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Science, New Series, Vol. 119, No. 3099, May 21, 1954


Previous Issue: New Series, Vol. 119, No. 3098, May 14, 1954
Next Issue: New Series, Vol. 119, No. 3100, May 28, 1954


Front Matter (10 pp.)
Mathematics and Federal Support, pp. 3A
Mina Rees

Different Philosophies of Genetics, pp. 703-710
Richard B. Goldschmidt

Some Aspects of the Chemistry and Biochemistry of Cholesterol, pp. 710-716
Louis F. Fieser

News and Notes, pp. 716-726


Book Reviews
----------------, p. 727
The Permian Reef Complex of the Guadalupe Mountains Region, Texas and New Mexico
Norman D. Newell
Review author[s]: Preston E. Cloud
----------------, pp. 727-728
Fields and Waves in Modern Radio
Simon Ramo; John R. Whinnery
Review author[s]: G. E. Mueller
----------------, p. 728
International Review of Cytology
G. H. Bourne; J. F. Danielli
Review author[s]: George H. Mickey
----------------, p. 728
Causality in Natural Science
Victor F. Lenzen
Review author[s]: Henry Margenau
----------------, p. 729
Lehrbuch der Organischen Chemie
Paul Karrer
Review author[s]: Carl P. Schaffner
----------------, pp. 729-730
The Challenge of Our Times: Contemporary Trends in Science and Human Affairs as Seen by Twenty Professors at the University of Wisconsin
Farrington Daniels; Thomas M. Smith
Review author[s]: George R. Harrison
----------------, p. 730
Theory of Equations
Cyrus Colton MacDuffee
Review author[s]: Cleota G. Fry


Technical Papers
The Physiologic Closure of the Ductus Arteriosus in Newborn Infants: A Preliminary Report, pp. 731-732
Frederic L. Eldridge; Herbert N. Hultgren; Mary E. Wigmore
Evidence for a Diurnal Pulse in Stream Phytoplankton, pp. 732-734
John L. Blum
Distribution and Heredity of Blood Factor U, pp. 734-735
A. S. Wiener; L. J. Unger; L. Cohen
Effect of Synthetic Thioctic or Alpha Lipoic Acid on the Voluntary Alcohol Intake of Rats, pp. 735-736
Jorge Mardones; Natividad Segovia; Francisco Alcaino; Arturo Hederra


Communications
Trilobite Protaspids Showing Superfamily Differences, p. 737
Allison R. Palmer
Sclerotia in an Operculate Discomycete, p. 737
Martin A. Rosinski; Richard P. Korf
Recent Progress in the Study of Pacific Coast Paleozoic Faunas, pp. 737-738
C. W. Merriam
New High-Pressure Phases of Silica, pp. 738-739
Robert B. Sosman
Tavorite and Barbosalite: Two New Phosphate Minerals from Minas Gerais, Brazil, p. 739
M. L. Lindberg; W. T. Pecora
A Simplified Method for Determining Radioisotopes in Tissues, pp. 739-740
D. L. Tabern; T. N. Lahr
Mapping Shallow Horizons with the Reflection Seismograph, p. 740
L. C. Pakiser; D. R. Mabey

Previous Issue: New Series, Vol. 119, No. 3098, May 14, 1954
Next Issue: New Series, Vol. 119, No. 3100, May 28, 1954



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