THE CARVER LABORATORY PRESS

Some of the manygeneral applicationsof the CarverLaboratory Press

Pressing Liquor from PulpPressure Filtering of Thick FluidsSplitting of Oils, Stearines andWaxes

Fatty Acid DeterminationsPress out Plant and Fruit SupsPressing Extracts and FlavorsPressing Fluids from Animal TissuePressing BacteriaPressing out Vaccines and Viruses

CPlastic MoldingPressure-Temperature Molding

TestsFlow TestsExtrusion and Extrusion TestsLaminatingVulcanizingMetallographic Mounting

.

Briquetting, Cake FormingCompression TestsCrushing TestsBreaking TestsShearing TestsGluing and Gluing TestsSpring TestingDrawing, Forming, Embossing,

Forcing

In photograph, plastic ash trays are being molded on theCarver Laboratory Press.

Plastic molding is only one of the many applications ofthe Carver Press. Here it is shown being used to mold ashtrays in single-cavity compression mold. For such workthe Press is equipped with Carver Standard Electric Hotplates. Send coupon for this useful example of a CarverPress application.

Recognized as standard for general research anddevelopment, the Carver Laboratory Press is usedthroughout the world. 'One of the most useful pieces ofequipment any laboratory can have." In these words auser sums up the variety of services performed by theCarver Press.

If you have a laboratory, small or large, you havemany potential uses for this Press. One of its moneysaving features is the range of Carver Standard Acces-sories available as optional equipment.

Send today for latest Catalog. It illustrates the Pressand accessories and describes some of the generalapplications.

The Carver Press provides com-plete range of temperatures fromroom temperature to 4000 F. Ad.justable by thermoswitch to withinplus or minus 20 F. Equipped withaccurate 6" gauge that providesload readings up to 20,000 Ibs.Low pressure gauges optional.Carver Standard Accessories in-clude Electric or Steam Hot Plates;Electrically Heated and WaterCooled Hot Plates; Carver TestCylinders; Swivel Bearing plates;Cage Equipment, etc.

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Forthcoming Texts

BLACK: An Introductory Course in College PhysicsThird Edition

Brought competely up to date to include discussions of such new developmentsas radar and atomic power, the third edition of this text maintains the same clarityand style of the first two editions. The problems are carefully graded and arereal problems based on actual practical data. A separate answer pamphlet isavailable for instructors. To be published this spring. $4.25 (probable)

WELD: A Textbook of HeatThis volume presents a treatment of heat and elementary thermodynamics on thejunior-senior level. It introduces the student to sufficient thermal phenomenafor all general purposes, and prepares him for further study in thermodynamics,meteorology, engineering, chemistry, etc. Free use is made of differential andintegral calculus, and where simple differential equations are required solutionsare given in such form as to be easily verified by the student. To be publishedthis spring. $4.00 (probable)

CHURCHMAN: The Theory of Experimental InferenceTreating the general problem of inference in the experimental sciences, this bookmakes full use of the contributions of the mathematical statisticians, consideringthose of Pearson and Neyman, and the further generalizations of Wald. Theauthor presents a thorough examination of the historical philosophical schoolson the problem of methods in the sciences, and treats the relationship betweenprogressive aims of science and the methods of science. To be published thisspring. $3.50 (probable)

A Macmillan Slidefilm Seriesto accompany

MAVOR: General Biology, 3rd EditionA new series of three 35-millimeter slidefilms, 145 numbered frames, is nowavailable. Order from the College Department. $15.00 a set.

THE MACMILLAN COMPANY 60 Fifth Avenue New York 1 1

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Forthcoming Texts

SELECTED WORKS OF HENRY C. SHERMANThis new reference book for courses in food and nutrition contains a new articleby Dr. Sherman entitled-Looking Forward in Nutrition, and more than one hun-dred papers consisting of reprints of journal articles on food and nutrition, andaddresses and reviews by Dr. Sherman. An informative biography is also in-cluded. To be published this summer. $5.00 (probable)

SHERMAN: Food Products, 4th EditionMaintaining the general scope and arrangement of the first editions of this well-known text, the new fourth edition has been brought completely up to date andrevised in light of new developments in the field. Recognizing today's growinginterest in the subject, special attention has been given to the percentages of indi-vidual amino acids in the chief proteins of foods. To be published this summer.$4.00 (probable)

WEST: Calculations of Quantitative AnalysisDesigned to be almost completely self-teaching, this new text provides a readilyunderstandable survey of all the fundamental calculations of both qualitativeand quantitative analysis. The subject is developed logically with a carefulsequence of thought, and special attention has been given to those topics mostlikely to be confusing. Tables of molecular as well as atomic weights are in-cluded. To be published this spring. $3.00 (probable)

LIVINGSTON: Physico Chemical ExperimentsRevised Edition

In the revised edition of this laboratory manual the author has clarified certainexplanations, modified the technique of a few experiments to simplify the stu-dent's laboratory work, and added new experiments requiring simple apparatus.The section on measurements has been revised, and a brief discussion of reportwriting has been added. To be published this spring. $3.00 (probable)

THE MACMILLAN COMPANY -60 Fifth Avenue New York 1 1

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NEW EDITIONS*

The MachineryBy ANTON J. CARLSON, M.D. and VICTOR JOHNSON, M.D.

REVISED 1948 EDITION

New material on: Transfusion of blood, the "wonder" drugs, vitamins,pernicious anemia, emotional disorders, cancer, radio-active elements inmedicine, plus several new illustrations. $4.50

Without PBackbonesBy RALPH BUCHSBAUM

An Introduction to the Invertebrates

REVISED 1948 EDITION* Completely up to date* 537 magnificent photographs-more than 150 of them new* Legends for photographs rewritten-and, as before, form an integral partof the text

* 316 drawings and diagrams-many not included previously* Gravure illustrations numbered for easy reference $5.00

The revised editions of The Machinery of the Body and Animals Without Backbones will be ready around July 1.Order your examination copy (see coupon on next page) and plan now to use these new editions in your fall classes.

X THE UNIVERSITY OF CHICAGO PRESS

20

FOR FALL CLASSES!NEW!

MANUAL FOR LABORATORY WORK IN

Mammalian e

*Physiology -aiBy FRED. D'AMOUR and FRANK R. BLOOD

The Manual includes a group of 50 experi-ments in which the rat is used exclusively. Itprovides ample material for work in physiologyfor premedical students and physiology majors.Two hundred and fifteen large and amazingly

clear photographs illustrate, step by step, theinstructions for each experiment.Equipment required is all low cost-most of

it standard laboratory apparatus. Rats are

cheaper, hardier, and more easily obtainablethan other laboratory animals.The authors follow the customary sequence

of experiments: blood, heart and circulation,respiration, digestion and metabolism, excre-tion, nervous system, endocrine system, andantibody formation. This arrangement is flexi-ble enough, however, to allow adaptation toindividual course needs.Now available. $~2.75

Two other standard texts in Biological ScienceFor vertebrate zoology

MAN AND THE VERTEBRATESBy ALFRED SHERWOOD ROMER. This textpresents a clear and readable story of the evo-lution of the body of man through four hundredmillion years. 552 pp., hundreds of illustrations.

$4.50For elementary botany

THE STORY OF THE PLANT KINGDOMBy MERLE C. COULTER. Phylogenetic se-quence holds a more prominent place in this bookthan in most others-not in the form of dogma,but as an attractive basis for organization.284 pp., 119 illustrations. $2.75

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Please send me the book (s) checked.

[ MACHINERY OF THE BODY@ $4.50

1 ANIMALS WITHOUT BACK-BONES @ $5.00

L] MANUAL FOR LABORATORYW 0 R K I N MAMMALIANPHYSIOLOGY @ $2.75

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STANDARD SCIENTIFIC PUBLICATIONS

BOYD-INTRODUCTION TOMEDICAL SCIENCE

Third editiqn. 366 pages. 125 illustrationsand a colored plate. $3.50.

BRUMLEY-DISEASES OFSMALL DOMESTIC ANIMALS

Fourth edition. 422 pages. 37 illustrations.$5.00.

BUCHANAN-FUNCTIONALNEURO-ANATOMYNew. About 280 pages. 199 illustrations,some in color. In Press.

BURCH & REASER-PRIMEROF CARDIOLOGYNew. 272 pages. 203 illustrations. $4.50.

BURCH & WINSOR-PRIMEROF ELECTROCARDIOGRAPHY

215 pages. 235 illustrations. $3.50.

CHANDLER-DECIDUOUS ORCHARDS438 pages. 109 illustrations. $4.50.

COWDRY-TEXTBOOK OF HISTOLOGYThird edition. 426 pages. 317 illustrations,13 in color. $7.00.

CRAIG-LABORATORY DIAGNOSIS OFPROTOZOAN DISEASESNew (2d) edition. 384 pages. 56 illustra-tions and 7 plates in color. $6.50.

CRAIG & FAUST-CLINICALPARASITOLOGYFourth edition. 871 pages. 305 illustrationsand 4 colored plates. $10.00.

FROHMAN-BRIEF PSYCHOTHERAPYNew. 265 pages. $4.00.

GOLDBERGER-UNIPOLAR LEADELECTROCARDIOGRAPHYNew. 182 pages. Illustrated. $4.00.

GRAY-ANATOMYNew (25th) edition. About 1450 pages. Ap-proximately 1260 illustrations, mostly in colors.In Press.

KENDALL-MICROSCOPIC ANATOMYOF VERTEBRATESNew (3d) edition. 354 pages. 225 illustra-tions. $6.00.

KOVACS-ELECTROTHERAPY& LIGHT THERAPY

Fifth edition. 694 pages. 352 illustrationsand 1 color plate. $8.50.

KRAINES-THERAPY OF THENEUROSES & PSYCHOSESNew (3d) edition. About 580 pages.In Press.

LEVINSON & MacFATE-CLINICALLABORATORY DIAGNOSIS

Third edition. 971 pages. 192 illustrationsand 15 plates, 7 in color. $10.00.

McCULLOCH-DISINFECTION& STERILIZATION

Second edition. 472 pages. 68 illustrations.$6.50.

MARSHALL-APPLIED MEDICALBACTERIOLOGYNew. 340 pages. Illustrated. $4.50.

QUIRING-THE EXTREMITIES117 pages. 106 illustrations. $2.75.

QUIRING-THE HEAD, NECK & TRUNK115 pages. 103 illustrations. $2.75.

SIMMONS & GENTZKOW-LABORATORY METHODS OFTHE UNITED STATES ARMY

Fifth edition. 823 pages. 103 illustrationsand 8 color plates. $7.50.

TALBERT-GENERAL HORTICULTURE452 pages. 129 illustrations. $4.00.

Washington Square LEA & FEBIGER Philadelphia 6, Pa.

22

The incomparable SIR JAMES JEANS tells the dramatic storyof THE GROWTH OF PHYSICAL SCIENCE .....

Pythagoris, Euclid, Archimedes, Newton, Einstein, Planck . . . disregarding the leg-ends concerning the great pioneers of physical science, SIR JAMES JEANS weaves thefacts of the men who, in Housman's phrase, "set back the frontier of darkness," into a dra-matic and exciting story. Illuminating and enlightening to the layman, THE GROWTHOF PHYSICAL SCIENCE also holds many hours of delightful reading for the scientist.

Supplemental to the text are many beautiful illustrations. Other books by Sir JamesJeans include, Through Space and Time, The Stars in Their Courses, Science and Music, Phys-ics and Philosophy.... . $4.00

The Growth of Physicalby Sir James Jeans

cience

Pitirim A. Sorokin, Professor of Sociology at Harvard University says, "Afirst-class contribution to a science of culture, sociology, and philosophy."

Perhaps once in a generation a book appears which is capable of influencing a changingworld. Such a contribution is F. S. C. NORTHROP'S The Meeting of East and West. Hisbrilliant analysis arrives at a basis of world culture which one critic calls, "the soundest ofall recent statements made about world understanding and peace." $6.00

The Meeting of East andby F. S. C. Northrop

West

Atomic theory simplified

Atomic Energyin Cosmic and Human Life

by George Gamow

Here, one of the foremost nuclear physiciststraces the entire development of atomic en-ergy, answering the questions: What is it?Where did it come from? How can it beused? The physicist will be delighted withProfessor Gamow's charming explanatorycartoons.

$3.00

s ilIs there a biologicalbasis for altruism?

Life and Moralsby S. J. Holmes

A highly provocative book presenting aclear step-by-step argument in favor of anethical system based on the biological, psy-chological, and social sciences. Holmesmaintains that the focus of morality mustbe changed from "man as an individual" to"man as a member of society."

$3.00

The Macmillan Company

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Outstanding Science Texts

H ERE are briefly described texts and reference works of provedvalue. Those in preparation are scheduled to be available forconsideration for fall classes. Your inspection is cordially invited.

ANATOMY and PHYSIOLOGY* Atwood's A Concise COMPARATIVE ANATOMY

By WILLIAM HENRY ATWOOD. 406 pages, 303 illustrations (1947)$3.75

*Anthony's TEXTBOOK OF ANATOMY AND PHYSIOLOGYBy CATHERINE PARKER ANTHONY. 510 Pages, 184 illustrations.Second Edition (1946) $3.75

* Anthony's ANATOMY AND PHYSIOLOGY LABORATORY MANUALBy CATHERINE PARKER ANTHONY. 295 pages. Illustrated. SecondEdition (1946) $2.50

* Zoethout's Introduction to HUMAN PHYSIOLOGYBy WLLIAM D. ZOETHOUT. 424 pages, 138 text illustrations, 4 colorplates ( 1948) $4.00

* Zoethout-Tuttle's TEXTBOOK OF PHYSIOLOGYBy W. D. ZOETHOUT and W. W. TUTTLE. 750 pages, illustrated. NinthEdition (1946) $4.75

* Zoethout's LABORATORY EXPERIMENTS IN PHYSIOLOGYBy W. D. ZOETHOUT. 263 pages, 97 illustrations. Fourth Edition(1948) $3.00

* Main's Synopsis of PHYSIOLOGYBy R. J. MAIN. 341 pages, illustrated (1946) $4.50

CHEMISTRY* Roe's PRINCIPLES OF CHEMISTRY

By JOSEPH H. ROE. 403 pages, 47 illustrations, 4 color plates. SixthEdition (1944) $3.00

* Roe's A LABORATORY GUIDE IN CHEMISTRYBy JOSEPH H. ROE. 191 pages, illustrated (1944) $1.25

* Whiteford.Coffin's ESSENTIALS OF COLLEGE CHEMISTRYNew Third Edition (In Preparation)

* McClendon's PHYSIOLOGICAL CHEMISTRYBy J. F. McCLENDON. 463 pages, 83 illustrations. Seventh Edition(1946) $4.75

* Kleiner's HUMAN BIOCHEMISTRYBy ISRAEL S. KLEINER. 573 pages, 70 illustrations, 5 color plates.(1945) $6.00

PHYSICAL EDUCATION* Kranz' KINESIOLOGY LABORATORY MANUAL

byLEON G. KRANZ. 180 pages, illustrated (1948) $2.75* Morehouse-Miller's PHYSIOLOGY OF EXERCISE

By LAURENCE E. MOREHOUSE and AUGUSTUS T. MILLER, Jr. 353pages, illustrated (1948) $4.75

24

For Class & Rererence Use

BACTERIOLOGY* Carter's MICROBIOLOGY AND PATHOLOGY

By CHARLES F. CARTER. New Fourth Edition (In Preparation)* Novak-Meyer's BACTERIOLOGY-Laboratory Directions for Pharmacy Students

By MILAN NOVAK and ESTHER MEYER. 248 pages (1947) $2.75* Dougherty-Lamberti A TEXTBOOK OF BACTERIOLOGY AND IMMUNOLOGY

By JOSEPH M. DOUGHERTY and ANTHONY J. LAMBERTI. 360 pages,102 illustrations (1946) $5.00

*Schaub-Foley's METHODS FOR DIAGNOSTIC BACTERIOLOGYBy ISABELLE G. SCHAUB and KATHLEEN FOLEY. 432 pages. ThirdEdition (1947) $4.50

* Sherwood's IMMUNOLOGYBy NOBEL PIERCE SHERWOOD. 639 pages, 27 illustrations, 7 color plates(1941) $6.50

BIOLOGY AND ZOOLOGY* White's GENERAL BIOLOGY

By E. GRACE WHITE. 659 pages, 334 illustrations. Third Edition (1946)$4.50

* White's A LABORATORY MANUAL OF GENERAL BIOLOGYBy E. GRACE WHITE. 278 pages. Third Edition (1946) $2.25

* Potter's ESSENTIALS OF ZOOLOGYBy GEORGE EDWIN POTTER. New Second Edition (In Preparation)

* Rogick's GENERAL ZOOLOGY LABORATORY MANUALBy MARY D. ROGICK. 322 pages, illustrated (1947) $3.25

* Parker-Clarke's INTRODUCTION TO ANIMAL .BIOLOGYBy JOHN B. PARKER and JOHN J. CLARKE. 532 pages, 172 illustrations.Second Edition (1945) $4.00

* Parker-Clarke's LABORATORY INSTRUCTIONS IN GENERAL BIOLOGY148 pages. Second Edition (1944) $2.00

* Potter's TEXTBOOK OF ZOOLOGYBy GEORGE EDWIN POTTER. 992 pages, 446 illustrations. SecondEdition (1947) $5.00

HEALTH AND HYGIENE*Turner's SCHOOL HEALTH AND HEALTH EDUCATION

By C. E. TURNER. 457 pages (1947) $3.50*Turner's PERSONAL AND COMMUNITY HEALTH

New Eighth Edition (In Preparation)

The C. V. MOSBY CompanyScientific Publications

St. Louis 3, Missouri San Francisco 9, California

25

New 1948 TITLES:Laboratory Manual of

COMPARATIVE VERTEBRATE EMBRYOLOGYAllyn J. Waterman, Williams College. Using the comparative method of treatment throughout, thisnew book integrates the work of laboratory and classroom by combining laboratory exercises with ex-tensive text material. Abundantly illustrated with photomicrographs and valuable tabular material.

308 pages 1948 $3.50

THE HUMAN BODY and ITS FUNCTIONS-RevisedCharles H. Best and Norman B. Taylor, University of Toronto. The authors have revised this excellentbrief text, retaining the vivid readable style and bringing subject matter up to date by incorporatingsome of the latest findings of medical science. Many new photographs, drawings, and color plates.

500 pages Ready in Early Spring Probable Price $4.00

MATHEMATICS OF FINANCEJ. Burton Linker and M. A. Hill, Jr., University of North Carolina. This clearly written text is de-signed to give students a thorough grounding in the practical side of the subject. The abundance ofexercises and the inclusion of thirteen standard tables help the student see through each problem.About 256 pages Ready in Early Spring Probable Price $3.25

AN IMPORTANT NEW REVISION:General College Chemistry

Fourth EditionLeon B. Richardson and Andrew J. Scarlett

Dartmouth CollegeOne of the most readable texts in the field has been brought completely up to date in this revision.The organization has been revised to introduce material on atomic structure and nuclear fission earlyin the book. Of special interest is the new material which has been included concerning recent in-dustrial developments in the fields of plastics, metals, and drugs. This is a beautifully made well-written basic text which will recommend itself both to student and teacher. Already widely adopted.704 pages, 1947, $4.25 A Laboratory Manual is available.

TWO STANDARD TEXTS:ASTRONOMY- Revised

William T. Skilling and Robert S. Richardson. The most up-to-date text in the field, this book is un-usual for its clear, simple presentation of the technical in terms of the untechnical. New star maps andtabular material make it invaluable as a reference.

692 pages 1947 $4.75

Qualitative Analysis and Chemical EquilibriumThorfin R. Hogness and Warren C. Johnson. This third edition of a popular text brings both labora-tory procedures and theoretical material up to date. Teachers have welcomed the reorganized presen-tation and the textual improvements.553 pages 1947 $3.20

Henry Holt and Company 257 Fourth Ave., New York 10L-26

NEW LEAD SHIELDfor Radioactive Samples

Reproduceable Geometries * Easily Decontaminated

^ Adequate shielding from stray radiation-plus surprising conveniencefeatures for the user-are combined in this new Model 3030 leadshield. Ninety-four pounds of lead, 13¾" thick throughout, providesdetector isolation from unwanted radiation. Aluminum liner mini-mizes scatter radiation. Machined sample holder assures accuratelyreproduceable geometries, and a cylindrical tunnel through the massaccommodates standard beta and gamma Geiger tubes.

Geiger-Mueller counters and other acces-sories of all types are available. Ask for cata-log information, or let us help in solving yourproblems in radioactivity instrumentation.

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NOW READY For DELIVERY!

"MICRO 35"The latest addition to the GAMMA line of

photomicrographic cameras.

A versatile unit for work with 35 mm black andwhite or color film.Available alone or in combination with GAMMA"Microflex" and "Standard" cameras.Orders for our "MICRO-Raptar" photographicobjectives for low power and macro work cannow be filled promptly. The following lensesmay be had:35 mm - 50 mm - 90 mm - 162 mm - 190 mm

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You'll use this handy reference book many,many times. Gives theory and application ofpH, Chlorine and Phosphate Control in 34 dif-ferent industries. Tells you how you can cuttesting time to the minimum . . . and secureaccurate determinations.

Completely illustrated and described are theTaylor Comparators which permit you to makesome determinations in as little as one minute.

SEE YOUR DEALER FOR EQUIPMENT

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All Taylor LiquidC o 1 o r Standardscarry an unlimitedguarantee againstfading.

OUR ENEMY THE

TERMITEBy Thomas Elliott Snyder, Senior Ento-mologist of the Bureau of Entomology andPlant Quarantine, United States Depart-ment of Agriculture.

Dr. Snyder discusses first the entomological,then the economic aspects of termites fromhis background of more than thirty-nineyears in field and laboratory. Completelyscientific, the book is so clearly written thatthe layman can understand it. This revisededition incorporates much new material,adds many new illustrations. Practical sug-gestions are made for building termite proofhouses and saving infected structures.261 pp., 84 illus., $3.50.

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Klett-Summerson Photoelectric ColorimetersColorimeters - Nephelometers - Fluorimeters- Write for CatalogBio-Colorimeters - Comparators - Glass Stand-ards-Klett Reagents.

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311 a

Ready Now!ENCYCLOPEDIA OF CHEMICAL REACTIONS

Volume II-CADMIUM, CALCIUM, CARBON,CERIUM, CESIUM, CHLORINE, CHROMIUM

Compiled and Edited byC. A. JACOBSON, Professor of Chemistry Emeritus,

West Virginia UniversityThe long-awaited second volume of this seriesis now ready for distribution. Identical instyle and format with Volume I, it combinesthe convenience of an authoritative index withinformational text ordinarily found only inabstract and reference works. Over 3000chemical reactions, involving the elementslisted above, are arranged alphabetically byformulas and by reagents, accompanied bya wealth of other pertinent data.

927 pages 0 3325 Reactions 0 $12.00ORDER NOW

REINHOLD PUBLISHING CORPORATIONRoom 1204, 330 West 42nd Street, New York 18. N. Y.Enclosed find $. for .... copies of ENCYCLOPEDIAOF CHEMICAL REACTIONS, Volume II. (Add 2% salestax to your remittance for orders delivered in New Yorkcity)

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LaMOTTECOMBINATION SWIMMING POOL SETfor small pools and those who do not care to installseparate units for chlorine and alkalinity.

This unit is appli-cable to the ranges ofchlorine and alkalinityactually required forswimming pool water,and will enable theoperator to keep hisalkalinity and chlorinevalues between thelimits required byState Health Depart-ment specifications.

They are complete with 3 color standards foreach test representing the upper and lower limitsof chlorine (0.2, 0.5, 0.7) and alkalinity (pH 7.2,7.6, & 8.0) together with reagents and necessaryglassware.

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Integration in Finite TermsBy JOSEPH FELS RITT $2.75

PUBLISHERS The first comprehensive exposition in mod-

of important scientific titles, both ern form of Liouville's theory concerningthe possibility of effecting integrations andreprints and originals, in mathemat- solving differential equations by elementary

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Crystalline EnzymesBy JOHN H. NORTHROP, MOSES

PRINTERS KUNITZ, and ROGER MOSS HERRIOTT

$7.50of monographs, dissertations, reports, A new edition of the work published inand out-of-print books and journals 1939 and cited in the award of the Daniel

Giraud Elliott Medal. Brings laboratorywork done in this branch of biochemistry

Write for information up to date.

Tables of Bessel Functions ofFractional Order, Vol. I

EDWARDS BROTHERS, INC. Edited by ARNOLD N. LOWAN $7.50

Dept. 5- 16 Ann Arbor, Michigan Columbia University Press2960 Broadway N. Y. 27, N. Y.

NAPHTHORESORCINOL -For determination of glucuronic acid by the

Tollens reaction, use Schwarz Naphthoresorcinol

(1,3-dihydroxynaphthalene). Write for a review

of methods for using Naphthoresorcinol in the

estimation of glucuronic acid. 1 A

ALSO

Adenine and its salts 6-Methyl ThiouracilAdenosine Nucleic Acid and itsAdenylic Acid saltsInorganic andCozymase Polidase (a vegetable Organic ChemicalsFructose Diphosphates enzyme)Glutathione Purines and PyrimidinesGuanine and its salts Xanthosine Biological StainsGuanosine d-RiboseGuanylic Acid 1-Sorbose Solutions

Write for Bulletins describing chemicals *in which you are interested Chemical Indicators

Test Papers

Write for copy of our catalogThe COLEMAN & BELL Co.

Manufacturing Chemists: Norwood, 0., U.S.A.

SCHWARZ LABORATORIES, INC.202 E. 44th Street, New York 17, New York

33

I

Personnel Placement

POSITIONS WANTED

Biologist: Man, Ph.D. Many years experience, including adminis-trative. Good organizer. Desire university or college teachingposition of greater responsibility. Zoology, general biology, ge-netics, embryology, entomology, histology. Some general andspecial botany. Available June or September. Good record. Box297A, SCIENCE.

Biologist: Ph.D. eastern university. Desires teaching position withopportunity for research. Only higher ranks considered. Tenyears successful college teaching. Research experience, micro-biology. Numerous publications. Veteran, married, family. Box295A, SCIENCE.

Chemical Engineer: Seeks teaching position in electrochemistryand chemical engineering. Of Chinese birth. Years of experiencein research, plant management and teaching in United States.Ph.D. Columbia 1925. Box 300A, SCIENCE.

Entomologist; bachelors degree with major in entomology, minorin zoology; masters with major in entomology minor in plantpathology; varied career in entomology, including teaching andresearch; for further information, please write Burneice Larson,Medical Bureau, Palmolive Building, Chicago 11.

Marriage and family life, criminal psychology, mental hygiene, mal-adjustment, social psychology, abnormal psychology. Academicposition desired by college professor, mature age, Ph.D., nowemployed, looking for better opportunity, available on agreement.Box 316A, SCIENCE.

Medical Abstractor, researcher, expert. Permanent or temporary.Formerly with E. R. Squibb & Sons. Published abstracts m

Medical Journal Abstracts. Box 313A, SCIENCE.

Physiologist-Zoologist: Ph.D. with twelve year record of suc-cessful teachiing in "A" medical school, good research record,seeks better post, perferably teaching-research post in medicalschool west coast or northeast. Box 309A, SCIENCE.

Protein Chemist, specializing in physical-chemical techniques (elec-trophoresis, diffusion, ultra-centrifugation, etc.) and experiencedin protein fractionation and isolation methods, is available asresearch consultant. Has well-equipped laboratory. Box 279A,SCIENCE.

Summer Teaching or Research position desired. University pro-fessor aged 30. Available from about June 10 to September 10when new job begins. Ph.D. biochemistry. Thorough training or-ganic and physical. Several years diversified experience collegeteaching. Box 315A, SCIENCE.

Zoologist: Ph.D. Twelve years academic and two years medicalschool teaching and research experience. Desires advanced posi-tion in teaching and research. Box 312A, SCIENCE.

Zoologist-Parasitologist: Ph.D., D.V.M.; ten years college and uni-versity experience in teaching, research and administration; tenyears government bureau experience in research and administration;70 publications, majority trematodes; would consider research andteaching in university or veterinary school, or administrative workin zoological sciences; now employed in administrative. researchand teaching position; desire more opportunity and fewer jobs inposition. Box 314A, SCIENCE.

POSITIONS OPEN

Physicists: Applications are invited for assistant and associate pro-fessorships in the department of physics, University of British Co-lumbia, Vancouver, B. C., Canada. Initial salary $3000 to $4100,depending upon qualifications. Duties will commence in September1948. These positions are open to young men who have not hadteaching experience. Enquires should be addressed to G. M.Shrum, Head, Department of Physics.

Personnel PlacementPOSITIONS OPEN

Assistant Control Bacteriologist for supervision of several tech-nicians in routine testing. Knowledge of pharmaceuticals de-sirable. Located in well-established mid-west pharmaceutical com-pany near large city. Box 289A. SCIENCE.

Plant Pathologist: To develop program of basic and applied fungi-cide research in state experiment station. Excellent living andworking conditions and opportunity for advancement. Rank andsalary contingent on training and experience. Box 303A,SCIENCE.

Positions Open: (a) Bacteriologist trained in parasitology to headthe department of bacteriology, university medical school; $6000.(b) Professor and head of department of physiology, Universitymedical school having important expansion program; should beinterested in developing department. (c) Research-physicist; 30-40 years old with industrial experience and particularly trained inuse of physical instruments such as the infra-red spectrometer;biological company; middle west. (d) Several chemists of Ph.D.level who are interested in doing independent research; researchinstitution now establishing an expanded group of organic chem-ists to work upon problems involving carbon-14; town of 40,000,few miles from university medical center. (e) Senior physiologistor pharmacologist; department of pharmacology, eastern pharma-ceutical company; recent graduate or one who will receive degreein June eligible; $4500-$6000; east. (f) Development engineerexperienced in pharmaceutical manufacturing duties involvemachine design and plant layout, methods and standards ofsupervision and other functions in growing drug manufacturingfirm; $5000-$7000. S5-2 Medical Bureau (Burneice Larson, Di-rector) Palmoliive Building, Chicago 11.

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Entire libraries, and smaller collections; sets and runs;foreign and domestic.

WALTER J. JOHNSON,125 East 23rd Street, New York 10.

Journals, Periodicals, Learned and scientific serials bought andsold. Complete or part sets, back volumes. J. S. CANNER &COMPANY, INC., 909 Boylston Street, Boston 15, Massachu-setts.

AAAS Symposia volumes are available as follows:Tuberculosis and Leprosy (133 pp), $3.00 ($2.50 to members)Human Malaria (406 pp), $5.00 ($4.00 to members)Liebig and After Liebig (119 pp), $3.00 ($2.50 to members)Aerobiology (299 pp), $4.00 ($3.50 to members)Relapsing Fever (136 pp), $3.00 ($2.50 to members)Mammary Tumors in Mice (231 pp), $4.00 ($3.50 to members)Dental Caries and Fluorine. (111 pp), $3.50 ($3.00 to members)Approaches to Tumor Chemotherapy (442 pp), $7.75 ($6.50 tomembers)

All volumes 7i/2 x 10/2, double column, illustrated, cloth bound.Send orders with remittance enclosed to Publications Division,AAAS, 1515 Massachusetts Ave., N.W.; Washington 5, D. C.

Send us your Lists ofSCIENTIFIC BOOKS AND PERIODICALS

which you have for sale.Complete libraries; sets and runs; and single titles are wanted.

Also please send us your want lists.STECHERT-HAFNER, INC., 31 East 10th Street, New York 3.

Need Review of Scientific Instruments, Vol. 1, numbers 3. 9, 10;Vol. 2, numbers 1, 3; Vol. 3, numbers 9, 12; Reviews of ModernPhysics, Vol. 5, Jan., July; Vol. 6, Jan., July, Oct.; Vol. 10,April; Instruments, Vol. 1, numbers 1, 3, 4, 11; Nature, Vol. 159,numbers 4027, 4028, 4029, 4033.Research Department, P. 0. Box 1407, Shreveport 92, La.

WANTED: Any of the following titles: Burns, Biological Stand-ardization; Van Oettinger, Therapeutic Agents of Pyrrole; Cum-ming, Systematic Organic Chemistry; May, Chemistry SyntheticDrugs; Thom, Penicillia; Hass, Chemistry Plant Products; Hol-lins, Synthesis Nitrogen Ring Compounds; Henry, Plant Alka-loids; Griffith, Rat in Laboratory; Clark, Mode of Action ofDrugs. Please reply to Librarian, Bristol Laboratories, Inc.,Syracuse 1, New York.

34

CHARGES FOR CLASSIFIED ADVERTISINGRegular setting 10¢ a word. Minimum charge $2.50 foreach insertion. A box number counts as 8 words of theadvertisement (e.g. 25 words plus box number equals 33words). Make checks payable to the AAAS. All inser-tions must be accompanied by correct remittance and sent10 days in advance of publication date to the AdvertisingDepartment, AAAS 1 Massachusetts Avenue, N.Washington 5, D. E.I

The Market PlaceBOOKS

Several issues of AAAS publications are now out of print. TheAssociation will be pleased to receive the following issues:SCIENCE-1947, Vol. 105: #2715, 2717 thru 2726, 2728, 2730thru 2737.THE SCIENTIFIC MONTHLY-1947, Vol. 64: #2, 3, 4, 5,and 6.Second class or parcel post postage will be refunded to thosedonating their spare copies of these journals. Address: AAAS,Attn: Mrs. H. Greenwald, 1515 Massachusetts Avenue, N.W.;Washington 5, D. C.

WANTED: A copy of Nouvelles Tables Trogonometriques Fonda-mentales (valeurs naturelles) by H. Andoyer. State price. Ad-dress: W. M. Stempel, Stevens Institute of Technology, Hoboken,N.J.

WANTEDJournal of American Chemical Society, Volumes 1 thru 55.Chemical Abstracts, Volumes 1 thru 9.Chemical Reviews, Volumes 1 thru 28 or 26 thru 28.Transactions of American Institute of Chemical Engineers,Volumes 1 thru 17.

Journal of Research of National Bureau of Standards, Volumes1 thru 38.

U. S. Patent Gazette, Volumes 1 thru 389.Canadian Journal of Research, Years 1945 thru 1947.Journal of Society of Chemical Industry (London), Years 1944

thru 1947.Send price and time of delivery on any or all of above items toLion Oil Company, Research Division, El Dorado, Arkansas.

FOR SALE: Chemical Abstracts, Journal ACS, Ind. & Eng.Chemistry, 1912-33. Science, 1922-40. Journal Bacteriology,1941-48. All unbound, excellent condition. Prices reasonable.Consider single volumes. Box 310A, SCIENCE.

FOR SALE: Science, Vols. 71, 73-106 and Societa Intern. Micro-biologia, Bol. Sez. Italiana, Vols. 3-7. Box 311A, SCIENCE.

The Market PlaceSUPPLIES AND EQUIPMENT

All Amino Acids (natural and synthetic, rare sugars, biochemicalproducts and reagents, new pharmaceuticals in stock. Write forcomplete price list. BIOS LABORATORIES, 607 West 43rdStreet, New York 18.

Amino Acid and protein analysis by microbiologic methods. Re-search problems on contract basis. SHANKMAN LABORA-TORIES, 2023 South Santa Fe Ave., Los Angeles 21, California.

Pre-Mized Microbiological Assay Media (One complete mixture):assay standards: pure amino acids (analysed): microbiologicalassays. H. M. CHEMICAL COMPANY, LTD., 144 NorthHayworth Avenue, Los Angeles 36, California.

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HERE IS . . . a textbook on lighting which presentsfundamental principles in a quantitative manner. Acomprehensive design method for practicing engineersin devising high-quality lighting systems for rooms.PROPER LIGHTING is of such vast importance to the-human race that there is no excuse for continuingthe haphazard design methods of the past. Tried andtested at the Massachusetts Institute of Technologyand at Tufts College, this book is of vital interest topracticing architects and engineers and to students.

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35

Index of Refraction Liquids for Immersion Meth-ods of Microscopy. Stable, non-volatile, certifiedliquids 1.400 to 1.700; high index liquids, above1.80, in preparation. Write for data 847-ND.

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I1

E & G MICROSCOPE LAMPThe E & G MICROSCOPE LAMP is a highly efficient, lowcost unit for precise transmitted, dark field, or oblique il-lumination. It utilizes an inexpensive 6.5 volt 2.75 ampereautomobile headlight type of bulb to give a high intensity,point source of illumination, and operates on 110 volt AC(only) current, with voltage reduced to 6 volts by a trans-former built into the base of the instrument. Therefore, itis undervolted to give unusually long bulb life and the propercolor temperature when used for color photography orphotomicrography.

forMICROSCOPY

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36

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