Library

SCIENCE eta72a~c

NEW SERIES SUBSCRIPTION, $6.00VOL. 86, No. 2229 FRIDAY, SEPTEMBER 17, 1937 SINGLE COPIES, .15

Newly Improved /THE B & L CLINICAL I

MWICROTOMWE

Here is a new Improved Clinical Microtome for the rapid and accuratesectioning of frozen, celloidin and paraffin materials. It incorporatesseveral exclusive features which provide the laboratory technicianwith the sectioning speed and accuracy which he has long desired.

Following are some of t/he features:1.A special CO, Freezing Attachment capable of handling 38 x 38mm. objects.

2. Uniform efficiency regardless of room temperature.

3. Readily interchangeable freezing attachment and object clamp.4. Section thickness from 5 to 50 microns in steps of 5 microns.

Improved Clinical Micro-tome Object Clamp for

Paraffin or CelloidinWork.

5. Improved Object Clamp.

You should have complete information on this clinical microtome.Details are contained in the new B & L Microtome Catalog D 16.Write for it to Bausch & Lomb Optical Co., 642 St. Paul St., Rochester,N. Y.

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2 SCIENCE-ADVERTISEMENTS 2229

DR. BRUNO LANGEUNIVERSAL

PHOTO-ELECTRICCOLORIMETER

rFOR rapid, objective measurements,I independent of the observer's visualacuity. Direct absorption and extinctionreadings for fluid measurements of 0.2-100 ccm. Measurements independent ofcurrent fluctuations by connecting twosemi-conductors in series. Ever readybecause of elimination of anode and heat-ing batteries. Color filters for absorp-tion determination of range spectra.Monochromatic measurements with so-dium vapor lamp. For a.c. or d.c., anyvoltage. No dark room required.

Price, with iris for 0.1-100% absorption,including measuring instrument with ab-sorption and extinction scales, 2 photo-cells,3 cuvettes (100 ccm) and 8 color filters, incabinet ... $225

Particulars on request

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2 SCIENCE-ADVERTISEMENTS VOL. 86, NO. 2229

SEPTEMBER 17, 1937 SCIENCE-ADVERTISEMENTS 3

PRECISION

INCUBATION

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Castle "554" Incubator

The Castle "554" is especially favored by bac-teriological and scientific laboratories where pre-cision of control and constant uniformity oftemperature are absolutely necessary. A Castleis a guarantee of absolute precision with neverso much as a degree variation between top andbottom of the chamber when loaded. TheCastle "554" is triple walled with water jacket,which accounts for the unusually accurate re-sults. No space in the chamber is wasted byheaters or controls . . . the space is 98%usable.

FeaturesTriple walled ... Water Jacketed.. . Even distribution of heat byradiation-no cold spots . . . Con-stant humidity ... Thorough ven-tilation without cooling.

WRITE FOR INCUBATOR BULLETIN

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Supplied in attractive carrying case.WRITE FOR DESCRIPTIVE BULLETIN

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4 SCIENCE-ADVERTISEMENTS VOL. 86, No. 2229

The Standard forMicroscope Glass

Gold Seal

MicroscopeSlides andCover GlassesCrystal ClearNon-CorrosiveWill Not Fog

Gold Seal Slides and Cover Glasses are made from a glasspractically free from alkali. They attain a precise uniformity ofthinness and plane surface that is unparalleled. They are bril-liantly crystal clear and guaranteed against corrosion, foggingor any imperfection.Microscopic work deserves the best-specify Gold Seal Slidesand Cover Glasses, priced only a trifle more than inferiorgrades.

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CHAOS CHAOSThis, the largest ameba known to science,

was first discovered in Germany in 1755 andhas been found only five times since then.In 1936 Doctor A. A. Schaeffer rediscoveredit in a marsh in New Jersey and succeededin establishing pure cultures. Chaos chaosis of great size, being 50 to 500 times as largeby volume as the ordinary laboratory ameba,and in locomotion it frequently attains alength of two to five millimeters. It iseasily seen with the naked eye and is idealfor general laboratory study.Doctor Schaeffer has designated General

Biological Supply House, Inc. as exclusivedistributor for pure cultures of this ameba.Orders should be placed in time to allow oneweek in which to make delivery.1V1O Chaos chaos, Type A, Schaeffer strain.

Pure culture contain.ng from 60 to 100amebas. . $3.50

Biological MaterialThat the General Biological Supply House is the

largest company in the United States preparingand dealing in biological materials exclusively isdue largely to the fact that it devotes its entireefforts to just one end-the preparation of the bestpossible biological materials. Modern laborato-ries, a highly trained staff, many years of experi-ence, and a sincere desire to serve the Biologist, allcombine to assure you of uniform dependability inTurtox Products.

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4 SCIENCE-ADVERTISEMENTS VOL. 86, NO. 2229

SETME 17 197SIN EA V RIE E T

OPTICAL QUALITYIs Required in Medicine

* Throughout the country, in hospitals and biological labora-tories, thousands of Spencer Microscopes, prized for their su-perior optical performance, are aiding in the battle againstdisease.

Each year, as hundreds of young men and women undertakethe study of medicine, they are advised to "Purchase a Spen-cer Microscope".The reason for this preference is the Spencer optical quality,planned in the optical formula of each instrument and carriedout in the superior craftsmanship of Spencer construction.

Spencer Lens CompanyMICROSCOPES REFRACTOMETERSMICROTOMES L COLORIMETERSPHOTOMICROGRAPHIC | frALO SPECTROMETERSEQUIPMENT , PROJECTORS

SEPTEMBER 17, 1937 SCIENCE-ADVERTISEMENTS 5

6 SCIENCE-ADVERTISEMENTS

Application of a Stimulusand

Record of the. EventNot only require dependable instruments but demand, for the class laboratory, instru-ments of time-saving convenience, low upkeep and moderate cost.

The Platinum Electrodes aredesigned to meet such needs.Points can be removed orreplaced instantly. The con-struction is for maintenanceunder prolonged service.Silver points are furnishedwhen specified.

The Signal Magnet, as anecessary companion in-strument, should be capa-ble of ready adjustmentfor range and sensitivity.The form illustrated(the "27 mm." type) isstrongly protected, quick-acting and provided with a special base-control screw for thevibrator. This last device will be appreciated especially by instructors in charge oflarge classes, where magnets in number must be kept in simultaneous operation.

We are also prepared to furnish:An Electrode Holder with flexible arm arranged for clamping to the stand.A Magnetic Signal (the "10 mm. Magnet") adaptable as a relay, a 'make'cut-out, or a drop recorder. The interchangeable tuned vibrators providetime records from alternating current.

The Harvard Apparatus Company, Incorporated(For the advancement of teaching and research in Physiology and Allied Sciences)

Dover, Massachusetts or Back Bay Post-Office, Boston

.l

VoL. 86, No. 22296 SCIENCE-ADVERTISEMENTS

VOL. 86, No. 2229

one containing ordinary tap water and the other thesolution used in hydroponics; 100 cc of a culture ofAnkistrodesmus was added to each jar. Weekly deter-minations were made on each aquarium, the water orsolution taken out being replaced each time and theloss due to evaporation made good by the addition ofthe tap water. One liter was run through a Foerstcentrifuge and the organic matter determined by losson ignition; a half liter was centrifuged for planktoncounts. Methyl orange alkalinity, free carbon dioxidedissolved oxygen and pH determinations were made.A 14.0 cm length of Elodea was placed in eachaquarium and the gain in length determined weekly.At the conclusion of the experiment the plants weredried and ashed to determine the organic matter ineach.

The results expressed graphically are shown in Fig.1. The graphs show strikingly the comparatively

FIG. 1. Organic matter, plankton and chemical changesin aquaria containing hydroponics solution and control.

Organic matter shown as milligrams per cubic 'meter;plankton as the number of individuals per liter, total verti-

cal height represents fertilized aquarium, central unshadedportion the control; chemical figures in parts per million.Solid line represents fertilized aquarium, the broken linethe control.

slight chemical changes in the control compared withthe marked activity of the fertilized aquarium. In

presenting the results of the plankton counts Loh-man's spherical method was employed in order tobridge the extreme range between minimum and maxi-mum numbers. The control ranged from 440,000 indi-viduals per liter at the start to 440 million at itsmaximum, while the range in the fertilized a.quariumwas from 560,000 per liter to over 6 billion. Daphniashould be introduced after the first week or two or assoon as the culture becomes a decided green. In thepresent experiment the algae were allowed to multiplyunchecked for six weeks, and at the end of that time,in fact long before it, the aquarium containing theculture medium was a very dark opaque green, whilethe control was barely tinged with a greenish color andperfectly transparent. The Elodea plants made theirmost rapid growth during the first part of the experi-ment due largely to the increasing green color in theculture solution and to the exhaustion of food fromthe control water. At the end of six weeks the plantin the culture was 32 cm in length and the control 25cm; the condition of the two plants, however, showedgreat differences, the control being a sickly pale colorwith very short leaves on its terminal portion and noroots, while the other plant showed vigorous darkgreen leaves and numerous roots. The organic matterof the control amounted to 156.06 milligrams and thatof the other plant 242.51 milligrams. It should bepointed out here that no soil was placed in either jarand this fact contributed to the very poor growth ofthe control plant.

WILLIS L. TRESSLERTHELMA WILLIAMS

BIOLOGY DEPARTMENT,UNIVERSITY OF BUFFALO

BOOKS RECEIVEDALDRICH, JOHIN W. an1d BENJAMIN P. BOLE, JR. The

Birds and Mammals of the Western Slope of the AzueroPeninsula. Pp. 196. Cleveland Museum of NaturalHistory.

BENJAMIN, A. CORNELIUS. An Introduction to the Phi-losophy of Science. Pp. xvi + 469. Maemillan. $3.50.

DANTZIG, TOBIAS. Aspects of Science. Pp. xi + 285.MacInillan. $3.00.

DITMARS, RAYMOND L. The Making of a Scientist. Pp.xii+0258. 41 photographs. Macmillan. $2.75.

FINDLAY, ALEXANDER. A Hundred Years of Chemistry.Pp. 352. Macmillan. $4.25.

HEWITT, J. N. B., Editor. Journal of Rudolph FriederichKurz. Translated by MYRTIS JARRELL. Pp. ix + 382.Bureau of American Ethnology, Bulletin 115. Smith-sonian Institution. $0.60.

KLINEFELTER, LEE M. Electrical Occupations for Boys.Pp. 227. Illustrated. Dutton. $2.00.

LIPS, JULIUS. The Savage Hits Back. Pp. xxxi+254.213 figures. Yale University Press. $5.00.

STAGNER, Ross. Psychology of Personality. Pp. xi + 465.24 figures. McGraw-Hill. $3.50.

VAN DEN BERGH, GEORGE. Astronomy for the Millions.Pp. xii+370. 18 plates. 34 figures. Dutton. $3.50.

VIOSCA, PERCY, JR. Pondfish Culture. Pp. xxiii + 260.68 figures. Pelican Publishing Co., New Orleans. $4.00.

274 SCIENCE

SETME=7 97SIN EA V RIE E T

Three Important New Books

Macleod and Nason-Chemistry and Cookery. New second editionBy ANNIE LOUISE MACLEOD and EDITH H. NASON, Syracuse University. McGraw-HillEuthenics Series. 551 pages, $3.50.

In the past six years Chemistry and Cookery has established a record of widespread and successfuluse. Teachers liked the book because it gave a concise, readable presentation of present-day chemi-cal theory and its application to the study of foods. Now, in the second edition, the entire book hasbeen completely revised and largely rewritten in the light of changing trends in chemistry. Thenew theories on the behavior of electrolytes in solution are included; all the material on foods hasbeen brought up to date; additional laboratory experiments, especially on foods and colloids, havebeen added.

Maynard-Animal NutritionBy LEONARD A. MAYNARD, Cornell University. McGraw-Hill Publications in the Agricu,l-tural Sciences. 471 pages, $4.00

This book inaugurates a new series, McGraw-Hill Publications in the Agricultural Sciences, of whichLeon J. Cole, University of Wisconsin, is consulting editor. The purpose of Animal Nutrition isto present the principles of nutrition and their applications with special reference to the feeding offarm animals. The essentials of nutritional chemistry and physiology are dealt with and particu-lar attention is given to the contributions of the newer knowledge of nutrition to feeding practice.A special feature of the book is the large number of carefully chosen references. Throughout thetext the methods by which the newer knowledge of nutrition is being gained are illustrated by thepresentation of typical experimental data.

Sherbon-The Family in Health and in IllnessBy FLORENCE BROWN SHERBON, M.D., Department of Home Economics, University ofKansas. McGraw-Hill Euthenics Series. 493 pages, $3.00

In this interesting new book Dr. Sherbon seeks to integrate, from a practical, scientific point ofview, the specific health aspects of the life of the family group. Every effort has been made to givethe student a realization that all science should interpret and add interest to personal living; a newinterest in and respect for the human body; a new sense of obligation to achieve perso'nal healthand an increased sense of responsibility for the health of the family; and an intelligent conceptionof the causes of deviation from health and of the proper management of illness. There is a fullcoverage of the subjects of invalid occupation and improvisations for illness; a thorough treatmentof ordinary accidents and emergencies; and full instructions for carrying out any sickroom pro-cedure likely to be required of the average homemaker.

Send for copies on approval

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McGRAW-HILL BOOK COMPANY, INC.

SEPTEMBER 17) 1937 SCIENCE-ADVERTISEMENTS 7

Aldwych House, London, W.C.2

SCIENCE-ADVERTISEMENTS

SELECTED REFERENCE BOOKS *Add these to your personal or department library NOWto have them the whole semester for

* source material and further reading .

HOME ECONOMICSMarriott's-INFANT NUTRITIONBy W. McKim Marriott, B.S., MI.D., Professor of Pedi-atrics, Washington University School of Medicine, St.Louis. 2nd edition; 431 pages; 27 illustrations, price$4.50.

Zahorsky's-SYNOPSIS OF PEDIATRICSBy John Zahorsky, A.B., M.D., F.A.C.P., Professor ofPediatrics and Director of the Department of Pedi-atries, St. Louis University School of Medicine, St.Louis. Assisted by T. S. Zahorsky, B.S., M.D., In-structor in Pediatries, St. Louis University School ofMedicine, St. Louis. 2nd edition; 367 pages; 89 illus-trations; price $4.00.Zahorsky's-PEDIATRIC NURSINGBy John Zahorsky, A.B., M.D., F.A.C.P., Professor ofPediatrics and Direetor of the Department of Pedi-atrics, St. Louis University School of Medicine, St.Louis. 568 pages; 151 illustrations; price $3.00.

BACTERIOLOGYFairbrother's-TEXTBOOK OF MEDICALBACTERIOLOGY

By R. W. Fairbrother, D.Sc., M.D., M.R.C.P., Lecturerin Bacteriology, University of Manchester; Late Re-search Fellow in Bacteriology, Lister Institute, Lon-don. 437 pages; 12 illustrations, 4 color plates, 34tables; price $4.50.

Sherwood's-IMMUNOLOGYBy Noble Pierce Sherwood, Ph.D., M.D., Professor ofBacteriology, University of Kansas. 608 pages; 35illustrations; price $6.00.

Gradwohl's-CLINICAL LABORATORYMETHODS AND DIAGNOSIS

By R. B. H. Gradwohl, M.D., Director of the GradwohlLalboratories, St. Louis. 1028 pages; 352 illustra-tions; price $8.50.

Bray's-SYNOPSIS OF CLINICALLABORATORY METHODS

By W. E. Bray, B.A., M.D., Professor of Clinical Pa-thology, University of Virginia. 324 pages; 43 illus-trations; price $3.75.

THE C. V. MOSBY COMPANY

PHYSIOLOGYMacleod's-PHYSIOLOGY IN MODERNMEDICINE

By J. J. R. Macleod, M.B., LL.D., D.Sc., F.R.C.P.,F.R.S., Regius Professor of Physiology in the Univer-sity of Aberdeen, Scotland, Formerly Professor ofPhysiology in the University of Toronto, Canada, andin the Western Reserve University. 7th edition; 1154pages; 297 illustrations; price $8.50.

BOTANYDodge's-MEDICAL MYCOLOGYBy Carroll William Dodge, Ph.D., Professor of Botany,Washington University, St. Louis. 832 pages; 142illustrations; price $10.00.

PSYCHOLOGYSadler's-THEORY AND PRACTICE OFPSYCHIATRY

By William S. Sadler, M.D., Chief Psychiatrist andDirector, The Chicago Institute of Research and Diag-nosis. 1231 pages; price $10.00.

Mason's-WHY WE DO ITBy Edward C. Mason, M.D., Ph.D., F.A.C.P., Professorof Physiology, University of Oklahoma School of Medi-cine. 177 pages; price $1.50.

Clark's-EMOTIONAL ADJUSTMENT INMARRIAGE

By LeMon Clark, M.S., M.D., Assistant in Obstetricsand Gynecology, University of Illinois, College of Medi-cine. 261 pages; price $3.00.

Kempf's-PSYCHOPATHOLOGYBy Edward J. Kempf, M.D., Clinical Psychiatrist toSt. Elizabeth 's Hospital, Washington, D. C. 762pages; 87 illustrations; price $5.50.

Purves-Stewart's-THE DIAGNOSIS OFNERVOUS DISEASES

By Sir James Purves-Stewart, K.C.M.G., C.B., Knightof Justice Order of St. John of Jerusalem, M.D., Edin.F.R.C.P., Senior Physician to Westminster Hospital.7th edition; 730 pages; 312 illustrations; price $6.50.

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SEPTEMBEP. 17, 1937 9