372 
INDEX 
Moore, R. L. On the Relation of a Con- 
tinuous Curve to its Complementary- 
Domains in Space of Three Dimen- 
sions, 33. 
Mutations in datura (Sinnott and Blakes- 
lee), 17. 
National Academy oi^ Sciences, Bache 
Fund, 16. 
Natural selection as a physical principle 
(Lotka), 151. 
Navias, L., and E. W. Washburn. The 
Relation of Chalcedony to the Other 
Forms of Silica, 1. 
Nebulae, dark (Russell), 115. 
Needle, gravitation (Barus), 13, 63, 313, 
327. 
Nerve deafness (Minton), 274. 
NettlETOn, L. L. Characteristics of a 
Short Wave Oscillator at Very Low 
Pressures, 353. 
Nickel, electronic bombardment of (Farns- 
worth), 251. 
NoYES, A., AND Wilson, H. A. The 
Thermal Ionization of Gaseous Ele- 
ments at High Temperatures, 303. 
Orientation, photic (Mast), 240. 
OsBORN, H. F. Hesperopithecus, the 
First Anthropid Primate Found in 
America, 245. 
OsBORN, H. F., AND Reeds, C. A. Reccut 
Discoveries on the Antiquity of 
Man, 246. 
Oscillator, short wave (Nettleton), 353. 
Parallel vectors in geometry (Eisenhart), 
207. 
Parasites of injurious insects (Howard), 
133 
Parker! S. L., see Pearl, R., 212. 
Paths, geometry of (Veblen), 192, 347; 
(Eisenhart), 207, 233. 
Patterson, R. A., see Duane, W., 85. 
Pearl, R. Seasonal Fluctuations of the 
Vital Index of a Population, 76. 
Pearl, R. and Bacon, A. L. Biometrical 
Study of the Relations of Certain 
Viscera in Tuberculosis, 125. 
Pearl, R., and Burger, M. H. The 
Vital Index of Population of England 
and Wales, 1838-1920, 71. 
Pearl, R., and LeBlanc, T. J. A Fur- 
ther Note on the Age Index of a 
Population, 300. 
Pearl, R., and Parker, S. L. On the 
Influence of Density of Population 
upon the Rate of Reproduction in 
Drosophila, 212. 
Pearl, R. and Reed, L. J. A Further 
Note on the Mathematical Theory of 
Population Growth, 365. 
Peat deposits and climatic changes (Dach- 
nowski), 225. 
Persistence of animals (Ruedemann), 54. 
Perturbations of minor planets (Leusch- 
ner), 170. 
Physical quantity, measurement of (She- 
whart), 248. 
Pigment in fish (Wyman), 128; (Gilson), 
130. 
Pinhole resonators (Barus), 66, 96, 119, 
163. 
Planets, minor (Leuschner), 170. 
Polynomial, roots of the derivative of, 
(Walsh), 139. 
Population, age distribution (Lotka), 339. 
Population, age index of (Pearl and 
LeBlanc), 300. 
Population, growth of (Pearl and Reed), 
365. 
Population, vital index of (Pearl and 
Berger),71; (Pearl), 76; (Miner), 106. 
Potassium, crystal structure (McKeehan), 
254. 
Potassium vapor, the ionization of (Wil- 
liamson), 255. 
Potassium vapors, absorption by (Har- 
rison), 260. 
Principal directions in space (Eisenhart), 
24; (Synge), 198, 204. 
Pyrimidines from tubercle bacillus (John- 
son and Brown), 187. 
Quantum integrals (Epstein), 166. 
Radiation of the sun (Abbot, Fowle and 
Aldrich), 177. 
Radiation potentials (Davis), 61. 
Radium emanation, bactericidal proper- 
ties (Marshall), 317. 
Real functions (Blumberg), 283. 
Reed, L. J. See Pearl, R., 365. 
Reeds, C. A., see Osborn, H. F., 246. 
Refraction of X-rays (Davis and Terrill), 
357. 
Regeneration in Amiurus (Chambers), 
186. 
Relativity, rotation in (Franklin), 265. 
Replantation of limbs (Halsted), 181. 
Reproduction and density of population 
(Pearl and Parker), 212. 
Resonators, pinhole (Barus), 66, 96, 119, 
163. 
Ricci's principal directions (Eisenhart), 
24. 
Riemann geometry generalized (Eisen- 
hart and Veblen), 19. 
Rocks, chemical composition of (Clarke 
and Washington), 108. 
Roots of polynomial derivatives (Walsh), 
139. 
Rotation in relativity (Franklin), 265. 
Ruedemann, R. Additional Studies in 
Arrested Evolution, 54. 
. New Forms of Life from the Silu- 
rian, 55. 
Russell, H. N. Dark Nebulae, 115. 
