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Science, New Series, Vol. 94, No. 2451, Dec. 19, 1941


Previous Issue: New Series, Vol. 94, No. 2450, Dec. 12, 1941
Next Issue: New Series, Vol. 94, No. 2452, Dec. 26, 1941


Front Matter (15 pp.)
Science and National Defense, pp. 571-574
Vannevar Bush

Atmospheric-Electric Disturbances Accompanying the Bright Auroras of March 25, 1940, and September 18, 1941, pp. 574-578
Harlan T. Stetson


Obituary
Walter Mathew Dunagan: May 23, 1894-November 24, 1941, pp. 578-579
Herbert J. Gilkey


Scientific Events
Child Endowment in Australia, p. 579
The Fourth Constitutional Convention of the Congress of Industrial Organizations, pp. 579-580
Fellowships in the Medical Sciences of the National Research Council, p. 580
United States Civil Service Examinations, p. 580
Award of the Charles P. Daly Gold Medal of the American Geographical Society, pp. 580-581


Scientific Notes and News, pp. 581-584


Discussion
On the Precision of Estimates from Systematic Versus Random Samples, pp. 584-585
James G. Osborne
Extra Strong Heliotropic Effect of Neon Lights, pp. 585-586
Cyrus N. Ray
Color Systems, p. 586
D. H. Hamly
Reprints for European Laboratories, p. 586
Chauncey D. Leake


Quotations
A Metonic Span in the Work of the Carnegie Corporation, pp. 586-587
Progress at the Massachusetts Institute of Technology, pp. 587-588


Scientific Books
Franklin's Experiments, pp. 588-589
Benjamin Franklin's Experiments
I. Bernard Cohen
Review author[s]: W. F. Magie


Special Articles
The Extraction of Biotin from Tissues, pp. 589-590
Roy C. Thompson; Robert E. Eakin; Roger J. Williams
Flies as Carriers of Poliomyelitis Virus in Urban Epidemics, pp. 590-591
Albert B. Sabin; Robert Ward


Scientific Apparatus and Laboratory Methods
The Use of Mercury in Contact with Ammonia, pp. 591-592
Richard G. Roberts
A Technique for the Electron Microscopic Examination of Encapsulated Bacteria, p. 592
Evelyn A. Kregel; John W. Appling; Bernard F. Shema; George R. Sears


Books Received, p. 592
Science News, pp. 14a+16a

Previous Issue: New Series, Vol. 94, No. 2450, Dec. 12, 1941
Next Issue: New Series, Vol. 94, No. 2452, Dec. 26, 1941



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