  How Old Is the Earth?, Patrick M. Hurley, Doubleday & Company, Inc., Garden City, New York, 1959, 160 pp., $1.25. Radiocarbon Dating (second edition), Willard F. Libby, University of Chicago Press, Chicago, Illinois, 1955, 175 pp., $5.00 (hardback); $1.95 (paperback). The Birth and Death of the Sun, George Gamow, The Viking Press, New York, 1949, 238 pp., $4.75 (out of print but available through libraries), $0.60 (paperback) from the New American Library of World Literature, Inc., New York. Inside the Nucleus, Irving Adler, The John Day Company, Inc., New York, 1963, 191 pp., $4.95 (hardback); $0.60 (paperback) from the New American Library of World Literature, Inc., New York. Ages of Rocks, Planets, and Stars, Henry Faul, McGraw-Hill Book Company, New York, 1966, 109 pp., $2.45. Principles of Geochemistry (second edition), Brian Mason, John Wiley & Sons, Inc., New York, 1958, 310 pp., $7.50. (New edition due in 1967.) Potassium Argon Dating, J. H. Zahringer and O. A. Schaeffer, Springer-Verlag New York, Inc., New York, 1966, 250 pp., $12.50. ArticlesA Clock for the Ages: Potassium Argon, Garniss H. Curtis, National Geographic Magazine, 120: 590 (October 1961). Exploring 1,750,000 Years into Man’s Past, L. S. B. Leakey, National Geographic Magazine, 120: 564 (October 1961). Five-Billion-Year Clock, Patrick M. Hurley, Saturday Evening Post, 234: 26 (March 18, 1961). Geologic Time Scale, J. Laurence Kulp, Science, 133: 1105 (April 14, 1961). Geology, Reginald A. Daly, Scientific American, 183: 36 (September 1950). Tracks of Charged Particles in Solids, R. L. Fleischer, P. B. Price, and R. M. Walker, Science, 149: 383 (July 23, 1965). How Old Is It?, Lyman J. Briggs and Kenneth F. Weaver, National Geographic Magazine, 114: 234 (August 1958). Moving Picture of the Last Ice Age, Richard Foster Flint, Natural History, 66: 188 (April 1957). Modern Methods for Measurement of Geologic Time, E. J. Zeller, Mineral Information Service, 18: 9 (January 1965). Single copies are $0.10 from Division of Mines and Geology, Ferry-Building, San Francisco, California 94111. Fluted Projectile Points: Their Age and Dispersion, C. Vance Haynes, Jr., Science, 145: 1408 (September 25, 1964). Unraveling the Age of Earth and Man, E. L. Simons, Natural History, 76: 52 (February 1967). Radiocarbon Dating and Archeology in North America, F. Johnson, Science, 155: 165 (January 13, 1967). Fission-track Dating of Bed I, Olduvai Gorge, R. L. Fleischer and others, Science, 146: 72 (April 2, 1965). Lead Isotopes and the Age of the Earth, G. R. Tilton and R. H. Steiger, Science, 150: 1805 (December 31, 1965). Strontium-Rubidium Age of an Iron Meteorite, G. J. Wasserburg and others, Science, 150: 1814 (December 31, 1965). THE COVER U. S. Geological Survey scientists prepare acetylene gas, made from the carbon-14 in a geological specimen, in a vacuum line. This gas will be fed into a proportional counter to determine the age of the specimen by its ¹4C count. (See “Carbon-14 Counting” beginning on page 12.) THE AUTHOR Geophysicist Henry Faul, an authority on nuclear dating, is professor of Geophysics and chairman of the Department of Geology at the University of Pennsylvania, Philadelphia. He holds a doctoral degree from the Massachusetts Institute of Technology, and has taught at the Universities of Strasbourg and Bern in Europe. Dr. Faul was a geophysicist with the Manhattan Project during World War II, and was formerly chief of the Radiation Laboratory, U. S. Geological Survey, Denver, Colorado. For many years he was engaged in geological age determination work with the Geological Survey and the Carnegie Institution of Washington in Washington, D. C. PHOTO CREDITSFrontispiece courtesy Anthropology Department, Southern Methodist University (SMU) Cover photo courtesy U. S. Geological Survey (USGS)
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