INDEX 
Abbot, C. G., and Aldrich, L. B. The 
Pyranometer : An Instrument for Meas- 
ing Sky Radiation, 333. 
Absorption of light in space (Shapley), 12. 
Absorption of soft X-rays (Miller), 441. 
Acids, excreted by roots (Haas), 561. 
Acids and bases, equilibrium in sea water 
(Henderson and Cohn), 618. 
Activity of ions of hydrochloric acid (Ellis), 
83. 
Adams, F. D., and Dick, W. J. The Exten- 
sion of the Montana Phosphate De- 
posits Northward into Canada, 62, 
Adams, W. S. Investigations in Stel- 
lar Spectroscopy. I. A Quantitative 
Method of Classifying Stellar Spectra, 
143. 
. Investigations in Stellar Spectros- 
copy. II. A Spectroscopic Method of 
Determining Stellar Parallaxes, 147. 
. Investigations in Stellar Spectros- 
copy. II. Application of a Spectro- 
scopic Method of Determining Stellar 
Distances to Stars of Measured Paral- 
lax, 152. 
— — . Investigations in Stellar Spectros- 
copy. IV. Spectroscopic Evidence for 
the Existence of Two Classes of M Type 
Stars, 157. 
Adams, W. S., and Shapley, H. The Spec- 
trum of d Cephei, 136. 
Adsorption, its part in nerve-conduction 
(Mayer), 37. 
Aeronautics, problems in (Squier), 740. 
Aeroplane in gusts (Wilson), 294. 
Aeroplanes, dynamical stability (Hunsaker), 
278. 
Albedo of planets and satellites (Russell), 
74. 
Albinism, human (Jenks), 164. 
Alcohol, effect on psycho-physiological proc- 
esses (Miles), 703. 
Alcoholic solutions, ionization in (Keyes 
and Winninghoff), 342. 
Alcoholism, effect of parental on progeny 
(Pearl), 380, 675. 
AxDRiCH, L. B., see Abbot, C. G., 333. 
Algae, fossil, in petroleum shales (Davis), 
114. 
Algae, marine Pacific (Farlow), 424. 
AlkaH in production of protein (Falk), 557. 
Amalgams, conductivity of (Lewis and 
Hine), 634. 
Ameba feeding, surface-tension theory of 
(Mast and Root), 188. 
American oaks (Trelease), 626. 
Ammines, cobalt (Harkins, H ill 'and Rob- 
erts), 598. 
Analysis situs (Moore), 270. 
Animals and man, method of studying be- 
havior (Yerkes), 631. 
Annual Meeting, Report of, 300. 
Anomalous dispersion (St. John), 458; 
(King), 461. 
Anthropological Explorations (HrdliSka), 
32. 
Arthropods, earliest fresh-water (Schuchert) 
726. 
Art, American aboriginal (Wissler), 224. 
Asbestiform Minerals (Taber), 659. 
Asymptotic expressions in linear differen- 
tial equations (Milne), 543. 
Atmosphere of sun, minute structure of 
(Hale and EUerman), 102. 
Atolls, Murray- Agassiz theory (Mayer), 28. 
Atolls, origin of Fiji (Davis), 471. 
Atonuc theory, steric hindrance and free 
radicals (Lewis), 586. 
Atoms, hydrogen-helium structure (Har- 
kins), 216. 
Atwood, W. W., and Mather, K. F. Geo- 
graphic History of the San Juan Moun- 
tains since the close of the Mesozoic 
era, 177. 
Banta, a. M. Sex Intergrades in a Species 
of Crustacea, 578. 
Barrell, J. Dominantly Fluviatile Ori- 
gin under Seasonal Rainfall of the Old 
Red Sandstone, 496. 
. The influence of Silurian-Devonian 
Climates on the Rise of Air-Breathing 
Vertebrates, 499. 
Barus, C. Interferometer Methods ased 
on the Cleavage of a Diffracted Ray, 
275. 
. Channeled Grating Spectra. Ob- 
tained in Successive Diffractions, 378. 
, The Interferences of Spectra Both 
Reversed and Inverted, 576. 
. Path Differences within which Spec- 
trum Interferences are Observable, 609 
. Non-Reversed Spectra of Restricted 
Coincidence, 614. 
Bauer, L. A. Concomitant Changes in 
Terrestrial Magnetism and Solar Radia- 
tion, 24. 
Baxter, G. P., and Starkweather, H. W. 
A Revision of the Atomic Weight of 
Tin, 718. 
Becker, G. F. A Possible Origin for Some 
Spiral Nebulae, 1 
Behavior in man and animals, new method 
of studying (Yerkes), 631. 
Behavior of monkeys and apes (Yerkes), 639. 
Behavior of sea-anemones (Parker), 450. 
75! 
