7 April 1972 3Vol. 176, No. 4030

LETTERS Anecdotal Evidence: J. Vaage; Argonne's Role: S. D. Freeman; B.I. Spinrad;Funding Basic Research: C. S. Russell; D. Stetten, Jr.; Marihuana andMotivation: G. Marx; E. L. Abel; Freedom of Information:W. A. Shurlifj ......................................................

EDITORIAL A Bubble in the Educational Pipeline: B. Vetter .............................

ARTICLES The Crisis about the Origin of Irreversibility and Time Anisotrophy: B. Gal-Or ....

Strategies of Mutual Deterrence: R. H. Kupperman and H. A. Smith ............

Population Density and Pathology: What Are the Relations for Man?:0. R. Galle, W. R. Gove, J. M. McPherson .............................

NEWS AND COMMENT

BOOK REVIEWS

National Environmental Policy Act: Signs of Backlash Are Evident ................

Sperm Banks Multiply as Vasectomies Gain Popularity ........................

BBS: Agency Controvenes its Own Regulations ................................

Navy F- 14: New Fighter s Cost, Sophistication, Stir Controversy ................

Man's Impact on the Climate anod Inadvertent Climate Modification, reviewedby A. L. Ha7mnond; Impingement of Man on the Oceans, W. S. Wooster;Developmental Genetics, F. H. Wilt; Principles of MammalianAging, R. J. Hay; Essentials of Molecular Pharmacology, A. Trevor .......

REPORTS Magnetite: Behavior near the Single-Domain Threshold: D. J. Dunlop ...........

Ratite Eggshells from Lanzarote, Canary Islands: E. G. F. Sauer andP. Rothe ...........................................................

Production of Specific Antibody by Lymphocytes of the Bursa of Fabricius:P. J. Van Alten and H. J. Meuwissen ...................................

BOARD OF DIRECTORS'

VICE PRESIDENTS AND:SECTION SECRETARIES

DIVISIONS

MINA 'REES GLENN T. SEABORG LEONARD M. 'RIESER DAVID, 131 KWEL LEWIS, NA. BASRetiring President, Chairmani President Pridet6EltRICHARD HA BOLT BARRY CMOE

MATHEMATICS (A) PHYSICS (B) CHEMISTRY (C) ASTRONOMY(D)John W. Tukey Herbert Friedman Martin Paul George B. FieldF. A. Ficken Rolf M. Sinclair -teoSchube: ArloWU. LndoltPSYCHOLOGY (1) SOCIAL AhCD ECONOMIC SCIENPCES (K) HISTOY AND PHILOSOPHY OF SCIENCE:aisB. Harris James S. Coleman Everettt MendalsohnDale Ram n J. arSeeger -wlwwt ;;;Ei0 t0 ;,&;| j o ; 0;0

-William D. Garvey Harvey Sapolsky Ray**1.PHARMACEUTICAL SCIENCES (Np) AGRICULTURE (0) INDUSTRIAL SCIENCE (P) EDIJCATION (Q)Linwood F. Tice Roy L. Lovvorn Jacob E. Goldman Lloy K. Johnsonjohn Autian MichaelA.Farrell 'Jordan 0. Lws PlziIIlp R. od

ALASKA DIVISION PACIFIC DIVISION SOUTHWESTENAND ROCKY MOUNTAN DSI(Gordon Harrison Irma Duncan Roy A. Young: obrit C. Miller John R. Lh aro . Anderso'President Executive Secreta-ry President ~ Secretary President Executive~Secretary

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Epoxides of Carcinogenic Polycyclic Hydrocarbons Are Frameshift Mutagens:B. N. Ames, P. Sims, P. L. Grover ....................................... 47

Radula Tooth Structure of the Gastropod Conus imperialis Elucidated byScanning Electron Microscopy: A. J. Kohn, J. W. Nybakken, J.-J. Van Mol ... 49

Biosynthesis of a- and 83-Ecdysones from Cholesterol outside the ProthoracicGland in Bombyx mori: K. Nakanishi et al............................... 51

Length-Force Relation of Calcium Activated Muscle Fibers: M. Schoenberg andR. J. Podolsky ......................................................... 52

Immunoglobulin M: Fixation of Human Complement by the Fc Fragment:A. G. Plaut, S. Cohen, T. B. Tomasi, Jr................................... 55

Shared Antigens between Mycobacterium bovis (BCG) and Other Bacterial Species:P. Minden et al...................................................... 57

Inversion Polymorphism and Adult Emergence in Anopheles stephensi:M. Coluzzi ............................................................. 59

Restoration of Antibody-Forming Capacity in Cultures of Nonadherent SpleenCells by Mercaptoethanol: C. Chen and J. G. Hirsch ......................... 60

Magnetic Compass of European Robins: W. Wiltschko and R. Wiltschko .............. 62Angiotensin I: Metabolism by Plasma Membrane of Lung: J. W. Ryan, U. Smith,

R. S. Niemeyer ......................................................... 64

Cochlear Microphonic Audiograms in the "Pure Tone" Bat Chilonycterisparnellii parnellii: G. Pollak, 0. W. Henson, Jr., A. Novick ................... 66

Nutritional and Environmental Interactions in the Behavioral Development ofthe Rat: Long-Term Effects: D. A. Levitsky and R. H. Barnes ................. 68

The Chimpanzee as an Animal Model for Investigating Alcoholism:W. A. Pieper et al....................................................71

Mating Behavior and Life Habits of the Sweet-Bay Silk Moth (Callosamiacarolina): L. N. Brown ................................................. 73

Complex Components of Habitat Suitability within a Butterfly Colony:M. C. Singer .......................................................... 75

Motion Perception: A Color-Contingent Aftereffect: 0. E. Favreau, V. F. Emerson,M. C. Corballis ........................................................ 78

WARD H. GOODENOIUGH DANIEL P. MOYNIHAN WILLIAM T. GOLDEN WILLIAM BEVANCARYL P. HASKINSl PHYLLIS V. PARKINS Treasurer Executive OfficerGEOLOGY AND GEOGRAPHY (E) BIOLOGICAL SCIENCES (FG) ANTHROPOLOGY (H) COVERFrank C. Whitmore Ian Sussex Richard N. AdamsWilliam E. Bensont Richard J.~Goss Anthony LeedsENGINEERING!M(M) MEDICAL SCIENCES (N) DENTISTRY (fId) "Pure tone" bat (Chilonycteris par-Newnan A. Hall Robert W. Berliner Joseph L. Henry nellii) emitting orientation cries. TheRanrL. Dunicombe F. Douglas Lawrason Sholom Pearimannei)emtngoetaoncesThINFORMATION AD Fmegaphone-shaped mouth aids in theINFORMATION AND STATISTICS (U) ATMOSPHERIC AND HYDROSPHERICCO:0;S0:MMUNICAION:0 W.Da=e7n SIN)E W forward beaming of echolocationCMNIAIN()W. Duane Evans SCIENCES (W)AndreW,A. ALnes. Ezra Glaser John A. Knauss pulses while the funnel-shaped earsScotAamsLOUIS ~J. ~Battani

are advantageous for the reception ofechoes. See page 66. [William SaccoBiology Dept., Yale University]