorsare opened.The Carnegie cyclotron, with its 100 kilowatt radio fre-

quency supply, operates at a frequency of 10 megacycleswhich changes the polarity of the electrodes 10 milliontimes -a second.

The cyclotron was the invention of Professor E. 0.Lawrence, of the University of California, who receivedthe Nobel Prize for its development. At the present timehe is working on the most powerful cyclotron in the world,more than three times greater than the present 60-inchinstrument. Dr. M. A. Tuve, Dr. L. R. Hafstad, Dr. R.B. Roberts, Dr. G. K. Green and Dr. P. A. Abelson, ofthe Department of Terrestrial Magnetism, integrated pastexperiences at other laboratories in this country, withimprovements. With the beginning of the war, all thesemen were assigned to other, more immediately urgent wardevelopments and since then Mr. Cowie has carried theresponsibility of completion of the cyclotron.

ITEMS

INCREASED use of mineral oil may have serious nutri-tional consequences. Non-rationed mineral oil robs thebody of at least two of the fat-soluble vitamins, and ofcalcium and phosphorus, according to the U. S. De-partment of Agriculture. Mineral oil, which has beenplentiful and relatively cheap as well as not becomingrancid, has been used in increasing amounts in saladdressings and in such foods as salted nuts, potato chipsand doughnuts. Its prolonged use, however, may lead todeficiency ills because it prevents the body from makingfull use of some of the most important essentials in food.Recent studies at the Arizona Station showed that mineraloil not only cheated the user of vitamin A, but also ofvitamin D, the "sunshine vitamin," and calcium andphosphorus. Rats taking mineral oil needed three timesas much cod liver oil to supply vitamin D as those notgiven the oil. Puppies fed mineral oil could not use thecalcium and phosphorus in their food to build normalbones.

SULFADIAZINE given prophylactically to members of thearmed forces to protect them from meningitis in case ofa threatened epidemic will not affect their ability to pilotan airplane, drive a jeep or perform other tasks requiringhand-eye coordination and swift reaction, it appears fromstudies reported in the Journal of the American MedicalAssociation. The studies were made by Dr. Alison H.Price, of Jefferson Medical College and Hospital, Phila-delphia, and John C. Pedulla, safety examiner for thePennsylvania State Police. Sulfadiazine in amounts usu-ally considered adequate for treatment or prevention ofcertain infections was given to ninety healthy young menmedical students. Eye-hand coordination and reactiontime before and after the sulfadiazine were tested onapparatus used to determine the fitness of automobiledrivers. The same tests were given to forty-four studentswho did not receive any sulfadiazine and who served ascontrols. No significant difference was found betweenthe controls and the men taking sulfadiazine. What ef-fects there might have been if the men had been sufferingfrom an infection in addition to receiving the drug was,however, not learned from the tests.

10 VOL. 99, NO. 2579

J 2 4E - 1

PHOTOMICROGRAPHYTHEORY AND PRACTICEBy CHARLES P. SHILLABER

This book constitutes one of the most comprehensive treatments of the subject availablein any language. The content is unusually precise and accurate. It affords a thoroughstudy of the basic principles of photomicrography.A large part of the material is devoted to the actual procedures to be followed, with fullexplanations of how to obtain the best results on various kinds of subject matter: Aftera detailed explanation of each manipulative technique, either a question is propounded toemphasize the point under consideration, or an experiment is set up to be performed.Application is made to biological, chemical, and metallurgical materials. Almost allequations are completely derived.The book covers the adjustments and various techniques relating to the microscope andthe illuminating system; the use of sensitive material, and the preparation of the speci-men. Various industrial products are used as criteria to simplify explanations. Thoseproblems of optics and mechanics are studied which are fundamental to an understandingof the compound microscope and its operation in the field of photomicrography. Par-ticular stress is placed upon the importance of exact and precise alignment of all opticalparts.In all, over seven hundred pages of information are given. The practical value of thedata is readily discernible; for example: The book shows how, for stated magnifications,the lenses and bellows extension necessary to cover plates of various sizes, can be deter:mined in advance; several pages are devoted to the study of the optimum image and howit may be recognized; the correct use of various condensers is given, with comparativephotomicrographs and directions for experimental work; The advantages and disadvan-tages of various methods of illumination as well as the proper condenser adjustment areclearly shown by example; the effects of color screens are carefully explained and thetheory is then applied to stained or naturally colored specimens; every effort is made toemphasize working limits (optical limits) of equipment and the method of determiningthese limits.CONTENTS: The Microscope-Nomenclature and Definitions; Laboratory Work; Questions. LampHouses, Lamps, Methods of Lighting, and Photometric Units; Laboratory Work; Questions. Light,Lenses, Images, and Objectives; Laboratory Work; Questions. Oculars, Illuminating Apparatus, Slides,Cover Glasses, and the Effect of Dirt on the Optical System; Laboratory Work; Questions. Optical LightFilters and the Control of Glare; Laboratory Work; Questions. Cameras, Photosensitive Material,Formulae and Photographic Technique; Laboratory Work; Questions. Mounting Media, Stains, Re-agents, and Solvents; Their Use and Application in Photomicrography. Analysis of Practical Photo-micrographical Problems. Glossary. Addendum. Index.773 pages I11ustmted 5j by 81 $10.00

JOHN WILEY & SONS, Inc., 440-4th Ave., New York 16, N. Y.

E-I- -1

.Juxz 2 1944p SCIEN TS 11

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12 SOIENfJE-ADVERTThJEMENTS

ItfeaVe~cge sc4C4t4 a'~

THE CRAFTSMANPREPARES TO TEACH

By Jackey & Barlow

This.book gives clear directions on preparingthe subject matter and on the use of successful.teaching techniques for all kinds of industrialtraining courses. Written by men who havebeen in charge of trade and industrial teachertraining in California, this is a most practicaltext and handbook for all those with little orno previous teaching experience now calledupon to train industrial workers. $2.00

AN INTRODUCTION TONAVIGATION & NAUTICAL

ASTRONOMYBy Shute, Shirk, Porter & Hemenway

Suitable for individuals or groups interestedin either sea or air navigation. Complete initself, it requires no supplementary books,charts, tables, or almanacs. Over 400 prac-tical problems. Tables and diagrams fromofficial sources. Over 150 illustrations, espe-cially drawn for this book. The authors arein charge of navigation courses at the ChoateSchool. $4.50

FORM SHEETS FOR LINE OF POSITION BYH.O. 211 AND H.O. 214-$.75

LATHE OPERATIONSMILLING MACHINE OPERATIONS

By Lewis E. King

These two manuals provide all the basic tech-nical information necessary for performingeach operation on lathes and milling machines.The material is organized to be of maximumusefulness in shop classes. The author, anexperienced toolmaker, has been District Su-pervisor of vocational training for war work-ers in Detroit. LATHE OPERATIONS-$1.75. MILLING MACHINE OPERA-TIONS-Ready in August, $1.75 (probable)

BASIC MATHEMATICSFOR WAR AND INDUSTRY

By Daus, Gleason & Whyburn-

The principles of arithmetic, algebra, planeand solid geometry, and plane and sphericaltrigonometry essential to the work of mechan-ics, radio men, draftsmen, etc. are here clearlyand simply explained. Many illustrationsand nearly 800 very practical, up-to-dateproblems. Professors Daus and Whyburnare on the staff of the Univ. of Calif. Pro-fessor Gleason is on the staff of San DiegoState College. $2.00

NAVIGATIONALTRIGONOMETRYBy Rider & Hutchinson

Provides a thorough training in the mathe-matics basic to navigation, with extensive ap-plication to modern sea and air navigation,including the sailings, charts and lines of po-sition. Tables include a complete five-placetable with one minute intervals of naturaland logarithmic haversines, arranged fromBowditch by authority of the U. S. Naval De-partment. Professor Rider is on the staff ofWashington University and Professor Hutch-inson is on the staff of the University of Colo-rado. $2.00

AERODYNAMICSBy Lt. L. R. Parkinson

This is the first book to discuss both elementaryand more complex aspects of aerodynamics ona level presupposing no more than a highschool education. It provides basic informa-tion on nomenclature, fundamental theory,and some of the most important advancedtheory such as dynamic stability. The authoris Technical Advisor at the Naval AircraftFactory in Philadelphia. Ready in July.$2.00 (probable)

74 e

4

VOL. 99, No. 257912 SCIENCE-ADVERTISEMENTS

JuE2 94SINE-DETSMNS1

Lb4(s404 t'i44 ca'le

ULTRA-HIGH-FREQUENCY RADIO ENGINEERINGBy WILLIS L. EMERY, Radio Engineer, Naval Research Laboratory

Both the theory of ultra-high-frequency and the practical operation of ultra-high-frequencyequipment are covered in this book. It provides the special training in this field prescribed forthe armed forces, and is also an excellent handbook for anyone operating or manufacturingultra-high-frequency equipment. It can be readily understood without a full background inelectrical or communication engineering. Laboratory exercises for practical training are in-cluded. Techniques of ultra-high-frequency work are stressed. Ready in August. $3.50(probable)

SHOP JOB SHEETS IN RADIO Book I. Fundamentals~~~~~~~~~~~Book II. Service ProblemsBy ROBERT N. AUBLE, Supervisor of Signal Corps Radio School, Indianapolis

These laboratory exercises give shop training in all radio fundamentals. The first book suppliesthe basic training needed by all communications repairmen and operators. The second bookcompletes the training for radio mechanics. In each exercise or "job" the fundamental theoryinvolved is outlined, and the job itself developed in what-to-do steps to insure that the learnerknows what he is doing and why. Bk. I, $1.50. Bk. II, Ready in June. $1.50 (probable)

INTRODUCTION TO -PRACTICAL RADIOBy DURWARD J. TUCKER, Chief Radio Engineer of Stations WRR, KyP, and KVPA in Texas

This book presents a complete course in radio fundamentals suitable either for self study or forclass work. The treatment of basic principles is more extensive than is usual in elementarybooks, and is entirely up-to-date. A review of the mathematics needed is included with eachtopic. There is also much practical material on the application of principles to the variouselements in radio equipment. Ready in the summer. $4.00 (probable)

PRINCIPLES OF RADIO FOR OPERATORSBy BALPH ATHERTON, Chief of Radio Theory Instruction,

Naval Radio School, Miami University, Ohio

The elementary theory and practical laboratory work basic to the training of radio operators isgiven here in sixteen lessons. Designed for students preparing for radio work in the Navy,the book gives maximum practical training in minimum time. Organized for convenience andefficiency in teaching, it will be a useful book for anyone seeking an elementary but usableknowledge of radio. Ready in the summer.

PRACTICAL ANALYTIC GEOMETRY WITHAPPLICATIONS TO AIRCRAFT

By ROY A. LIMNG, Head of Engineering-Loft Mathematics, North American Aviation, Inc.

This book gives a practical system of analytic calculation techniques for direct use in the air-craft, automotive, and marine industries. The procedures and material in the book constitutethe basis for the establishment of all basic engineering, lofting and tooling dimensions for allaircraft of the North American Aviation, Inc. 328 pp. $4.50

6011 Ad by It,#

JUNZ 2, 1944 SCIENCE-ADVERTISEMENTS 13

14 SCIENCE-AiiVEBTISEMEI.tTS VoL. 99, No. 2579

Two standard laboratory manualsEXPERIMENTAL GENERAL CHEMISTRY

By J. W. Neckers, T. W. Abbott, Professors of Chemistry,and K. A. Van Lente, Associate Professor of Chemistry,Southern Illinois State Normal University

A N excellent laboratory manual now keyed to INTRODUCTORY COLLEGE CHEMISTRYby Babor and Lehrman and also to several other leading texts. Its thoroughness and atten-

tion to detail have won an increasing number of users. Each of the 61 experiments is precededby a "Prellninary Exercise" which each student is to answer and hand in to the instructor beforethe laboratory period. At certain strategic points in each experiment, the "O.K." of the instructoris required before the student may proceed.

282 pages, 22 illustrations 82" x 11" $1.75

Laboratory Manual for GENERALCOLLEGE CHEMISTRY

By Joseph A. Babor and Alexander Lehrman, Associate Pro-fessors of Chemistry, College of the City of New York

A combined laboratory manual and notebook prepared primarily for use by students with abackground of high-school chemistry and keyed to the authors' GENERAL COLLEGE

CHEMISTRY and to several other standard texts of this level. It includes cross-section paper,table of atomic weights, table of logarithms and the periodic table. Each of the 72 experimentsconsists of discussion, direction, problems and a list of the apparatus and chemicals needed.

289 pages, 46 illustrations 8¼" x 11" $1.75

THOMAS Y. (jflt llCOMPANY432 Fourth Avenue New York 16, New York

There has been no price increase in any CROWELL text or manual since before, Pearl Harbor

SCIENCE-ADVERTISEMEXTS14 VOL. 99., No..2579

JUE294SINE-DETSMNS1

l~ee~* McGRAW-HILLB y oo44GENERAL METEOROLOGY

By HORACE R. BYERS, Professor of Meteorology, University of Chicago. 642 pages, 5i x 84,298 illustrations. $5.00

Although based upon the author's well known Synopticand Aeronautical Meteorology, this is essentially a newbook, meeting the need for a general text embodying thefundamentals as well as the modern developments insynoptic meteorology. Recent advances in the field that

hate been included are: isentropic analysis, new fore-casting uses of upper-air charts, modification of theNorwegian concepts from upper-air evidence, behavior ofthe stratosphere in day-to-day weather, etc.

METHODS OF ADVANCED CALCULUSBy PHILIP FRANKLIN, Professor of Mathematics, Massachusetts Institute of Technology. Inpress-ready in June

Primarily designed as a textbook for a course in advanced applications to space geometry, integration, special highercalculus of a type now taken by many students whose functions, Fourier series, differential equations, vectormajor field of interest is engineering, mathematics, or analysis, the calculus of variations, etc.science. Covers Taylor's series, partial differentiation,

EXPLOSIONS, THEIR ANATOMY AND DESTRUCTIVENESSBy CLARK S. ROBINSON, Lt. Colonel, Ordnance Dept., U. S. Army, on leave from MassachusettsInstitute of Technology. 92 pages, 5ix 81. $1.50

Deals with the destructiveness of explosions of bombs andshells in warfare, and With the results of accidental ex-

plosions in munition plants and elsewhere. The authordescribes what happens when an explosion occurs, explain-

ing the various effects in simple, nontechnical language.A feature of the book is the discussion of 125 notableexplosions.

LABORATORY MANUAL FOR GENERAL ZOOLOGYBy TRACY I. STORER, Professor of Zoology, University of California at Davis. McGraw-HillPublications in the Zoological Sciences. In press-ready in August

Designed to accompany Storer 's General Zoology, thisforthcoming manual for the beginning course in zoologyincludes detailed exercises on the structure and physiol-ogy of the frog, others on the general principles of animalbiology, and a series on common representatives of the

principal groups of animals from amoeba to amphioxus.The extent and variety of material result in unusual flexi-bility and permit considerable latitude in outlining a lab-oratory program.

SUGGESTIONS FOR LABORATORY INSTRUCTORSBy TRACY I. STORER. In press-ready in August

This booklet contains suggestions regarding laboratory are described in detail, and step-by-step explanations ofdemonstrations and procedures, and is designed to aid the various exercises are given. A feature of the bookletthe instructor in conducting his classes. Demonstrations is the inclusion of 32 useful formulas.

Send for copies on approval

McGRAW-HILL BOOK COMPANY, Inc.330 West 42nd Street, New York 18, N. Y. Aldwych House, London, W.C 2

15JUNz 2, 1944 SCIENCE-ADVERTISEMENTS

SCIENCE-ADVERTISEMENTS VoL. 99, No. 2579

TROPICAL DISEASE MEDICHROMESA series of approximately 150 2 x 2" (35 mm) Kodachrome transparencies (lanternslides) made with the cooperation of Dr. Henry E. Meleney, Dr. Harry Most andDr. Dominic DeGiusti, Department of Preventive Medicine, New York UniversityCollege of Medicine. Slides Nos. MT45, 46, 47 are from the Army Medical Mu-seum, Washington, D. C.

The Following slides are ready:MT 1. Yellow Fever-Liver lobule showing mid-

zonal necrosis H&E x 100-300MT 6. Plague-exudate in alveoli H&E x 500MT .8. Plague bacilli in smear of spleen x 1200MT 10. Bacillary dysentery-smear of exudate in

stool. Iron Htx x 500MT 25. Relapsing fever-spirochaetes smear of blood

giemsa x 1000MT 30. Histoplasmosis-section of lung, liver or

spleen showing Histoplasma in macrophagesH&E x 1000

MT 30a. Histoplasmosis-smear in bloodMT 39. Actinomycosis-section of lung showing rays

H&E x 1000MT 40. Rhinosporidium seeberi, nasal polyp

MT 45. Plasmodium vivax, life history from drawingsMT 46. malariae " " "MT 47. falciparum " " "MT 56. Malaria-section of brain P. falciparum-

capillaries, 1. p. H&E x 500MT 56a. Malaria-section of brain P. falciparum-

capillaries, h. p. x 1200MT 58. Malaria-oocysts Htx x 1200MT 60. -sporozoites giemsa x 1000MT 65. African trypanosomiasis-section of brain-

perivascular infiltration H&E x 100MT 78. Trypanosoma lewisi-blood of rat-smear

giemsa x 1000MT 80. T. cruzi-smear of culture-giemsa x 1000MT 80a. T. cruzi in muscleMT 85. Leishmaniasis-L. donovani-section of liver

Kala Azar H&E x 1000MT 88. Leishmaniasis-L. donovani -smear of bone

marrow, piemsa x 1000MT 88a. Leishmaniasis-L. donovani-blood smear

x 1000MT 92a. Leishmaniasis-L. tropica plate cultureMT 105. E. histolytica-abscess of liver H&E x 100

or lessMT 107. E. histolytica-ulcer of skin low power

H&E x 50MT 107.1 E. histolytica-invading skin x 100MT 107.2 " -in lung x 300MT 107a. " " -" " x 60MT 107b. " -invading fat (skin)MT 109. " " -motile- smear feces - iron

Htx H&E x 1000 or 500MT 127. Bacillary dysentery, section of colon H&E

x 10MT 130. Wuchereria bancrofti-Microfilaria in blood

Htx x 500MT 131. Wuchereria malayi-microfilaria in blood

x 400

MT 132. Wuchereria bancrofti-section of lymphnodewith gravid female H&E x 100

MT 138. Onchocerca volvulus-section of nodule H&Ex 40

MT 138a. Onchocerca volvulus-section of nodule H&Ex 200

MT 140. Mansonella ozzardi-larva in blood Htx x 500MT 142. Acanthocheilonema perstans-larva in blood

Htx x 500MT 156a. Schistosomiasis-abscess of submucosa evac-

uating through gland H&E x 60MT 164. S. Japonicum-eggs in brain H&E x 100MT 164a. " " -adults whole mount, copulat-

ing x 5

MT 164b. S. Japonicum-snailsMT 168. " mansoni-snail x 10MT 169. " -adults in mesenteric vessels x 1MT 170. " " -adults, c. s. in rabbit intestineMT 170a. " " -young worms in liverMT 170b. " " -adults, c. a. in liverMT 173. Clonorchiasis-worms in bile duct H&E x 10MT 173a. Clonorchis sinensis-whole mountMT 179a. Paragonimiasis-whole mountMT 179b. " -P. westermani in lung, c. s.

MT 180. eggs in abscess of testisH&E x 65

MT 180a. Paragonimiasis-single egg in abscess oftestis H&E x 500

MT 181. Fasciolopsis buski, whole- mount x 1MT 182. Fasciola hepatica, whole mount x 1MT 183. " c. s. in liver x 5MT 188a. Trichinosis-Trichinella, encysted in muscleMT 189. Cercariae straight tailed x 125MT 198. Trichinosis-larvae in brain section with

nodule H&E x 100MT 212. Cestodes-Taenia saginata segment; injected

x 1-2MT 212a. Cestodes-Taenia saginata-segment in ap-

pendixMT 212b. Cestodes-Taenia saginata-four continuous

segments, injectedMT 214. Cestodes-T. solium head x 10MT 216. " -" " segment stained x 1-2MT 218. " -" " section of cysticercus

in brain H&E x 5

MT 227. Cestodes-Diphyllobothrium latum segmentx 1-2

MT 237. Cestodes-Section of cyst wall with broodcapsule and scolices H&E x 40

MT 266. Fleas-Xenopsylla cheopis, maleMT 267. " - " " , femaleMT 270a. Lice-Pediculus humanus, femaleMT 310. Cimex lectutariusMT 315. Tse tse fly wing

$.90 each in Adams Slide Binders.80 each in Kodak Readymounts

Orders for 50 slides less 5 %, for 100 slides or more less 10 %

Write for complete listing MT

ADAMS

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SCIENCE-ADVERTISEMENTS

(Colloidal Titania x 700,000 as seenwith the RCA Electron Microscope)

THIS micrograph, made with anRCA Electron Microscope, shows

colloidal pigment particles (colloi-dal titanium dioxide) magnified100,000 times.Each of these particles is approx-

imately a millionth of an inch indiameter. In other words, a row offorty such particles would just aboutspan one micron.Even though the original photo-

graph is necessarily here reproducedby the relatively crude method of ametal engraving and printers' inkon inferior wartime paper; still youcan see to a remarkable degree thecubical structure which character-izes these particles.

This, indeed, is a striking exampleofthe extraordinary resolving power,and sharpness and depth of focus,

which the RCA Electron Microscopeaffords, in addition to its tremen-dous magnifying powers.With this instrument in research

laboratories, and in use as a meansof checking and controlling manu-facturing processes, the causes of

-W

many defects and difficulties inmaterials and manufactured productsare being discovered and corrected.

Inquiries should be addressed toElectron Microscope Section, RADIOCORPORATION OF AMERICA, Camden,New Jersey.

* BUY MORE WAR BONDS *

RCA ELECTRON MICROSCOPE

RADIO CORPORATION OF AMERICARCA VICTOR DIVISION, Camden, N. J.

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JUNE 2, 1944 17

18 SCIENCE-ADT.ERTISEMENTS VOL. 99, No. 257.

A PE-CO is the Easy,Accurate Way to MakeCorrect Copies for All !All departments have correct andcomplete information simultaneouslywhen A-PE-CO photo-copies are

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is SCIENCE-ADVERTISEMENTS VOL. 99p No. '2579

JN2,14SIE E-A ERIMNT 19

Kodak Plates for

ELECTRON MICROSCOPY

The Kodak plate best suited to electron microscopy, and theone most generally used for this purpose, is the Kodak MediumLantern Slide Plate. It has high contrast and fine granularity.For higher contrast and finer granularity, the Eastman Spec-

troscopic Plate, Type IV-0, has proved quite suitable. For ex-

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lem that may arise in connection with the photographic phasesof electron microscopy.

EASTMAN KODAK COMPANYResearch Laboratories Rochester 4, N. Y.

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Reprrentatives in Principal C ties

No. 10 Analytlcal Balance

HENRY TROEMNERThe Standard of Excellence for 102 years.

Manufacturer of the highest grade Analytical,Assay and Pulp Balance and Weights of Pre-cision.

Catalog 19S9S911 Arch Street

Philadelphia, Pa.

JUNE 2, 1944 SCIENCE-ADVERTISEMENTS 19

7~ T- ~ -.- l, --

L.99,XNo. S~279

Spenom Petrograpkic Microscope used in the Laboratory of OtAd" Elcc'ro-Ckamical Co.

The Microscope enlists or WarModern war, it may truthfully be In accomplishing

said, is a war of chemistry.' croscope is playing"To keep the U. S. forces fighting," part. Spencer is devc

states one authority, "industrial chem- facilities to the usistry must produce five pounds of ex- tune demand for micrcplosives for evcry soldier every day." 'Incendiary, depth and aerial bombs,smoke screens, flares and most of theingredients for, the devastating fire,power of our land, sea and air-forcesmust come from our chemical.plants.More than this, chemistry must create sencernew products, new substitutes, to re- BUFFALO

place lost sources of rubber, fuels, SCIENTIFIC INSTRUOmetals' and other materials. AMERICAN OPTI

this task the mi-, an indispensable)ting 'its expandednprecedented war-oscopes ofall types.

LENS COMPANY,NEW YORKblENT DIVISION OFCAL COMPANY

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