11 Decemiiber 1964Vol. 146, No. 3650

LETTERS Race. Science. atnd Social Policy: J. R. Jaqluitlh, A. Monitaga, J. Rabini,A. S. ELadller, P. Giese, A. R. Beals ... ..................

EDITORIAL The Great Teachers ......................................................

ARTICLES The Electrical Activity of the Nervous Svstenm: M. A. B. Brazier ..............

Electrical signals are the neurophysiologist's clue to coding in thenervoLIs S'VStelll.

Quantized Magnetic Flux in Superconductors: R. D. Par.ksExperiments confirm Fritz London's early concept that superconductivity isa nmacroscopic quantum phenonmenon.

The Outlook for World Population: J. M. Stycos ........Population control has begun to receive serious attention fromgovernmaents and other organizations.

NEWS AND COMMENT

BOOK REVIEWS

Scientists and Engineers in the Presidential Camiipaign ....................

Repor-t from Europe: Britain Confronts Its Technical Options: V. K. McElheny ....

Jolin James A ludulbon and A ldubon's Wildlife, reviewed by W. Coleinan; otherreviews by E. Scharrer, F. L. Campbell, B. S. H. Royce, C. Daniel,G. Al. Kosolapofj, V. Rojansky, E. Heftmiann, R. B. A nlderson,F. G. Evanis, B. J. Pettis, P. F. Davison, A. Szent-Cy5rgyi 1450

REPORTS Radar M/leteor Counts: Anomzalous Increase during 1963: B. A. McIntosh andP. Al. 1i.linion . .. ..... 1457

Meteors: An Unexpected Increase in 1963: C. D. Ellyett and C. S. L. Keay .......

Sonar Probing in Narragansett Bay: H. E. Edlerton et al.

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Acetylene Ester from Aster spinostus.: J. C. Spitzer and C. Steelink ... ............ 1460

Thermodynanic Equilibria in Prebiological Atmospheres: M. 0. Dayhiofj,E. R. Lippincott, R. V. Eck .......... 1461

BOARD OF DIRECTORS ALAN T. WATERMAN. LAURENCE M. GOULD, HENRY EYRING, JOHN W. GARDNER DAVID R. GODDAIRetiring President, Chairman President President Elect H. BENTLEY GLASS DON K. PRICE

VICER PRESIDENTS AND MATHEMATICS (A) PHYSICS (B) CHEMISTRY (C) ASTRONOMY (D)SECTION! SECRETARIES R. W. Hamming Ralph A. Sawyer Roland Rivest Walter Orr Roberts

Wallace Givens Stanley S. Ballard Frant'k

ANTHROPOLOGY (H) PSYCHOLOGY (I) SOCIAL AND ECONOMIC SCIENCES (K) HISTORY AND PHILOSOPHY OF SCIENCEAnthony F. C. Wallace Lorrin A. Riggs Harold D. Lasswell John MurdochEleanor Leacock Frank W. Finger Ithiel de Sola Pool N. Russell Hanson

PHARMACEUTICAL SCIENCES (Np) AGRICULTURE (0) INDUSTRIAL SCIENCE (P) EDUCATION (0)Lee H. MacDonald Edward F. Knipling Herbert S. Conra(Joseph P. Buckley Howard B. Sprague Allen T. Bonnell Frederic B. Dutto

DIVISIONS ALASKA DIVISION PACIFIC DIVISION SOUTHWESTERN AND ROCKY MOUNTAIN DIVISIIIRichard M. Hurd George Dahigren James Bonner Robert C. Miller Aden B. Meinet Marlowe G. AndersonPresident Lxecutive Secretary President Secretary President Executive Secretary

SCIENCE is published weekly on Friday and on the fourth Tuesday in November by the America n Association for the Advancement of Science, 1515 Mass ach;usetts Ave., N

Washington,: D.C.20-005. Now combined with The SCientific Monthly®. Second-class postage paid jat Washington, D.C. Copyrightj 1964bythe American Assoitio fo

Advancementiof Science. Annual subscriptions $8.50; foreign postage, $1.50; Canadian postage,0 75<; single copies, 35e. School year substcriptions:; 9 months, $7; 10 monti$7.:50.Provide 4 weeks' notice for change ot address, giving new and old address and zip numbers. Send a recent address label. SCINCE is indexedn theReaders Gui

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D-Malate: Effects on Activity of L-Malate Dehydrogenase in Developing SeaUrchin Embryos: R. D. Billiar, J. C. Brungard, C. A. Villee ...... .......... 1464

Polyoma Virus Genetic Material in a Virus-Free Polyoma-Induced Tumor:D. Axelrod, K. Habel, E. T. Bolton ..................................... 1466

Endogenous Pyrogen Release from Rabbit Blood Cells Incubated in vitro withParainfluenza Virus: E. Atkins, M. Cronin, P. Isacson ..................... 1469

Muscular Contraction as Regulated by the Action Potential:A. Sandow and H. Preiser ........................................... 1470

Interferon-Like Viral Inhibitor in Rabbits after Intravenous Administration ofEndotoxin: M. Ho ............................................... ..... 1472

Cycloheximide: Aspects of Inhibition of Protein Synthesis in Mammalian Cells:H. L. Ennis and M. Lubin ................... 1474

Bone Cells: Biochemical and Biological Studies after Enzymatic Isolation:W. A. Peck, S. J. Birge, Jr., S. A. Fedak ................. ... ............ 1476

N6-Benzyladenine: Inhibitor of Respiratory Kinases: V. Tuli, D. R. Dilley,S. H. Wittwer .. ................................................ ... 1477

Conjunctiva Contains Factor Inhibiting Growth of Candida albicans:P. J. Kozinn, L. Caroline, C. L. Taschdjian .............................. 1479

Chlorinated Insecticides: Fate in Aqueous Suspensions Containing MosquitoLarvae: M. C. Bowman et al. ............ ... ........................... 1480

Averaged Brain Activity Following Saccadic Eye Movement: K. Gaarder et al. .... .. 1481

Culturally Transmitted Patterns of Vocal Behavior in Sparrows: P. Marler andM. Tamura ......... ................................................. 1483

Mangabey x and b Wave Electroretinogram Components: Their Dark-AdaptedLuminosity Functions: A. E. Jones, M. C. Polson, R. L. DeValois .. .......... 1486

Comments on Reports: Relative Strontium and Calcium Uptake by Green Algae:L. G. Williams and N. R. Kevern ...................................... 1488

MEETINGS Enzyme Regulation in Mammalian Tissues: G. Weber; Diffusion in Oceans andFresh Waters: G. B. Dowling and F. C. W. Olson; Forthcoming Events ........ 1489

COVER

..,. ~~~.. .4~~i~# Hover flies (Syrphus ribesii) may..~~ .....~~~....<. ~ ~ be recognized by a longitudinal, false

vein in the wings between the radius~~ .~~. ~~~~ .~~ and the media. Many are brightlycolored and resemble bees, bumble

...~~~~~~~~.~ bees, and wasps. They feed uponA~~...T272I~~2~ ~ .. ~~. ~ nectar and pollen of flowers and are=t__... ~ of value as pollinators of many plants.

~~~ *1 ~~~~~~~~ ~See review of The A mazing World of~~~~~ ~ ~ ~ .> ~~~~~~Insects, page 1451. [Macmillan Coin-

> ~ pany and A. Oosthoek PublishingCompany]

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