SCIENCE-ADVERTISEMENTS 9

For the Physiological LaloratoryELECTRODES WITH UNIVERSAL FLEXING ARM

Flexible Electrodes with Holder and adjustments-one-fourth the actual size.

Electrodes. With silver or platinum tips, quickly interchange-able. Handle and cord durably coupled. $2.25, $2.80.

Electrode Holder. A lead flexing arm supports the electrodes ina screw-clip. A binding screw fixes the arm within a tubularmounting rod: by this means the lead wire can be promptly short-ened or renewed. $1.30.

Adjusting Clamp. Slow motion governed by a knurled headand swivel action by a set-screw. $3.75.

Stand with Adjusting Screw. Rotation of post through 450 byan adjusting head on the semicircular base. $5.50.

Each of these devices may be obtained separately, prices subjectto change. Write for our Catalogue. of Physiological Apparatus

The HARVARD APPARATUS COMPANY, IncorporatedDover, Massachusetts

[A Massachusetts non-profit corporation, organized for the advancement of teaching and research inphysiology and allied sciences.]

NovEmBER. 23, 1945

SCIENCE-SUPPLEMENT VOL. 102, No. 2656

SCIENCE NEWSScience Service, Washington, D. C.

INFLUENZA VACCINEINFLUENZA vaccineof the kind now being given to all

Army personnel will be available for civilian use by

December 1 or shortly after.The vaccine is effective against Types A and B in-

fluenza. These are the types which have caused epidemics

in recent years. Other types of influenza virus exist.

Authorities do not know whether the world-wide influenza

epidemic in 1917-1918 was due to A or B virus or to

some other type.Army studies, prior to the general vaccination order,

showed that about 75 per cent. of those vaccinated were

protected against influenza during outbreaks which oc-

curred soon after the vaccination. How long the im-

munity, or protection, lasts is not definitely known.The vaccine is given by hypodermic injection under the

skin of a single dose of one cubic centimeter (about one

fourth of a teaspoonful).Civilians whose physicians advise them to be vaccinated

will find that the vaccine is expensive. Actual manufac-turing costs are about 50 cents to one dollar per dose.Retail costs may be three to five times as much.The vaccine is made from influenza virus grown on

chick embryo. The following firms have been manufac-turing the vaccine: Lederle, Squibb, Sharp and Dohme,Lilly, Pitman-Moore and Parke-Davis. Some manufac-turers have already applied to the National Institute ofHealth for licenses to manufacture the vaccine forcivilian use. Others will doubtless make similar requestssoon and it is expected that firms which have not yetmade the vaccine may do so in the future.

Influenza at present shows no signs of becoming epi-demic this winter. Cases reported to the U. S. PublicHealth Service since January 1 total about 85,000 com-

pared to some 350,000 for the same period last year.

Some widely scattered small outbreaks last spring ledArmy medical officers at that time to anticipate an epi-demic this winter. Although it has not yet materialized,the possibility at that time led to plans for vaccination

of all personnel as soon as sufficient vaccine was avail-

able. By October there was enough of the vaccine to

order general vaccination during October and November.

ITEMS

THE formation of an interim educational, scientificand cultural commission, consisting of the representa-tives of 15 governments, to bridge over the gap until a

United Nations Educational, Scientific and Cultural Or-

ganization is fully established has been suggested bythe United States delegation to the organization meetingof the UNESCO in London. Another interim commission

to examine the problem of controlling atomic research was

proposed by the Belgian representatives. Professor G.

Magnel, civil engineer from the University of Ghent,states that the Belgian proposal would involve the inspec-tion of all nuclear research laboratories by an inspectionservice to be set up by each government, which would then

report its findings yearly to UNESCO.

NEW treatments for disease are hoped for through use

of plants and herbs expected to be discovered by a Soviet

medical expedition in the mountainous Altai region of

central Asia. The sending of several expeditions to this

area has been announced by the U.S.S.R. Academy of

Medical Sciences through its secretary, Professor V. V.

Parin. Other inquiries under way include a survey of

the health conditions in the regions that were occupied

by the Nazis. In all, 30 medical expeditions are in thefield.

A MODEL of an engine, claimed to be the simplestengine in the world to-day, was demonstrated recentlyat the Polytechnic Institute of Brooklyn by ZygmuntFonberg, the Polish rocket expert and inventor of thefirst bazooka in Poland prior to the war. It is a ram

jet motor of new and unusual design. This new enginewas designed to help launch gliders into the air. It con-

sists of a cylindrical tube, which appears to be just an

empty pipe, mounted on a restraining structure whichhas a free moving arm to permit the engine to swing in a

circle around it when in operation. The lining of thetube expands from a smaller diameter in the front endto a larger diameter at the other end. The space on

either side of the lining and the outer wall contains thegas which runs into a nozzle at the forward end of thecylinder. Air mixes with the gas coming through thesmall holes of the nozzle during combustion, thus pro-

viding the force of propulsion.

IN Soviet Russia, 3,900 scientists were graduated fromthe colleges with the degree of doctor in the years 1937to 1944; about 20,000 received a master's degree, accord-ing to Joseph Agroskin, vice-chairman of the Committeeon Higher Education in Moscow. The Soviet Governmenthas been paying particular attention to the matter oftraining scientists because of the pressing need for teach-ers of technical subjects in the colleges due to greatlyincreased student body. In 1929, there were only 26,000engineers with diplomas in all the heavy industries of

Russia. But in the last six years, about 80,000 engineerswere graduated. In pre-revolutionary Russia, Vice-Chair-

man Agroskin said, higher education was for the privi-leged few of the upper strata. In 1914, Russia had only91 colleges with 112,000 students. The Soviet Govern-

ment placed the entire system of higher education on

new principles. Nationality and class distinctions were

abolished. Education was free. All nationalities were

permitted to teach in their own languages in colleges on

the territory ,of their own national republics. Both uni-

versities and institutes were opened to all working people.As a result, there are now 772 colleges with 562,000students. Of these 132 are industrial institutes, 18 trans-

port institutes, 87 agricultural institutes, 68 medical

institutes, 115 pedagogical colleges and 29 universities.

In 1925, Vice-Chairman Agroskin reported, there were

only 17,900 professors and lecturers in all Russia's col-

leges. Now there are 40,000.

10

NOVEMBER 23, 1945 SCIENCE-ADYERTISEMENT. 11

SUCCESSFU PHSIS TEXTS

DUFF (Editor) Physics-8th EditionEdited by A. WILMER DUFF, Sc.D., Worcester Polytechnic Institute.

This is the textbook of choice for the use of students in engineering and in the sci-ences. It was prepared by a group of eminent teachers of physics to meet theactual teaching problems and necessities of the day. Clearness and accuracy ofscientific facts, simple and direct style, avoidance of obvious explanations, correla-tion of the illustrations with discussions, ample choice of problems in each chapterand a supplementary group at the end of the book-these are some of its featureswith definite pedagogical value.630 Illus. 715 Pages. $4.00

FOLEY College Physics-3rd EditionBy ARTHUR L. FOLEY, PH.D., Emeritus Professor of Physics, Indiana University.Widely used for the beginning student in colleges of liberal arts and science, thistext is notable for its intelligible discussion of those topics that have meaning andinterest in the life and experiences of the student. It gets and holds the attentionby a straight-forward and conversational style. The helpful suggestions of manyteachers using the book have been utilized in preparing this edition. The manythousands of cross-references, forward and backward, enable the instructor topresent the work in any order desired. Answers to alternate problems are given.470 Illus. 757 Pages. $3.75

STRANATHAN-The "Particles" of Modern PhysicsBy J. D. STRANATHAN, PH.D., Professor and Chairman of the Department ofPhysics, University of Kansas.

The study of modern physics is moving forward by great strides and is acceleratedby the practical application of the material. This book is essential to an appreci-ation of the subject and an understanding of the modern concepts of atomic struc-ture. Experimental evidence for the fundamental concepts is stressed throughoutand numerous references to original work are given in the literature. Wellselected problems are included. The course can be followed by the average stu-dent in general physics.218 Illus. 571 Pages. $4.00

I THE BLAKISTON COMPANY12E- PHILADELPHIA 5, PA..

NovEMBER. 23, 1945 SCIENCE-ADVERTISEMENTS 11

101 2 WALNUT STREET

12 SCIENCE-ADT7ERTISEMENTS VoL. 102, No. 2656

'particularly timely"

* . . . . . PRINCIPvrLESOFINDUSTRIAL PROCESS CONTROL

By DONALD P. ECKMAN, Development EngineerBrown Instrument Company

* Just published, this thorough, practical and comprehensive treatment of the theory of auto-matic control has already received enthusiastic praise from physical chemists, physicists and teachers.Here are typical comments: `ea fine piece of work"- splendid compilation of much needed in-formation"-"very interesting and very informative"-"ecovers subject matter material which is.not found in any other book-'-"comprehensive and authoritative."'

0 Information for the most part previously scattered throughout the technical literature is herecoordinated in a clear and logical manner. Subjects covered include measuring characteristics ofcontrollers, the effect of process load changes, the effect of valve characteristics, and correlated ormultiple control systems. Although many simple devices are described, the emphasis throughoutthe book is placed on theory rather than mechanics.

September, 1945 237 pages 558 by 858 $3.50

AERIALNAVIGATIONBy H. E. BENHAM, Director of Ground Training,

Pan American-Grace Airways, Inc.

Designed to provide students of aerial naviga-tion with a practical textbook for use in theirstudy of a practical science, this book featurescurrent practice and explains the latest tech-niques in the field. Simply written, conciseand beautifully illustrated.

(November, 1945)344 pages; 558 by 858; $4.00

ELECTRON OPTICS AND THEELECTRON MICROSCOPE

By V. K. ZWORYKIN, G. A. MORTON,E. G. RAMBERG, J. HILLIER, A. W. VANCE;

All at RCA Laboratories, Princeton, N. J.

This comprehensvie book covers the electronmicroscope in all its phases. It is intended toaid the present or prospective electron micros-copist in understanding his instrument and inusing it to greatest advantage, and to providethe knowledge which must form the basis forprogress in microscope design.

(December, 1945)Approx. 747 pages; 558 by 85/8;

Probable price $10.00

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

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12 SCIENCE-ADVERTISEMENTS VoL. 102, No. 2656

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SCIENCE-ADVERTISEMENTS

HOEBER TEXTBOOKS

THIENES' FUNDAMENTALS OF PHARMACOLOGYnew!

"A concise, comprehensive textbook on pharmacology," J.A.M.A. says of this newbook by PROF. CLINTON H. THIENES, Univ. Southern Calif. Medical School. "Itis clearly written, up to date. Some features appealing to students are the briefintroduction to each section, uniform exposition of each drug, and differentialanalyses of drug actions. Serves well to introduce students to the essentials."535 pp., 36 illus., $5.75.

EVERETT'S MEDICAL BIOCHEMISTRY standard!

Reflecting his years of teaching experience, PROF. MARK R. EVERETT of the Uni-versity of Oklahoma Medical School has written a highly successful biochemistrytext. " Clarifies in a simple way the relation of biochemistry to medicine and itsproblems. Should go far to make the subject attractive and understandable."-J. Assoc. Amer. Medical Colleges. 708 pp., 103 tables & charts, $5.75.

FOWLER'S HEMATOLOGY just out!

The new hematology text, guide to the modern treatment of blood diseases. Inclear easy terms PROF. WILLIs M. FOWLER, Univ. Iowa Medical School, describesthe hematopoietic system in health and disease. Latest material on every neededtopic is included: on cell types and growth, anemias, effects of infections, trans-fusions, blood derivatives, etc., and the most satisfactory laboratory methods.550 pp., 110 illus., 8 full color pp., $$.00.

MAINLAND'S ANATOMY new!

"There's much in this new text beyond dry bones. On every page the activitiesof the living body are used to explain and enlarge what dissection reveals. A finecontribution to medical pedagogy, demonstrating the role of anatomy in a practi-tioner's practical education.'"-Calif. & Western Med. BY PROF. DONALD MAIN-LAND, Dalhousie Univ. Medical Faculty; 880 pp., illus., $7.50.

PAUL B. HOEBER, INC.Medical Book Dept., Harper & Brothers

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14 SCIENCE-ADVERTISEMENTS VOL. 102, No. 2656~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

U

Exposure Determinationin Photomicrography

by direct light measurement in plane of image

PHOTOVOLT Electronic Photometer MOD. 512Also suitable for spectrophotometry, densitometryof spectrographs and X-ray diffraction negatives,measurement of luminescence and fluorescence,ultraviolet radiation and absorption.

Now available with interchangeable search units, forinfra-red, visible, ultraviolet as far as 200 millimicrons.

Write for literature

PHOTOVOLT CORP.95 Madison Ave. New York 16, N. Y.

SARCEAU ELECTROENCEPHALOGRAPHSA.C. Operated No Batteries

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THE JUNIOR GARCEAUELECTROENCEPHALOGRAPH

A simplified inexpensive instrument for recording electricalpotentials of the brain. Built-in interference eliminatorspermit use anywhere. Inkless records-no photographyor film-development required. Instantaneous localizationwith any 2 of the 10 leads.

All Garceau Electroencephalographs operate en-tirely from the 115 volts, 50 or 60 cycle power lines.

ELECTRO-MEDICAL LABORATORY, INC.HOLLISTON, MASSACHUSETTS, U. S. A.

KLETTELECTROPHORESIS

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VOL. 102, No. 265614 SCIENCE-ADVERTISEMENTS

SCIENCE-ADVERTISEMENTS 15

This new, improved Stokes Patented(McLeod type) Vacuum Gage pro-vides rapid (2 to 5 seconds) readingswithin the micron range with perma-nent accuracy under all conditions. Itdoes not require calibration againstother gages and retains its accuracyin the presence of all gases includinghydrogen, and condensable vapors in-cluding water and oil.These gages are compact, rugged,convenient to use as portable instru-ments or on fixed mountings. Theyare widely used in physics, organic andphysical chemistry laboratories and byIndustry . . . for applications such asdrying blood plasma, penicillin and bi-ologicals from the frozen state, organicdistillation under higher vacuum thanheretofore (in which ordinary closed-end manometers are not adequate) andfor testing efficiencies of vacuum meth-ods, apparatus and systems.

THOUSANDS IN USE

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BARCROFT-WARBURG APPARATUS

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Same as above but for 14 determi-nations .................. ................ ...$710.00

The J. H. Emerson Company was the first toput the Barcroft-Warburg apparatus on the U. S.Market and first advertised it in Science in De-cember, 1929. Since that time we have sold thisequipment to many outstanding institutions, in-cluding:

Univ. of California Mass. Inst. TechnologyUniv. of Chicago Calif. Inst. TechnologyUniv. of Wisconsin Cornell Medical CollegeYale Univ. Tufts CollegeHarvard Univ. Presbyterian HospitalPrinceton Univ. Iowa State Univ.Ohio State Univ. Louisiana State Univ.Northwestern Univ. Duke Univ.New York Univ. Columbia Univ.

Leland Stanford Univ.

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ORIGINAL DESIGNERS AND MANUFACTURERSOF THE MODERN DIAPHRAGM TYPE "IRONLUNG," THE EMERSON RESUSCITATOR, ANDOTHER MEDICAL AND HOSPITAL EQUIPMENT.

NovigmBER.' 23,' 1945.

16 SCIENCE-ADVERTISEMENTS VoL. 102, No. 2656

accuratee linear measurements of

GAERTNERMICROMETER SLIDES

fitted with microscope or telescope, permit-

depth mearement

tertioal micrometer

measurements focusingA most desirable feature of these instruments is the diversity of applications possible. In addition to the uses

Indicated, displacements on small objects can be measured by mounting them directly on the slide. Two slidescan be mounted to form a small coordinate comparator. Various types of microscopes and supports are availablefor other adaptations.

RANGES: up to 4 Inches (100 mm) . READINGS: to .00005 inch (0.001 mm)

THE GAERTNER SCIENTIFIC CORPORATION1204 Wrightwood Avenue Chicago 14, U. S. A.

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UEBIG AND AFTER LIEBIGA Century of Progress mAgricultural Chemistry

A symposium organzed and presentedby the Section on Chemistry of the Aso-ciation under the direction of a specialcommittee: Charles A. Browne, RichardBradfield, and Hubert B. Vickery. Thereare four papers under the heading of Or-ganic Chemistry, Enzymes and Nutritionand five under the heading of Soils, Ferti-lizers and the Mineral Requirements ofPlants.

vil + ill pages (7 x 1j),14 illustratin, references, cloth binding;

publnhed in 1942Price, $2.50; price to non-members

of the Association, $3.00.American Association for the

Advancement of ScienceSmithsonian Institution Building

Washington 25, D. C.

16 SCIENCE-ADVERTISEMENTS VoL. 102, No. 2656

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NOVEMBER 23, 1945 SCIENCE-ADVERTISEMENTS 17~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kodak Materials for Spectrum Analysis

A MONG the wide range offilms and plates that the EastmanKodak Company manufactures for spectrography, four are

specially made for spectrum analysis. They are: Kodak Spec-trum Analysis No. 1 and No. 2 Films (35mm.), and KodakSpectrum Analysis No. 1 and No. 2 Plates.

Information concerning these and some other materials isgiven in a new booklet, Kodak Materials for Spectrum Analy-sis. It contains technical data of particular interest for spec-

trum analysis, including gradient-wave length and time-gammacurves, granularity tracings, and data on the resolving power

of the materials.Copies of this booklet will be furnished free on request.

EASTMAN KODAK COMPANYResearch Laboratories Rochester 4, N. Y.

-LaMotte Outfit fordetermination of Vitamin A

The Importance of,igrading fish oils andp\ :r0 ( - similar materials ac-

cording to the vita-min A content hasdemanded a simyjle9means of determin-

X ing vitamin A. This| La otte outfit em-

ploying the methodof Dr. B. E. Oserprovides a reliablechemical procedureto meet this need.Complete with colorstandard special com-parator, reagents andfull Instructions.Price $35.00 f.o.b.Towson.

Determine Vitamin C in Blood,Urine, Fruits, Vegetables

The new LaMotte Outfit employs 2-6 DichlorophenolIndophenol in handy tablet form, two color standardscovering the high and low values, together with neces-sary calibrated glassware and reagents. This test isdesigned for the quick and efficient analysis of VitaminC in fasting blood of patients, within the wide rangeof 0.5 mg. to 1.8 mg. per 100 cc. Price complete$22.50 f.o.b. Towson.

LaMotte Chemical Products Co.Dept. "H" Towson 4, Baltimore, Md.

Bacto-AgarBacto-Agar is a purified

Agar prepared from domes-tic material. In the manu-facture of Bacto-Agar ex-traneous matter, pigmentedportions, and salts are re-duced to a minimum, so thatthe finished product in theform of fine granules willdissolve rapidly, giving clearsolutions.

DIFCO LABORATORISINCORPORATEDDETROIT 1, MICHIGAN

11

NovFmBFa 23, 1945 SCIENCE-ADVERTISEMENTS 17

SCIENCE-ADVERTISEMENTS VOL. 102, No. 2666

The Catalog CornerPlease write directly to the company Indicated for any publication you wish number

SCIENCE. Publications are gratis unless otherwise noted.

COMPANY PUBLICATIONS ington, or they may be

order from the Department. Index No. 1 of AvailableIndustrial and Scientific Techncial Reports SC-l1.The Office of the Publication Board, Department ofPetroleum News. The organizational publication of Commerce, Washington 25, D. C.

The Sun Oil Company of Toledo is called Our Sun.

In this magazine the Company gives the latest infor-

mation about its products and the activities of its

personnel. The editor is George J. Bauer. Copies

may be secured by writing: The Sun Oil Company,

Toledo, Ohio.

New Technical Publications. To announce new tech-

nical publications as they appear, the McGraw-Hill Correction. In the last Issue of The Catalog Corner,Book Company publishes periodically Technical Edu- brochure Enlarging i8 Thrilling, published by thecation News, edited by Ruth Lawyer. In addition to Federal Manufacturing and Engineering Corporation,news about the company's books and the men who 2)17 Steuiben Street, Brooklyn 5, New York, did notwrite them, there are short articles about develo a75ments in technical and scientific Institutions. Tec wn iasti rhesponi ble e ifCompies

Education News, SC-. The MGraw-Hill Booknowise responsible for this error and if copesCompany, 330 West 42nd Street, New York 18, New are requested, the 25 cents should be sent with the

York. order.

News About New Plastics. The Plastics Division of pH Measurement Equipment. The Gamma Instru-

American Cyanamid Company has just released the ment Company Just released a new bulletin

first Issue of Plastics Newsfront, a magazine dealing scribing Its of pH meters.

with applications of moulding compounds, resin ad- pH Automat circuit, while based on the Poggendorfhesives, and laminating resins. The new publication voltage compensating principle, has the additional ad-

which Is printed In four colors, is a profusely illus- vantage of being compensated electronically, thustrated, non-technical presentation of new plastic de- eliminating mechanical adjustments. The bulletinvelopments and uses. Regular features will include also gives prices models and attachments

"The Plastic Designer's Corner" and "Shop Talk may be ordered separately. G. D. pH Automat,sections which will be devoted to discussions of Cyan- SC-l1. The Gamma Instrument Company, Inc., 95amid Plastics as applied to various Industries. Copies Madison Avenue, York 16, New York.

of the magazine may be obtained by addressing The

Editor, Plastics NewsfrontSC-11. American Cyanamid

Company, 30 Rockefeller Plaza, New York 20, New Raw Optical Glass,Lenses, and Objectives. A com-York.' bined catalog, price list, and list of suggested uses ofYork. various types of optical goods are shown

catalog of the Edmund Salvage Company. Among theRecent Information About Pharmacy and Medicine. items listed prisms many varieties, filters,Merck and Company, Rahway, N. J., publish a quart- matic lenses, enlarging lenses, magnifiers,

erly titled, The Merck Report. In it appear articles glass, and telescope sets. Catalog SC-li.about new drugs and their applications as verified by mund Salvage Company, 0. Box 100, Audubon,

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notes about the company's products. The October 1945

issue has articles on Streptomycin, pH and bufferedsolutions, medical problems of menstruation and tropi- Vacuum Difusion Equipment. An illustrated

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copies should be sent to Douglas W. Coutlee, Editor detailed Information, together with schematic

Merck SC-i. Merck Inc. ings of equipment vacuum diffusion

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terials Itemsdrugs, biologicals, chemicals, solid or liquid

Solvents and Chemicals. A four-page leaflet Is Issued food products, may residual moistures

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givesinformation about recentindustrial applications to the damaging high temperatures

of the company's products. U.S. I. Chemical News tion. The equipment Illustrated has aSC-1i. Industrial Chemicals, of 10 pounds vapor per hourStreet,New York 17,N. Y. of 100 microns of mercury. A complete table of speci-Street, New York 17*N. Y. ficationsis included. V-10-D Unit, Vacuum DiffusionProcess, SC-1l. Vacuum Engineering Division, Na-tional Research Corporation, 100 Brookline Avenue,Boston 15, Mass.

GOVERNMENT REPORTSFlow-Type Conductivity Cell. A new positive-flowtype cell Is reported in a release by Industrial Instru-ments, Inc., for use with electrolytic conductivity con-

Information on German Scientific Activities. The De- trollers and recorders.

partment of Commerce has published recently the first a tubular glass

index on industrial and scientific technical reports lindrical platinum

released by the Army and Navy to the Office of the stainless steel centrifugal

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18

I N T E M A R K E T P L A C ERATES to be paid in advance. Regular setting 10¢ a word, minimum charge $2.00 each; count 8 words if a box address is used.Display, 3 inches maximum, $8.80 per column inch. No discounts or commissions.SEND advertisements with remittance to the ADVERTISING DEPARTMENT, American Association for the Advancement of Science,AMERICAN UNIVERSITY, MASSACHUSETTS AND NEBRASKA AVENUES, WASHINGTON 16, D. C. Correct remittancemust accompany instructions and copy and advertisements will be published in sequence of completed orders.

PERIODICALS

Wanted to purchase Scientific Periodicals, Foreign-Do-mestic. WALTER J. JOHNSON, 125 East 23rd Street, NewYork 10, New York.

POSITIONS OPEN

Opportunities Available-(a) Biochemist to head department,university school of medicine; South. (b) Instructor, de-partment of biochemistry, university school of medicine.(c) Young man with reasonable knowledge of bacteriology,physiology, anatomy, to join research organization; workdeals with Investigation of. toxicity of drugs for laboratoryanimals under supervision of pathologist; Middle West. (d)Chemist to direct laboratories of maternity health depart-ment; duties include working with departments of obstetricsand pediatrics, university medical school; Middle West. (e)Bacteriologist, preferably with doctorate degree; researchappointment with laboratories of state department of health;$3,600; Middle West. (f) Parasitologist for teaching ap-pointment; middle western university; rank depends uponqualifications. (g) Instructor in physiology; universitymedical school; Middle West. (h) Bacteriologist; biologicallaboratories, municipal department of health; duties admin-istrative, including some research; $3,800. S11-3. MedicalBureau (BURNEIcE LARSON, Director), Palmolive Building,Chicago 11.

Medical Copywriter. Pharmaceutical manufacturer in North-ern New Jersey wants physician as medical advertising ex-ecutive for copywriting, preparation of clinical articles, andpromotional activities. Previous pharmaceutical training ormanufacturing experience desirable but not necessary. Rec-ord of medical practice desirable. Salary open. Reply,giving personal data. Box 298, "SCIENCE," Advertising,Smithsonian Institution Building, Washington 25, D. C.

New England College has vacancy for Instructor or Assis-tant Professor in Psychology. Ph.D. available in Februarypreferred. Box 307, "SCIENcE," Advertising, A.A.A.S., Mas-sachusetts and Nebraska Avenues, Washington 16, D. C.

Wanted: Bacteriologist, male, B.S. or M.S., preferably withexperience in field of chemotherapy. Research laboratoriesof prominent Indiana Pharmaceutical manufacturer. Salaryrange $2,000 to $3,000. Submit full details of education andexperience; include photo. Box 305, "SCIENcE," Advertising,A.A.A.S., Massachusetts and Nebraska Avenues, N.W., Wash-ington 16, D. C.

Drug Products Development. Pharmaceutical manufacturerin Northern New Jersey wants a pharmacist, pharmaceuticalchemist, or physician with previous pharmaceutical trainingto develop new drug products, improve existing preparations,practical formulation and develop new uses. Salary open.Reply, enclosing photograph and personal data. Box 297,"SCIENCE," Advertising, Smithsonian Institution Building,Washington 25, D. C.

POSITIONS WANTED

Administrative-Man, Ph.D., 34, married, two children. Suc-cessful college professor of biological sciences. Desireschange to administrative post. Either in college, university,hospital, or business side of company dealing In fields relatedto Biology Box 296, "SCIENCE," Advertising, SmithsonianInstitution Building, Washington 25, D. C.

Parasitologist, (doctorate); three years experience malariaresearch; two years field experience in charge malaria andepidemic disease control; three years varied experience inmedical research. Interested in continuing research onmalaria; development of parasiticidal and insecticidal agents.Box 306, "SCIENcE," Advertising, A.A.A.S., Massachusetts andNebraska Avenues, N.W., Washington 16, D. C.

POSITIONS WANTED

The California Medical Bureau, Agency, for scientific and laypersonnel In medicine, biology, chemistry, physics, and alliedsciences, supplies teachers, research workers, laboratorydieners, skilled office help. Prompt service. Registrationfree. Your patronage respectfully solicited. THi CALI-FORNIA MEDICAL BUREAU, Agency, 595 East Colorado Boule-vard, Pasadena 1, California.

BacterlologIsts, Biologists, Physiologists, Chemists, Pharma-cologists, Physiotheraplits, Laboratory Technicians, let ushelp you secure a position. Our service, established 1806,Is nationwide. Write us today. 411 information confidentiaLAzwOZ's-WOODWAaD BURzAU, 30 North Michigan, Chicago 2.

Opportunities Wanted-Physiologist Is available for appoint-ment; B.A. (zoology and physiology), M.A. (physiology),Ph.D. (physiology); several years' successful teaching ex-perience; desires opportunity for teaching and research; willgo anywhere; for further information, please write BuRNEIcELARSON, Director, Medical Bureau, Palmolive Building,Chicago 11.

SUPPLIES AND EQUIPMENT

Wanted to Purchase: Polarimeter. Submit make, details,price, etc. INTERCHEMICAL CORPORATION, Biochemical Divi-sion, Union, N. J. Unionville 2-5200.

%" Discs for the Assay of Penicillnand other Antibacterial Substances

No. 740.E.

Schleicher & Schuell Co.Plant and Lab: Soh Lee Mas.

Read Office: 116-118 West 14th St.New York 11, W. Y.

BALANCES REPAIREDB y~ci>~. All work guaranteed; parts available;

t balances insured while mn our factory.\~~~~~Send for price-list Free use of speciaI iinzI shipping crates with complete packingI \II I1 \materials, etc.I IX11 II I Laboratory EquipmentiI \III\\Al Repared & RGeanisheed

BECKER BALANCES, INC.Hi ~~~~481 Main Bt. New lBochelle, M. Y."Ith Generation of Service

and Integrity"

IMPORTANTPlease note that the Advertising Department of theAssociation has moved to a new location. All inser-tions and replies should be sent to the following ad-dress effective November 19, 1945 rather than theSmithsonian Institution Building:

Advertising DepartmentAmerican Association for the

Advancement of ScienceAmerican University

Massachusetts and Nebraska Aves., NWWashington 16, D. C.

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20 SCIENCE-ADVERTISEMENTS VOL. 102, No. 2656

POLARIZINGMICROSCOPES

PROFITS from PURITY ICOLONY COUNTE

To meet high government specifications and bring top priceson the market, a product must be free from impurities.Many adulterants and all kinds of extraneous matter can be

detected with the Spencer Stereoscopic Microscope. This instru-ment provides a vivid three dimensional image and wide angle ofview which simplify identification and counting. Nearly everytype of industry has adopted it as a standard inspection in-strument.Some of the many other Spencer instruments valuable in in- COLORIMETER

dustry are described at the right.

American w OpticalCO M PA NY A

Scientific Instrument DivisionBuffalo 11, NewYork

mob~ c/ SPENCER c te /,PE'NCeEwR

20 SCIENCE-ADVERTISEMENTS VOL. 102y No. 2656