CONTENTS 
Page 
Chemistry. — An Apparent High Pressure Due to Adsorption, the Heat of 
Adsorption, and the Density op Gas-Mask Charcoals 
' By William D. Harkins and D. T. Ewing 49 
Anthropoi<ogy. — Centrai. American Cai^endars and the Gregorian Day .... 
• By Herbert J. Spinden 56 
Physics. — The Torsionai^ Magnetic Energy Absorption of an Iron Con- 
ductor By Carl Barus 59 
Physioi^ogy. — The Adjustment to the Barometer of the Hematorespiratory 
Functions in Man By Yandell Henderson 02 
Physics. — A Study of Absorption Spectra with the Ei^Ectric Furnace. ..... 
By Arthur S. King 63 
Physics. — A Study of the Effect of a Magnetic Fiei.d on Electric Furnace 
Spectra By Arthur S. King 65 
Genetics. — Selective Fertilization in Pollen Mixtures . . . .By D. F. Jones 66 
Mathematics. — Groups Generated by Two Operators, si, s^, Which Satisfy 
THE Conditions ^i"* = ^s", (5152)^ = I, 51^2 = ^2^1 By G. A. Miller 70 
Ctenetics. — Model of the Linkage System of Eleven Second Chromosome- 
genes OF Drosophila By W. E. Castle 73 
Zoology. — The Development of Connective Tissue in the Amphibian 
Embryo By George A. Baitsell 77 
Pathology. — Calcium and Mag^jesium Metabolism in Certain Diseases .... 
By Frank P. Underhill, James A. Honeij and L. Jean Bogert 79 
Astronomy. — The Larger Opportunities for Research on the Relations of 
Solar and Terrestrial Radiation By C. G. Abbot 82 
Zoology. — On the Hyperplasia of Nerve Centers Resulting from Excessive 
Peripheral Loading By S. R. Detwiler 96 
