612 
INDEX 
Nudibranch, nervous organization (Arey and 
Crozier), 498. 
Operators in group theory (Miller), 272. 
OsBORN, H. F. Seventeen Skeletons of 
Moropus; Probable Habits of this Ani- 
mal, 250. 
. Palaeomastodon, the Ancestor of the 
Long- Jawed Mastodons only, 265. 
Osmosis (Loeb), 440. 
Palaeomastodon (Osbom), 265. 
Paleogeography (Ruedemann), 1. 
Palmer, L. S. Growth and Reproduction 
in Fowls in the Absence of Carotinoids 
and the Physiological Relations of 
Yellow Pigmentation to Egg Laying, 
582. 
Parallaxes of brighter stars (Adams and 
Stromberg), 228. 
Pearl, R. Mean Age at Death of Cen- 
tenarians, $3. 
. The Embryological Basis of Human 
Mortality, 593. 
Pfund, a. H. a Vapor-free Vacuum Seal, 
221. 
Perrine, CD. Distribution of the Aphelia 
of the Secondary Bodies of the Solar 
System, 371. 
Phone and phonometer (Webster), 173. 
Phonograph, theory of (Webster), 275. 
Phototropism, of Fucus spores and rhizoids, 
(Hurd),201. ^ 
Planets, perturbations of (Leuschner), 67. 
Plough, H. H. Linear Arrangement of 
Genes and Double Crossing Over, 167. 
Pneumonia and the Vagus Nerve (Meltzer 
and Wollstein), 493. 
Powder gases (Webster), 286. 
Power series (Gronwall), 22. 
Pre-Cambrian paleogeography (Ruedemann), 
Pressure in guns (Webster), 259. 
Projectiles from guns, rotating (Abbot), 386. 
Projectiles, speed of (Abbot), 388. 
Proliferation in Begonia Phyllomaniaca 
(Smith), 36. 
Protein producing fat (Atkinson and Lusk), 
246. 
Perturbations of the Watson Planets 
(Leuschner), 67. 
Pyrrol, etc. (Franklin), 580. 
Radiation from magneton (Bateman), 367. 
Radiation, solar (Abbot), 383. 
Radiationless orbits (Wilson), 588. 
Rats, theory of genes (Castle), 126. 
Reed, H. S. and Holland, R. H. Growth 
Rate of an Annual Plant Helianthus, 
135. 
Report of the annual meeting of the Acad- 
emy, 479. 
Report of the autumn meeting, 87. 
Research Council, see National Research 
Council. 
Research grants from the trust funds of the 
^ Academy, 492. 
Rhizoids, phototropism of (Hurd), 201. 
Rouiller, C. a. Metallic Derivatives of 
Ethyl Thioglycollate, 145. 
Ruedemann, R. Some Fundamentals of 
Pre-Cambrian Paleogeography, 1. 
Russell, H. N. Problems of Sidereal As- 
tronomy, 391. 
Sand, angle of repose (Webster), 263. 
Seares, F. H. Relation of Color to Intrin- 
sic Luminosity in Stars of the same Spec- 
tral Type, 232. 
Seares, F. H., van Maanen, A. and El- 
LERMANN, F. Deviations of Sun's 
General Magnetic Field from that of a 
uniformly Magnetized Sphere, 242. 
Shapley, H. Magnitudes in Star Clusters, 
IX, the Distances and Distribution of 
Seventy Open Clusters, 344. 
. Magnitudes in Star Clusters, X. 
Spectral Type B and the Local Stellar 
System, 434. 
Shapley H. and Nicholson, S. B. Spec- 
tral Lines of a Pulsating Star, 417. 
Shimizu, T., see Duane, W., 198. 
Sidereal Astronomy, problems of (Russell), 
Skin, temperature of (Benedict, Miles and 
Johnson), 218. 
Smith, Erwin F. The Cause of Prolifera- 
tion in Begonia Phyllomaniaca, 36. 
Solar Constant of Radiation (Abbot), 383. 
Solar system, aphelia in (Perrine), 371. 
Southwest, archaeology of (Nelson), 114. 
Spatial relations of genes (Sturtevant,. 
Bridges and Morgan), 168. 
Specific heat of liquids (Barus), 340. 
Spectra of stars (Russell), 392. 
Spectral lines of pulsating star (Shapley and 
Nicholson), 417. 
Spectral type of stars (Seares), 232. 
Spectrum, energy distribution (Webster), 
163. 
Spectrum fringes (Barus), 149. 
Speed of projectiles (Abbot), 388. 
Star clusters, magnitudes in (Shapley), 344^ 
434. 
Stark, M. B. Benign Tumor that i& 
Hereditary in Drosophila, 573. 
Stars of high radial velocity (Adams and 
Joy), 239. 
Star streaming (van Maanen), 225. 
Steel, constitution of (Campbell), 426. 
Steiger, G., see Clarke, F. W., 6. 
Stellar parallaxes (Adams and Stromberg),. 
228. 
Stieltjes integral (Carmichael), 551. 
Stout, A. B. Bud Variation, 130. 
Stream Motion, stellar (van Maanen), 225. 
Stromberg, G., see Adams, W. S., 228. 
Sturtevant, A. H., Bridges, C. B., and 
Morgan T. H. Spatial Relations of 
Genes, 168. 
