INDEX 



conclusions throw doubt on the his methood of tracing blood 



nebular hypothesis, 14. relationship, 158. 



Mountain, the attraction of, used Observatory, Lick, its 5-foot 



to determine the mass of the reflector and its proposed 100- 



earth, 63. inch reflector, 34 ; at Mt. Wilson, 



Mutants, the production of, 184; its powerful telescopes, 34; the 



produced by chemical and other Potsdam, its 32-inch lens for 



treatment of eggs, 185. star photography, 37. 



Mutation, the new theory of, 180. Optophone, an instrument that 



Natural selection, evolution thro', makes light audible, 312. 



178. Opsonic Index, a test of immunity 



Nebulae, shown by Keeler to be discovered by Sir Almroth 



very abundant, 5; their appear- Wright, 215. 



ance and probable nature, 6, 7 ; Opsonins, their development and 



the spiral nebula as mother of use, 211; how their presence is 



worlds, 8 ; their origin, 17 ; other demonstrated, 214. 



than spiral, 20 ; Arrhenius' the- Osmosis, the theory of Van't Hoff 



ory of their origin, 21; their regarding, 103. 



destiny, 21; as tested by the Ostracoderm, an extinct form 



spectroscope, 21 ; invisible, 25 ; believed by Professor Patton 



their size, 26 ; why they are to be the ancestor of the verte- 



numerous, 26; possibility of brate, 171. 



collision with, 28; ringed, one Ostwald, Prof. Wilhelm, cham- 



that may be seen through a pions the ion theory of Arrhe- 



small telescope, 100. nius, 103, 



Neon, seemingly formed in the Otto, Dr. N. A., develops the oil 



laboratory in a vacuum tube, engine, 285. 



123. Panama Canal Zone, its transfor- 



Neptune, its liquid or gaseous mation, 246; mortality statistics, 

 state, 10 ; invisible to naked eye, 

 that 



34; its density 1.11 that of 

 water, 84. 

 Nicholas, Professor E. R, invents 



248, 252 ; the work of Col. Gor- 

 gas in rendering it healthful 

 affords an inspiring object les- 

 son, 252. 



the radiometer with G. F. Hull, Parallax, of a star, how tested, 



and uses it to measure light 

 pressure, 109; measures the ra- 

 diation of stars and of Saturn 

 and Jupiter, 111. 



Nobel prize, in medicine, given 

 Dr. Alexis Carrel, in 1912, 156; 

 discoveries that have been 

 laureated by, 321. 



45; of the sun, cannot be de- 

 termined with accuracy by direct 

 measurement, 74; of Mars and 

 Eros used as an aid in determin- 

 ing the sun's distance, 75. 

 Park, Dr. Francis E., reports on 

 the use of thorium X, 235. 



Noguchi, Dr. Hideyo, discovers Park > Dr - Wm - H -> reports on in- 



germ of rabies, 234. fant mortality due to impure 



Nott, Dr., first suggested that the milk > 243 - 



mosquito transmits yellow fever, Parseval, Major von, invents and 



248. develops a non-rigid dirigible 



Nuttall, Dr. G. H. F., studies balloon, 289; designs an in- 

 tropical diseases and develops a genious ballonet, to ballast his 

 remedy for cattle plague, 245; airship, 290, 



337 



