424 
INDEX 
Sex-determining mechanism, possible action 
of the (McClung), 160. 
Sex and sex intergrades in Cladocera (Banta), 
373. 
Sex of parthenogenetic frogs (Loeb), 60. 
Shapley, H. Studies of Magnitudes in 
Star Clusters', VIII. A Summary of 
Results Bearing on the Structure of the 
Sidereal Universe, 224. 
Sidereal universe, structure of (Shapley), 
224. 
Small-ion hypothesis in ionization (Yen), 
91, 106. 
Smith, H. M. Effects of a Prolonged 
Reduction in Diet on Twenty-Five 
Men. III. Influence on Efficiency 
during Muscular Work, 157. 
Smithsonian 'solar constant' expedition to 
Calama, Chile (Abbot), 313. 
Soil flow as a transporting agency (Ekblaw), 
288. 
Soil of Loggerhead Key (Lipman and Way- 
nick), 232. 
Solar constant expedition to Chile (Abbot), 
313. 
Solar motion based on radial velocities 
(Stromberg), 36. 
Solubilities of the nitrates of lead isotopes 
(Richards and Schumb), 386. 
South Sea Islands, petrography of (Iddings 
and Morley), 110. 
Specific heats at high temperatures (White), 
343. 
Spectral characteristics of cepheids (Adams 
and Joy), 129. 
Spectral conditions of the stars (Perrine), 
75. 
Spectrum, absorption, of the novae (Adams), 
354. 
Spectrum, X-ray, of tungsten (Dershem), 
62 
Squares, representation of a number as the 
sum of (Hardy), 189. 
St. Tohn, A. The Crystal Structure of 
Ice, 193. 
Star clusters, magnitudes in (Shapley), 224. 
Stars, double, a study of the motions of 
(Doolittle), 137. 
Stars, double, dependence of spectral rela- 
tion upon distance (Perrine), 71. 
Star, moving, retarded by reaction of radia- 
tion (Page), 47. 
Stars, spectral conditions of (Perrine), 75. 
Stars, spectrum of cepheids (Adams and 
Joy), 129. 
Starvation, effects of (Benedict and Roth), 
149; (Miles), 152; (Smith), 157. 
Stream motion of stars (Stromberg), 36. 
Stromberg, G. A Determination of the 
Solar Motion and the Stream Motion 
Based on Radial Velocities and Abso- 
lute Magnitudes, 36 
Structure of electromagnetic field (Bate- 
man), 140. 
Sublimation of gallium chloride (Richards, 
Craig, and Sameshima), 387. 
Sun's magnetic axis, location of (Seares, 
van Maanen, and Ellerman), 4. 
Tate, J. T., and Foote, P. D. Resonance 
and Ionization Potentials for Electrons 
in Cadmium, Zinc, and Potassium 
Vapors, 9. 
Taxonomic position of actinomyces (Drech- 
sler), 221. 
Terrestrial temperature and atmospheric 
absorption (Abbot), 104. 
Tetanus antitoxin, destruction by chem- 
ical agents (Berg and Kelser), 174. 
Thermo-electric action with dual con- 
duction of electricity (Hall), 98. 
Thermo-electric action with effusion in 
metals (Hall), 297. 
Thermo-electric diagrams on the P-V-plane 
(Hall), 29. 
Thermo-electricity, validity of equation 
P = T dv/dt in (Hall), 11. 
Tortugas, soil of Loggerhead Key (Lipman 
and Waynick), 232. 
Trust Funds of the Academy, research 
grants from, 273. 
Tumors, nerve, heredity of (Davenport), 
213. 
Tungsten X-ray spectrum (Dershem), 62. 
Universe, structure of the sidereal (Shapley), 
224. 
van Maanen, A. The Distances of Six 
Planetary Nebulae, 394. 
van Maanen, A., see Seares, F. H., 4. 
Vapors, mobilities of ions in (Yen), 106. 
Variable stars, spectral characteristics of 
cepheids (Adams and Joy), 129. 
Variation in arcella dentata, (Hegner), 283. 
Vibrating systems, interferometry of (Bar- 
us), 328. 
Volcanic rocks, analyses of (Iddings and 
Morley), 110. 
War organization, minutes of executive 
board of (N. R. C), 122. 
Waynick, D. D., see Lipman, C. B., 232. 
White, W. P. The General Character of 
Specific Heats at High Temperatures, 
343. 
Wilczynski, E. J. Invariants and Canon- 
ical Forms, 300. 
X-Ray crystal penetration, depth of 
(Blake), 236. 
X-Ray spectrometers, resolving powers of 
(Dershem), 62. 
X-Ray spectrum of tungsten (Dershem), 62. 
Yen, K. L. Mobilities of Ions in Air, 
Hydrogen, and Nitrogen, 91. 
. Mobilities of Ions in Vapors, 106. 
Yerkes, Major R. M. Measuring the 
Mental Strength of an Army, 295. 
Zea mays L., inbreeding and crossbreeding 
of (Jones), 246. 
Zinc, resonance potentials for electrons 
(Tate and Foote), 9. 
