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Science, New Series, Vol. 40, No. 1020, Jul. 17, 1914


Previous Issue: New Series, Vol. 40, No. 1019, Jul. 10, 1914
Next Issue: New Series, Vol. 40, No. 1021, Jul. 24, 1914


Front Matter (1 p.)
The Principles of the Theory of Mutation, pp. 77-84
Hugo de Vries

The Problem of Lighting in Its Relation to the Efficiency of the Eye, pp. 84-91
C. E. Ferree

Carl Fuchs, pp. 91-92
Frank E. Blaisdell

Estimates of Population, pp. 92-94
Scientific Notes and News, pp. 94-97
University and Educational News, pp. 97-98


Discussion and Correspondence
Lightning Flashes, p. 98
Cleveland Abbe
A New Form of Collecting Pipette, pp. 98-99
Arthur M. Banta
Is Melanism Due to Food?, pp. 99-100
Wm. T. Cox


Scientific Books
----------------, pp. 100-103
Igneous Rocks
Joseph P. Iddings
Review author[s]: Whitman Cross
----------------, pp. 103-105
Allen's Commercial Organic Analysis
W. A. Davis; Samuel S. Sadtler
Review author[s]: Lafayette B. Mendel
----------------, pp. 105-107
Some Minute Animal Parasites or Unseen Foes in the Animal World
H. B. Fantham; Annie Porter
Review author[s]: Gary N. Calkins


Special Articles
Direct Proof through Non-Disjunction That the Sex-Linked Genes of Drosophila Are Borne by the X-Chromosome, pp. 107-109
Calvin B. Bridges
Hot Water Treatment for Cotton Anthracnose, pp. 109-110
H. W. Barre; W. B. Aull


The American Chemical Society. IV, pp. 110-114
Charles L. Parsons

Previous Issue: New Series, Vol. 40, No. 1019, Jul. 10, 1914
Next Issue: New Series, Vol. 40, No. 1021, Jul. 24, 1914



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