DECEMBER 2, 1949

PRODUCTION OF MESONS BY X-RAYSEDWIN M. McMILLAN, JACK M. IPETERSON,

AND R. STEPHEN WHITE

EXPERIMENTAL CONTROL INHYPNOTIC AGE REGRESSION STATES

ROBERT M. TRUE

TECHNICAL PAPERS

COMMENTS AND COMMUNICATIONS

NE'WS AND NOTES

COMPLETE TABLE OF CONTENTS ON PAGE 3VOLUME 110, NUMBER 2866

ADVANCEMENT OF SCIENCE

me

IIIIIIIIIIIIIIIII

Un

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1December....2. 1949; WL. A10 SCIENCE

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2 SCIENCE December 2, 1949, Vol. 110

AAAS EDITORIAL BOARDSCIEN CE _ (Terms Ezpire June

30, 1950)George A. Baitsell H. Bentley Glass

Karl Lark-HorovitzVol. 110 No. 2866 Friday, December 2, 1949 Lorin J. Mullins Malcolm H. Soule

Howard A. MeyerhoffChairman

Beth WilsonExecutive Editor of Science

F. A. Moulton, Advertising Representative

CONTENTS

Production of Mesons by X-Rays:Edwin M. McMillan, Jack M.Peterson, and R. AStephen White. 579

Experimental Control in hypnoticAge Regression States:Robert M. Irte .. ... 583

Technical PapersA Preliminary Report on the Study of the

Relationship of Psychosomatics to OralConditions-Relationship of Personalityto Dental Caries: John H. Manhold and

VivianW.Manhold ..................... ................... 585A Preliminary Report on Histochemography:

George A. Boyd and Francis A. Board ............ 586Some Observations on the Role of Folic Acid

in Utilization of Homocystine by the Rat:MaryAdelia Bennett ......................... ............... 589

Separation of the Ionic Species of Lysine byMeans of Partition Chromatography:

S. Aronoff ........................................ 590

Demonstration of a Fatty Acid Oxidase inFrozen Poultry Fat: Phyllis Ellman and

Barbara A.McLaren .................. .................... 591

A Simple Jet Type Air Stirrer: G. C. Potterand F. A. Kiimmerow ........ 592

Comments and CommunicationsDo Amino Acids Fluoresce on Papergrams ?;

The Coxsackie Group of Viruses; BasicIssues in the Controversy on Zoological

omtienclature 5................................ ......... 593

News and Notes ...........................

Science, a weekly journal founded in 1880, is publishedeach Friday by the American Association for the Advance-ment of Science at the Business Press, 10 McGovern Ave.,Lancaster, Pa. Editorial and Advertising Offices, 1515 Massa-chusetts Ave., N.W., Washington 5, D. C. Telephone, Execu-tive 6060. Cable address, SCIMAG, Washington, D. C.Entered as second-class matter at the Post Office at Lancaster,Pa., January 13, 1948, under the Act of March 3, 1879.Acceptance for mailing at the special rate postage providedfor in the Act of February 28, 1925, embodied in Paragraph4, Sec. 538, P.L. and R., authorized January 13, 1948.

Manuscripts submitted for publication should be sent to theEditorial Office, with stamped, self-addressed envelope en-closed, for possible return. The AAAS assumes no responsi-bility for 'the safety of the m inus(ripts or for the opinionsexpressed- by contributors.Annual subscription, $7.50; single copies, $.25: foreign

postage, outside the Pan-American Union, $1.00: Canadian

postage, $.50. Remittances and orders for subscriptions andsingle copies should be sent to the Circulation Department,Science, 1515 Mass. chusetts Ave., N.W., Washington 5, D. C.Membership correspondence for the AAAS should be addressedto the Administrative Secretary of the same address.Change of address. Four weeks' notice Is required for

change of address. This should be sent to Science Recorder,1515 Massachusetts Ave., N.W., Washington 5, D. C. Whenordering a change, it is necessary to furnish an address stencillabel from a recent issue. Claims for a missing number willnot be allowed If received more than 60 days from date ofissue. No claims allowed from subscribers due to failure tonotify the Circulation Department of a chanlge of address orbecause an issue is missing from their files,'or for any reasonfrom subscribers in Central Europe, Asia, or the PacificIslands (other than Hawaii).The AAAS also publishes The Scientific Moat llv. Subscrip-

tion rates on request.

..)

SCIENCE

in the NATIONAL NUCLEAR ENERGY SERIES

THE TRANSURANIUM ELEMENTS. Research PapersPlutonium Project Record. Division IV. Volume 14BEdited by GLENN T. SEABORG, University of California. JOSEPH J. KATZ and WINSTON M. MAN-NING, Argonne National Laboratory. 1778 pages, two parts (not sold separately), $15.00

This work consists of more than 150 original papers dealing with the transuranium elements and cog-nate topics. The papers are devoted to the four known transuranium elements: neptunium, pluton-ium, americium, and curium. There are several papers concerning radium, actinium, thorium, pro-tactinium, and uranium, which are included for reference convenience.

THE CHEMISTRY OF URANIUM (Division Vil. Volume 5)CHEMISTRY OF URANIUM-Collected Papers. (Division VilI. Volume 6)

Manhattan Project. Division VIII. Volumes 5 and 6

By JOSEPH J. KATZ, Argonne National Laboratory, and E. I. RABINOWITCH, University of Illinois.In preparation

Scheduled for publication early in 1950, these volumes will comprise one of the most exhaustivecritical treatises ever published on the chemistry of a single element. The work will contain a wealthof material applicable to the entire field of inorganic chemistry.

THE CHARACTERISTICS OF ELECTRICAL DISCHARGESIN MAGNETIC FIELDS

Electromagnetic Separation Project. Division I. Volume 5Edited by A. GUTHRIE and R. K. WAKERLING, Radiation Laboratory, University of California.376 pages, $3.50

This book presents a record of some of the work done at the California Radiation Laboratory innuclear science. The primary emphasis in this work is on the case of discharges in the vapors ofuranium compounds. The volume is in the form of a series of collected papers and does not coverall the investigations carried, although the most significant studies are included.

VACUUM EQUIPMENT AND TECHNIQUESElectromagnetic Separation Project. Division I. Volume 1Edited by A. GUTHRIE and R. K. WAKERLING. In press

This volume is concerned with the development and study of high vacuum equipment made by thepersonnel of the University of California Radiation Laboratory. The volume is intended as a com-pilation of observations made in the course of developing high vacuum equipment for use in elec-tromagnetic separation plants. This equipment was produced on a scale never previously undertakenand a large amount of pioneering work was done both on equipment and testing.

Send for copies on approval

4 December 2, 1949, Vol. 110

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6 SCIENCE December 2, 1949, Vol. 110

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December 2, 1949, Vol. 110 SCIENCE

SIX-PLACE

ELECTRIC STYLUS INPUT CONTROLFOR DRY RECORDING ON ELECTRO-SENSITIVE PAPER

For individual control of multi-ple electric marking devices formaking permanent Kymographrecords without use of smoked

paper or ink.

8075-C.

ELECTRIC STYLUS INPUT CONTROL, Six-Place, for dry recording on electro-sensitive paper,without use of smoked paper or ink; in accordance with circuit design developed at the Merek Institutefor Therapeutic PIesearch. Provides a harmless, precisely controlled power source for producing continu-ous line recordings on Teledeltos paper, and can be used on practically any kymograph with minor modi-fication.

Consisting essentially of an electronic power unit with six separate electric circuits and controls forregulating the electric current of individual styli; six removable stylus circuit leads, 6 ft. long, with con-necting tips and clamps, pilot lamp and on-off switch, mounted in a ventilated metal case with slopingpanel and gray crystal lacquer finish.

Teledeltos paper is a gray-surfaced, electrically conducting, coated sheet developed by WesternUnion but eut to size and re-rolled for laboratory use. Requires no preparation, developing or process-ing in the laboratory, and is permanently blackened where an electric current passes through the coat-ing, the intensity of the black being determined by the current magnitude. Resulting records are sharpand clean and unaffected by light or atmosphere.8075-C. Electric Stylus Input Control, Six-Place. as above described, with 5 ft. connecting cord and plug, but without

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7

SCIENCE December 2, 1949, Vol 110

OreOter

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8 SCIENCE December 2, 1949, Vol. 110