18 February 1972Vol. 175, No. 4023

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LETTERS The Question of South Africa: D. S. Evans; E. M. van Zindren Bakker, Sr.; L. Greenwald;National Security and the Environment: L. M. Svart; Test Bias Bibliography:R. 0. Fortna; Antilead Regulations: W. B. Hoyt; Kansas State University:R. Higham; Energy Conservation: A. E. Larimore, P. S. Hoover, R. L. Olson ........

EDITORIAL Old Cities, New Cities, No Cities ..................................................

ARTICLES Ecolibrium: A. Spilhaus.Peace through Change: The Risk and Promise for Man's Future: H. H. Humphrey ........The Fluid Mosaic Model of the Structure of Cell Membranes: S. J. Singer

and G. L. Nicolson ..........................................................

NEWS AND COMMENT

RESEARCH NEWS

BOOK REVIEWS

The Soviet Space Program: Effort Said to Surpass Peak U.S. Level ......................

HEW Study on Financial Distress in Medical Schools Focuses on Shortcomings inData Showing Cost Allocation .................................................

Human Environment Conference: Search for a Modus Vivendi .........................

Physics with Lasers: High Resolution Coming of Age .................................

Explorations in Mathematical Anthropology, reviewed by H. Selby; Systems Analysisand Stimulation in Ecology, M. Cody; Rapid Population Growth, B. Duncan; WhiteAttitudes toward Black People, T. F. Pettigrew; Theoretical Aspects ofPopulation Genetics, B. R. Levin; Microbial Control of Insects and Mites,D. E. Pinnock; From Watt to Clausius and Bicentenary of the James Watt Patentfor a Separate Condenser for the Steam Engine, E. S. Ferguson; RelativisticAstrophysics, D. W. Sciama; Synthetic Polymeric Membranes, C. P. Bean;Books Received .............................................................

REPORTS Venus Clouds: A Dirty Hydrochloric Acid Model: B. Hapke ...........................

Photolysis of Formaldehyde as a Hydrogen Atom Source in the Lower Atmosphere:J. G. Calvert et al............................................................

Ultrathin Amorphous Coatings on Lunar Dust Grains: J. P. Bibring et al................Size Frequency Distribution of Martian Craters and Relative Age of Light and

Dark Terrains: A. Woronow and E. A. King, Jr..................................Cyclic Nucleotide Phosphodiesterase: High Activity in a Mammalian Photoreceptor:

R. G. Pannbacker, D. E. Fleischman, D. W. Reed ................................

Air Containing Nitrogen-15 Ammonia: Foliar Absorption by Corn Seedlings:L. K. Porter, F. G. Viets, Jr., G. L. Hutchinson .................................

Dihydroxyphenylalanine in Rat Food Containing Wheat and Oats: R. Hoeldtke et al.......

AR;DyOFjDIRECTOR MNA REES GLENN TRetiring President, Chairman President

V-ilCE PRIESIDENTS AND MATHEMAICS PHYSICSE>-j0CTION SCRE TARIE 0tJohn W. jiTukey Herbert

F. :A. Ficken Rolf M.

:PSYCH I)SOCI

Dale Ja

William D. Garvey Harvey

PHARMACEUTICAL SCIENCES (NO)F. Tice,

John Autian

L receAIwing irm ca

,~~~~~~~~~~~~~~~~~ in . 0 i .;EPresident Executive Secretary

SI'EN ,is publiahed t the week In Deem but

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t. SEABORG LEONARD M. RIESER DAVID BLACKWELL LEWIS M. BRANSCOME:: President-Elect RICHARD H. BOLT BARRY COMMONER

CS (B) CHEMISTRY (C) ASTRONOMY (D)t Fridman Martin Paul George B. Field1. Sinclair Leo Schubert Arlo U. Landolt

kLAND ECONOMIC SCIENCES (K) HISTORY AND PHILOSOPHY OF SCIENCE (L)tColeman Everett Mendelsohn

Sa:polsky Raymond J. Seeger

AGRIC ULTURE (0) INDUSTRIAL SCIENCE (P) EDUCATION (Q)Roy L. Loworn Jacob E. Goldman Lloyd K. JohnsonMichael A. Farrell Jordan D. Lewis Phillip R. Fordyce

PACIFIC DIVISION SOUTHWESTERN AND ROCKY MOUNTAIN DIVISION'Roy A. Young Robert C. Miller John R. Lacher Marlowe G. AndersonPresident Secretary President Executive Secretary

issue on0 the third Tuesday in November, by the American Association for the Advancement tofThe SientIfiC Monthly:. Second-class postage paid at Washington, D.C. Copyright 0 1972 by

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Presence of Lateral Eye Lens Crystallins in the Median Eye of the American Chameleon:D. S. McDevitt ..............................................................

Triiodothyronine: The 3'-Iodine Is Proximal to the a-Ring in Crystal StructureConformation: N. Camerman and A. Camerman .................................

Tissue Factor (Thromboplastin): Localization to Plasma Membranes by Peroxidase-Conjugated Antibodies: S. M. Zeldis et al. .......................................

1,25-Dihydroxycholecalciferol: A Potent Stimulator of Bone Resorption in TissueCulture: L. G. Raisz et al......................................................

Spermatogenesis in Cultured Testes of the Cynthia Silkworm: Effects of Ecdysoneand of Prothoracic Glands: M. P. Kambysellis and C. M. Williams .................

Atmospheric Ammonia: Absorption by Plant Leaves: G. L. Hutchinson, R. J. Millington,D. B. Peters ................................................................

Evidence of Pollen Tubes in Paleozoic Pteridosperms: G. W. Rothwell .................Cytochalasin B: Does It Affect Actin-Like Filaments?: A. Forer, J. Emmersen,

0. Behnke ..................................................................Wound-Induced Proteinase Inhibitor in Plant Leaves: A Possible Defense Mechanism

against Insects: T. R. Green and C. A. Ryan ...................................Cannabinoids with a Propyl Side Chain in Cannabis: Occurrence and

Chromatographic Behavior: R. A. de Zeeuw et al.................................Ultrastructural Evidence for Nephropathy Induced by Long-Term Exposure

to Small Amounts of Methyl Mercury: B. A. Fowler ..............................Improved Flow Rates with Porous Sephadex Gels: D. H. Sachs and E. Painter ............Scanning Electron Microscopy of the Human Fallopian Tube: A. Ferenczy et al..........Inhibition of Antibodies to Nuclear Antigen and to DNA in New Zealand Mice

Infected with Lactate Dehydrogenase Virus: M. B. A. Oldstone and F. J. Dixon .......Photosynthetic Adaptation to High Temperatures: A Field Study in Death

Valley, California: 0. Bjorkman et al...........................................Rapid Increase of Phenylethanolamine N-Methyltransferase by Environmental Stress in an

Inbred Mouse Strain: R. D. Ciaranello, J. N. Dornbusch, J. D. Barchas ..............Auditory Evoked Response: Meaningfulness of Stimuli and Interhenmispheric

Asymmetry: Y. Matsumiya et al................................................Hippocampal Unit Activity during Classical Aversive and Appetitive Conditioning:

M. Segal, J. F. Disterhoft, J. Olds ..............................................Technical Comments: Nuclear Magnetic Relaxation Time of Blood and Blood Velocity:

J. Kumar and V. Kumar; J. R. Singer; Absolute Dating Techniques: G. J. Wasserburg,J. C. Huneke, F. A. Podosek; L. Husain, 0. A. SchaeJffer, J. F. Sutter ...............

Leonard M. Rieser, President-Elect, 1972: G. Holton .................................AAAS Council Meeting, 1971: W. Bevan ............................................Report to the Association-1971: A. Spilhaus and W. Bevan ...........................AAAS Officers, Committees, and Representatives for 1972 .............................

fWARD3 GQD ENOH DANIEL P.MOYNIHAN WILLIAM T. GOLDEN WILLIAM

PARKiNS;S- Tre Executive Officer

GLOLOGY AND GEOGRAPHY (E) BIOLOGICAL SCIENCES (FG) ANTHROPOLOGY (H)Fraink C. Whitmore Ian Sussex Richard N. Adams'William E. Be$nson Richard J. Gaas Anthony Leeds

NG INEERING (l.) MEDICA SCIENCES (N) DENTISTRYNe wman A. H1all0E:44 s -Robet :W. Berl-iner ::X ph IL. Henry::: ::

AR DunD F. Douglas Lert -Sh Pearlm:

INFORMATONff AND STATISTICS' (U) ATMOSPHERIC AND HYDROSPHERICCOM ()W. D)uane Evans SCIENCES (W)

Andrew A. AAies Ezra Gasr John .KKn-uss:-tScott y- :ouis I Battn

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