INDEX. 



xvii 



John Huston Finley, LL.D., xii 

 Stephen Alfred Forbes, Ph.D., 



LL.D., xii 

 Chevalier Jackson, M.D., xii 

 Dayton C. Miller, A.M., D.Sc, 



xii 

 George D. Rosengarten, Ph.D., 



xii 

 Albert Sauveur, S.B., xii 

 William Albert Setchell, A.M., 



Ph.D., xii 

 Julius O. Stieglitz, A.M., Ph.D., 



xii 

 Ambrose Swasey, Sc.D., D.E., xii 

 Membership resigned : 



Edison, Thomas A., xii 

 Miller, parallaxes of fifty stars de- 

 termined at Sproul Observatory, 

 xiv 



Sproul Observatory eclipse ex- 

 pedition, June, 1918, coronal arches 

 and streamers, 272 



Millikan, some scientific aspects of 



the meteorological work of the 



United States Army, 133 

 Minutes, iii 



Mitchell, flash spectrum, 265 

 Mook and Osborn, characters and 



restoration of the sauropod genus 



Camarasaiiriis Cope, 386 

 Mt. Wilson Observatory expedition 



to the Solar eclipse of 1918, 255 



N 



«th degree, graphical representation 



of functions of the; 236 

 New method in exterior ballistics, 382 

 Night haze, self-luminous, 182 

 Nipher, graphical representation of 



functions of the »th degree, 236 







Ocean currents, detection of by ob- 

 serving their hydrogen-ion concen- 

 tration, 150 



Ores and metals, polarized light in 

 the study of, 401 



Osborn, energy conception of the 

 cause of evolution, vi 



ores and metals, polarized light 



in the study of, 401 



Osborn and Mook, characters and 

 restoration of the sauropod genus 

 Camarasanrus Cope, 386 



Pearl, relative contribution of the 

 staple commodities to the national 

 food consumption, 182 



Pellagra, relation of diet to, 41 



Photo-electric photometry of the 1918 

 Solar eclipse, 269 



Planevector potentiometer measure- 

 ments at telephonic frequencies, al- 

 ternating current, 97 



Polarized light in the study of ores 

 and metals, 401 



Prince, Tatar material in Old Rus- 

 sian, 74 



Prominences and coronal arches, 259 



R 



Redfield, an international treaty 

 which resulted in a league of na- 

 tions, xiii 



Russian, Tatar material in Old, 74 



Sanitary science, application of, to 

 the Great War in the zone of the 

 army, 317 



Schoff, present tendencies in the na- 

 tional development of waterways, v 



Scientific aspects of the meteorolog- 

 ical work of the U. S. Army, 133 



Self-luminous night haze, 223 



Sex inheritance in Spharocarpos, ba- 

 sis of, 289 



Shapley, star cluster and their con- 

 tribution to the knowledge of the 

 universe, Z27 



Siluridae, Luciopimelodinas, a new 

 subfamily of the South American, 

 448 



Shull, sterility and self-and-cross- 

 incompatibility in shepherd's purse, 

 vii 



Snyder, cosmic force, radioaction, v 



Solar eclipse of June, 1918, expedi- 

 tion from Lick Observatory, 241 



• — — ■ Lowell Observatory, 



259 



• McCorm,ick Observa- 

 tory, 265 



' ■ Sproul Observatory, 



272 



■ University of Illinois 



Observatory, 269 



Expedition from Mt. Wilson 



Observatory, 255 



• Yerkes Observatory, 



282 



Spectrum, flash, 265 



Sphccrocarpos, basis of sex inheri- 

 tance in, 289 



Star clusters and their contribution 

 to the knowledge of the universe, 

 2Z7 



