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Science, New Series, Vol. 116, No. 3003, Jul. 18, 1952


Previous Issue: New Series, Vol. 116, No. 3002, Jul. 11, 1952
Next Issue: New Series, Vol. 116, No. 3004, Jul. 25, 1952


Front Matter (1 p.)
Agricultural Research Institute, p. 3
LeRoy Voris

Microbial Selection, pp. 45-51
Vernon Bryson; Waclaw Szybalski

News and Notes, pp. 51-56


Technical Papers
Disease Resistance and Early Testing of Maize, pp. 57-58
C. C. Wernham
Chemical Constitution and Biological Activity of Some Organophosphorus Compounds, pp. 58-60
D. Ramaswami; E. R. Kirch; Elizabeth H. Jenney
The Recording of Flight Movements in Insects, pp. 60-61
Edward G. Boettiger; Edwin Furshpan
Paleobotanical Investigations in Naval Petroleum Reserve No. 4, Alaska, pp. 61-62
Chester A. Arnold
Nomographs for Determining Seiche Periods, pp. 62-63
James L. Verber
Analysis of Growth of the Chick Marginal Blastoderm, pp. 64-65
Allen B. Schlesinger
On the Nature of the So-Called Background Material in Estrogen Fractions of Extracts Prepared from Hydrolyzed Urine, pp. 65-66
Josephine B. Garst; Harry B. Friedgood
Inbred Strains of Culex Mosquitoes, pp. 66-67
J. B. Kitzmiller


Comments and Communications
Vitality of the Aged, pp. 67-68
Robert J. Myers
Vitality of the Aged, pp. 67-68
Robert J. Myers
Science and Technology in Unesco, pp. 68-70
Maurice B. Visscher
Perpetual Motion and Perpetual Research, pp. 70-71
Walter Rose; J. J. Brown


Book Reviews
----------------, p. 71
Die Sonnenkorona: Beobachtungen der Korona 1939-1949
M. Waldmeier
Review author[s]: K. W. Meissner
----------------, pp. 71-72
Organic Chemistry
J. P. Wibaut
Review author[s]: Robert C. Elderfield
----------------, p. 72
The Geography of Europe
D. Hubbard
Review author[s]: Ralph E. Olson
----------------, p. 72
The Chemistry of Lignin
Friedrich Emil Brauns
Review author[s]: Ralph L. Hossfeld

Previous Issue: New Series, Vol. 116, No. 3002, Jul. 11, 1952
Next Issue: New Series, Vol. 116, No. 3004, Jul. 25, 1952



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