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Science, New Series, Vol. 65, No. 1681, Mar. 18, 1927


Previous Issue: New Series, Vol. 65, No. 1680, Mar. 11, 1927
Next Issue: New Series, Vol. 65, No. 1682, Mar. 25, 1927


Front Matter (4 pp.)
Some Recent Speculations on the Nature of Light, pp. 265-271
Edwin B. Wilson

The Conception of a Species, pp. 271-273
C. C. Hurst

International Critical Tables, p. 273
Vernon Kellogg


Scientific Events
Excursion of the International Soil Science Congress, pp. 273-274
The Scientific Division Committee of the United States Fisheries Association, p. 274
Fellows of the Royal Society of Edinburgh, pp. 274-275
National Research Fellowships in the Biological Sciences, p. 275
Frank R. Lillie


Scientific Notes and News, pp. 275-279
University and Educational Notes, p. 279


Discussion and Correspondence
The Color of Hydrated Silica and Alumina, pp. 279-280
P. G. Nutting
A Criterion for Distinguishing Identical Twins from Fraternal Twins, p. 280
Taku Komai
The "Tearing Method", p. 280
Lecomte du Nouy
Study of Bartlett Pear Black-End Undertaken in California, pp. 280-281
M. J. Heppner


Scientific Books
----------------, pp. 281-282
Man and Weather
Alexander McAdie
Review author[s]: Burton M. Varney
----------------, p. 282
Nomenclator animalium generum et subgenerum
Review author[s]: Walter Landauer


Special Articles
The Influence of Selective and General Irradiation by a Quartz Mercury Arc Lamp upon the Germination and Growth of Seeds, pp. 282-284
Charles Sheard; George M. Higgins
The Effect of Sodium Bicarbonate on the Titration of Iodine with Thiosulfate, p. 284
O. E. Schupp


Science News, pp. x+xii+xiv

Previous Issue: New Series, Vol. 65, No. 1680, Mar. 11, 1927
Next Issue: New Series, Vol. 65, No. 1682, Mar. 25, 1927



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