September 23, 1949, Vol. 110 13

BORON TRIFLUORIDE and ITS DERIVATIVESBy Harold S. Booth and Donald R. Martin. This new book facilitates investigations made withboron trifluoride by providing a complete and organized presentation of the subject, its many ap-plications, complexes, reactions, properties, and coordination compounds. Illustrations deal withthe commercial handling of boron trifluoride, types of research apparatus used in studying co-ordination compounds, and other important aspects. An extensive bibliography includes refer-ences to many articles on boron trifluoride when used as a catalyst.October 1949 Approx. 296 pages Illus. Prob. price $5.00

APPLIED EXPERIMENTAL PSYCHOLOGYThe Psychology of Engineering DesignBy Alphonse Chapanis. Wendell R. Garner, and Clifford T. Morgan. A new WILEY PUB-LICATION IN PSYCHOLOGY (Herbert S. Langfeld, Advisory Editor) showing how themethods and discoveries of experimental psychology can be applied to engineering design prob-lems. The authors summarize basic information about man's capacities to see, hear, and makemovements. They then apply this information to practical design problems. Two chapters aredevoted to the theory and use of statistics.Ready in October 434 pages 196 illus. Prob. price $4.50

INTRODUCTION to PARASITOLOGYWith Special References to the Parasites of ManBy Asa C. Chandler. A new and completely revised edition which introduces the reader to theincreasingly important subject of parasitology. References to parasites other than those of manhave been greatly increased in this edition, and 50% of the illustrations are new. Included arekeys to such groups as the trichostrongylids and the biting and sucking lice of domestic animals,plus a separate chapter on the discussion of Acanthocephala.8th Ed. September 1949 766 pages 282 illus. $6.00

ACOUSTIC MEASUREMENTSBy Leo L. Beranek. This new book provides a concise treatment of the entire field of acousticmeasurement. It considers the basic facts underlying practically all types of acoustic measure-ments techniques; discusses the details of the fundamental types of acoustic measuring ap-paratus; treats the relative advantages and disadvantages of alternate methods for accomplish-ing electro-acoustic phenomena; and presents the theory of many electro-acoustic phenomena.September 1949 914 pages Illus. $7.00

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PLANT AND SOIL WATER RELATIONSHIPSBy PAUL J. KRAMER, Duke University. McGraw-Hill Publications in the Botanical Sciences.340 pages, $4.50

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SCIENCE WRITING AWARDS

Bringing with it profound mysteries, as well as nearmiracles, the atomic age has made a knowledge of sci-entific progress as essential to world understanding asa comprehension of politics or economics. Believingthat special recognition and encouragement should begiven to those writers who have the grave responsi-bility of making science something near and real tothe common man, the Westinghouse EducationalFoundation and the American Association for theAdvancement of Science have jointly sponsored theScience Writing Awards since 1946 for newspapers,and since 1947 for magazines. The task of makingour citizens acquainted not only with the triumphsof science, but also with the orderly paths by whichthey are attained, makes the Awards of more thancasual interest.

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* HYPOPHYSECTOMIZED RATSShipped to all points via Air Express

For further information write808 E. 58th St.

HORMONE ASSAY LABORATORIES, Inc. * Chicago 37, Ill.

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ANIMAL CAGES AND ACCESSORYEQUIPMENT

ORDERS NOW ACCEPTED FOR EARLY DELIVERY

HOELTGE BROS., Inc.1919 Gest St. Cincinnati 4, Ohio

Write for Illustrated brochure

GLYCOCYAMINE-Hydroxyproline, L-Methionine* AMINO ACIDS * BIOCHEMICALS* PRE-MIXED MICROBIOLOGICAL ASSAY MEDIA

H. M. CHEMICAL COMPANY, LTD.144 North Hayworth Avenue Los Angeles 36, California

FOR SALE: Two multispeed attachments for International size 2Centrifuge, up to 18,000 RPM, brand new, less than i2 price,$60.00 each. SYN-ZYME LABORATORIES, 78 West 12Street, New York 11, N. Y. X

AN I MALS for RESEARCH .Rabbits, Mice, W. Rats, Guinea Pigs,Hamsters, Chickens, Ducks, Pigeons.

Send for Price List ... J. STOCKER * Ramsey, N. J.

All Am in o Ac i d s (natural, synthetic, unnatural),Rare Sugars, Biochemical Products, Reagents, New Pharma-ceuticals in stock. Write or phone PLaza 7-8171 for completeprice list.BIOS LABORATORIES, INC. 17 West60th Street,Ne ork 23. N. Y.

DON'T MISS...The October 7th EQUIPMENT ISSUEBoth the editorial and advertising pages of this special issue willfeature an unusually interesting and comprehensive review of thelatest developments in scientific instruments and equipment, and willbe of direct interest to the more than 33,000 readers of SCIENCE.Because of this high reader-interest, this issue will be an all-importastmedium for Advertisers who wish to reach the persons responsible forpurchases for the country's leading educational institutions, industriallaboratories and research foundations.Copy must be sent immediately-regular rates will apply (seeCharges and Requlrements at top of this page). DON'T DELAY-SEND YOUR AD COPY NOW I

SCIENCE 23

SUPPLIES AND EQUIPMENT

I QUARTZWAREfor laboratory and industry

-_ A complete line of standard laboratory ware.Also custom fabricating to meet your requirements.

Write for particulars.THE PANRAY CORP.

398 Broadway New York 13, N. Y.

TRANSPARENT BOXESfor every laboratory, every col-

lector of small objects, every homeworkshop.

Five sizes.Write for leaflet TR-S.

R. P. CARCILLE118 Liberty St., New York 6, N. Y.

* SPECIAL GLASS APPARATUSOur glass blowing department is available for specialscientific and technical glass apparatus made tospecifications and drawings. Inquiries invited.Estimates furnished.

E. M A C H L E T T & S O N218 East 23rd St. New York 10, N. Y.

WANTED... New Ethical Productsfor Manufacturing and DistributionOld established firm would consider equitable arrangementfor the manufacture and distribution of new ethical products.Must have sound clinical background. Write fully. Box321, SCIENCE.

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SCIENCE

HOTEL RESERVATIONS116th AAAS MEETING

New York City, December 26-31, 1949The list of hotels and the reservation coupon below are for your convenience in

making your hotel room reservation in New York City. Please send your application,not to any hotel directly, but to the Housing Bureau of the New York Convention andVistors Bureau to avoid delay and confusion. The experienced Housing Bureau willmake assignments promptly and the hotel will send a confirination directly to you intwo weeks or less. Mail your application now) to secure your first choice of desiredaceominodations.

HOTELS AND RATES: PER DAYWVITIIOIJT BATHSingle Double

WITH BATHSingle Double

$4.00-$7.50

NEW YORKER

$6.50-$10.50

$4.50 $7.00-$10.00 $13.50

TwinBeds

$8.00-$14.00

3Beds

4Beds

$11.00 $13.00

$8.00 $9.50 $12.00-$13.50 -$10.50 -$14.00

3McA l PIN $3.(00 $5.00-$3.30 -$5.50

GOVERNOR CLINTON

MARTINI QIJE $2.5()-$3.00

$5.75

$4.00-$7.00

$4.00-$6.0()

$3.75-$5.00

$6.50-$10.00

$6.50-$8.00

$6.00-$8.00

$7.50-$11.00

$7.50-$9.50

$6.00-$8.00

$9.50 $14.00-$12.00 -$17.50

$10.50 $12.00

$9.00 $11.00

Suites range from $10.00 to $26.00; $10.00 to $18.00 at M21artinique, $12.00 to $22.00 atNew Yorker, $12.50 to $26.)0 at Governor Clintoni, $13.00 to $16.00 at MIcAIl)il, andel$15.00 to $17.00 it Statler.The New Yorlker charges $2.50 for an additional eirsoii per room; the other hotels $2.00.

* New York City Hotel-room Tax of 5% is riot included In this schedule of rates.** A list of the headquarters of each society appeared in THE SCIENTIFIC MONTH1LY for August,

pages iv and v, and in Associationl Affairs, SCIENCE, August 26, page 220.

THIS YOUR HOTEL RESERVATION COUPON.

Miss Sylvia T. Peltonen, ManagerHousing BureauNew York Convention and Visitors Bureau Date of application ..........

500 Park AvenueNew York 22, N. Y.

Please reserve the following accommodations for the 116th Annual Meeting of the AAAS:TYPE OF' ACCOMMO1)ATION DESIRED

Single Room Rate

1)oubleRoom...............Rate Number in Party

Other .................. Rate S haringthis room will be:

.......................................................................

(Enumerate and ttleah list giving nineR anad addresses of catch person, includlinig yourself)CHOICE OF HOTEL

First chloice.DATE OF ARRIVAL

SIGNED

ADDR ESS

Second choice .. Third choiceDEPARTURE DATE

(These ntust be indicated)

....(Street ) (City aind Zone) (State)

Mail this now to the Housing Bureau.Rooms will be assigned and confirmed in order of receipt of reservation.

Hotel will confirm directly inl two weels or less.

HOTEL* *

STATLER

September 23, 1949, Vol. 11024

Modern, All-Metal, Fully Enclosed, More Convenient

This streamlined manometric apparatuscontains new features for more accurateanalysis and is equipped with Van Slyke-Folch extraction chamber for use in carbondeterminations as well as gas analysis.

The entire shaking mechanism is enclosedin an all-metal, seamless housing. Motor,wiring, and driving gears are protectedagainst spillage and fumes. The perfectlybalanced housing and weighted base insurequiet operation. Crevices are minimized toprevent trapping of mercury.

Speed of ball-bearing motor, controlled byan improved rheostat, permits exact adjust-

ment at any desired point. Additional re-finements for the operator's convenienceinclude a trough for recovering mercury ...

individual fluorescent lights for readingmanometer and extraction chamber ... arack-type slide holder for raising and lower-ing leveling tube . . . clearly etched gradua-tions . . . gas tight stopcocks, selected fortaper and bore, which reduce wear . .. en-tire apparatus can be carried by one man.

JL13590 Improved Van Slyke Manometric Appara-tus, as described with manometer tube, extractionchamber, leveling bulb, aspirator bottle, thermo-meter, cord and plug but without mercury. Foroperation on 1 1 5 volts, A. C. each ...... $285.00

An dccurate `MICRO-DEPTH GAUGE"L built into your NEW AO SPENCER MICROSCOPE

WHEN focusing a new AO Spencer Microscope you'll notice increased sensi-tivity and smoothness of action. Le.s.r apparent but no less important is thegreater accuracy made possible by an exclusive new Constant Ratio Lever.Now you can compute specimen thickness accurately for the fine adjustmentscale tells exactly the distance that the microscope body moves up or downthroughout its entire range of travel. Ballbearing ways, combined with rollers,reduce friction and produce a smooth, sensitive, accurate movement. Thedirect drive micrometer screw is precision ground. It eliminates backlashand compensates for wear.Tests, including 3,164,000 complete revolutions, indicate that this new fineadjustment will withstand a lifetime of hard wear.

Ask to see the completely new AO Spencer Micro-scopes-or write for your copy of this catalog de-scribing the entire line of laboratory instruments.Write Dept. W5.

American Optical CompanyScientific Instrument Division

Buffalo 15, New York

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SPENCER