Articles

 Grand Canyon Still Threatened

William C. Bradley
Science 28 April 1967: 451.
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 Selection of NIH Director

DeWitt Stetten, Jr.
Science 28 April 1967: 451.
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 McNamara in Mississippi

Oliver E. Bell, Jr.
Science 28 April 1967: 451.
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 Letter to the Editor

Benjamin B. Graves
Science 28 April 1967: 452.
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 Letter to the Editor

J. Murray Luck
Science 28 April 1967: 452.
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 Frustrations of Eastern Science

K. Deutsch
Science 28 April 1967: 454-456.
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 Prior Preparation Pays

Albert Tonchee
Science 28 April 1967: 456.
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 Canada's Science Council: Incomplete Representation

Wilfred E. Razzell, Robert K. Brown, John R. McGregor, and Thomas M. Nelson
Science 28 April 1967: 456-457.
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 Rabbits First-Then Humans

Gordon Stein
Science 28 April 1967: 457.
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 The Succession at NIH

Philip H. Abelson
Science 28 April 1967: 459.
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 Radiation and the Patterns of Nature

George M. Woodwell
Science 28 April 1967: 461-470.
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 Atom Reactions in Flow Tubes

B. A. Thrush
Science 28 April 1967: 470-473.
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 National Science Board: Its Place in National Policy

Eric A. Walker
Science 28 April 1967: 474-477.
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 Extraordinary Sex Ratios

W. D. Hamilton
Science 28 April 1967: 477-488.
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 The National Academy of Sciences: Profile of an Institution (III)

D. S. Greenberg
Science 28 April 1967: 488-493.
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 NEWS IN BRIEF

Science 28 April 1967: 493.
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 Higher Education: Scrambling for the Philanthropic Dollar

Luther J. Carter
Science 28 April 1967: 494-496.
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 Appointments

Science 28 April 1967: 496.
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 Book Reviews

Science 28 April 1967: 497-499.
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 Book Received

Science 28 April 1967: 499-564.
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Precambrian Fossils (?) near Elliot Lake, Ontario

H. J. Hofmann
Science 28 April 1967: 500-504.
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Mössbauer Analysis of Iron in Clay Minerals

Charles E. Weaver, J. M. Wampler, and T. E. Pecuil
Science 28 April 1967: 504-508.
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Alga-Like Fossils from the Early Precambrian of South Africa

J. William Schopf and Elso S. Barghoorn
Science 28 April 1967: 508-512.
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Uranium Distribution in Rocks by Fission-Track Registration in Lexan Plastic

J. D. Kleeman and J. F. Lovering
Science 28 April 1967: 512-513.
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Red Sea: Detailed Survey of Hot-Brine Areas

John M. Hunt, Earl E. Hays, Egon T. Degens, and David A. Ross
Science 28 April 1967: 514-516.
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Glycerol Excretion by Symbiotic Algae from Corals and Tridacna and Its Control by the Host

Leonard Muscatine
Science 28 April 1967: 516-519.
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Progesterone: Its Possible Role in the Biosynthesis of Cardenolides in Digitalis lanata

E. Caspi and D. O. Lewis
Science 28 April 1967: 519-520.
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Human Polymorphonuclear Leukocytes: Demonstration of Microtubules and Effect of Colchicine

Stephen E. Malawista and Klaus G. Bensch
Science 28 April 1967: 521-522.
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Calcareous Septa Formed in Snail Shells by Larvae of Snail-Killing Flies

L. V. Knutson, C. O. Berg, L. J. Edwards, A. D. Bratt, and B. A. Foote
Science 28 April 1967: 522-523.
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Disinfection by Electrohydraulic Treatment

Merton Allen and Kenneth Soike
Science 28 April 1967: 524-525.
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Turnover of Rat Liver Tyrosine Transaminase: Stabilization after Inhibition of Protein Synthesis

Francis T. Kenney
Science 28 April 1967: 525-528.
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Blastomyces dermatitidis: Production of the Sextual Stage

E. S. Mcdonough and Ann L. Lewis
Science 28 April 1967: 528-529.
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Heritability of Plasma Cholinesterase Activity in Inbred Mouse Strains

Charles R. Angel, Dorsey T. Mahin, Richard D. Farris, Kent T. Woodward, John M. Yuhas, and John B. Storer
Science 28 April 1967: 529-530.
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Bluetongue Virus Infection: Pathologic Responses of Nervous Systems in Sheep and Mice

W. P. C. Richards and D. R. Cordy
Science 28 April 1967: 530-531.
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Natural Free-Running Period in Vertebrate Animal Populations

Charles H. Lowe, David S. Hinds, Peter J. Lardner, and Keith E. Justice
Science 28 April 1967: 531-534.
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 Selective Forces in Papilio glaucus

Timothy Prout and John M. Burns
Science 28 April 1967: 534.
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 National Academy of Sciences

Science 28 April 1967: 535-544.
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 Radiation Protection

Ronald L. Kathren
Science 28 April 1967: 544-550.
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