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Science, New Series, Vol. 117, No. 3047, May 22, 1953


Previous Issue: New Series, Vol. 117, No. 3046, May 15, 1953
Next Issue: New Series, Vol. 117, No. 3048, May 29, 1953


Front Matter (1 p.)
The Forest Insect Problem, p. 3
W. L. Baker

Carbon Isotope Effects in Biological Systems, pp. 541-545
Donald L. Buchanan; Akira Nakao; George Edwards

Forest Ray Moulton: 1872-1952, pp. 545-546
A. J. Carlson

News and Notes, pp. 546-550
Erratum, p. 550


Technical Papers
Effect of Nuclear Counting Procedures on Determination of the Desoxypentosenucleic Acid Content of Rat Liver Cell Nuclei, pp. 551-553
S. Albert; Ralph M. Johnson; Renée R. Wagshal
Biosynthesis of C14-Specifically Labeled Cotton Cellulose, pp. 553-554
Glenn A. Greathouse
A Cage for Rearing Predator-Prey Populations of Mites, pp. 554-555
Thomas Burnett
Growth and Regeneration in Hevea Seedlings, pp. 555-556
T. J. Muzik
The Nature of Perceptual Processes, pp. 556-558
Rayford T. Saucer
Inhibition of Tobacco Mosaic Virus Biosynthesis by 2-Thiopyrimidines, pp. 558-559
Frank L. Mercer; Taylor E. Lindhorst; Barry Commoner
A Snail Intermediate Host of the Rabbit Parasite Hasstilesia tricolor (Trematoda: Brachylaemidae), pp. 559-560
William B. Rowan
Polarograms of Oxygen in Lake Water, pp. 560-561
K. G. Wood
Relationship of Colloids to the Surface Tension of Urine, pp. 561-563
Robert A. Ravich
Production of Folinic Acid from Folic Acid by Lactobacillus casei, pp. 563-564
T. J. Bond
The Life History of Echinoparyphium flexum (Linton 1892) (Dietz 1910) (Trematoda: Echinostomidae), pp. 564-565
Haig H. Najarian
The Cultivation of Hydra under Controlled Conditions, pp. 565-566
W. F. Loomis
An Ultrafilterable Growth Factor for Tissue Culture, p. 566
Sheldon Rosenberg; Paul L. Kirk


Comments and Communications
Science Teaching in the Secondary Schools, p. 567
Anton Postl
Science Teaching in the Secondary Schools, p. 567
Anton Postl
Employment and Education Fair in Science, pp. 567-568
John F. Codington
Science Versus Administration in Certain U. S. Foreign Aid Efforts, pp. 568-569
J. R. King


Book Reviews
----------------, p. 570
The Algae of Illinois
Lewis Hanford Tiffany; Max Edwin Britton
Review author[s]: G. W. Prescott

Previous Issue: New Series, Vol. 117, No. 3046, May 15, 1953
Next Issue: New Series, Vol. 117, No. 3048, May 29, 1953



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