MIRACLES OF SCIENCE 



202; as applied to the marriage 

 of defectives, 203. 



Hertz, his studies of electro-mag- 

 netic waves prepared the way 

 for the wireless telegraph, 306. 



Hewitt, Mr. Peter Cooper, his 

 quartz lamp as a sterilizer, 243. 



Hinks, Professor A. R., made ela- 

 borate mathematical calculations 

 of the solar parallax based on 

 photographs of the planetoid 

 Eros, taken at twelve observa- 

 tories, 80. 



Hoff, S. S., completed Eir David 

 Gill's studies of spectrograms 

 testing the sun's parallax, 79. 



Hoffman, with Schandinn, the 

 discoverer of the germ of syph- 

 ilis, 234. 



Holmes, Professor S. J., produces 

 many planarians by cutting an 

 individual into pieces, 151. 



Holland, Mr. John P., developer 

 of the sub-marine vessel, 287. 



Huggins, Sir Wm., used the 

 spectroscope in star tests in 

 1863, 33. 



Hull, Professor G. F., invents 

 a radiometer jointly with E. F. 

 Nichols and uses it to test light 

 pressure, 109. 



Hydroaeroplane, first used by M. 

 Fabre, in France; developed by 

 Mr. Glenn H. Curtis, 302. 



Hydrogen, found by spectroscope 

 in the stars, 23. 



Immunity to disease, how ex- 

 plained, 210; explained by the 



ex- 



Ion, the theory of, as put forward 

 by Arrhenius, 102; their migra- 

 tion first measured by Sir Oliver 

 Lodge, 102. 



Juggling with life, Chapter V, 

 142. 



Jupiter, its liquid or gaseous state, 

 10; its new moons discovered 

 by Perrine, 13 ; its density about 

 1.33 that of water, 84; would 

 require more than 317 globes 

 like ours to balance its weight, 

 84 ; its thermal effect measured 

 by Professor Nichols, 111. 



Kapteyn, Professor J. C, his 

 photographic charts, 42; his 

 photographic method of measur- 

 ing a star's parallax, 45 ; his esti- 

 mate of the relative brightness 

 of stars, 53 ; discovers that stars 

 in our neighborhood are moving 

 in two gigantic streams, 56. 



Keeler, Professor J. E., studies 

 flie nebulae, 5; his studies of 

 nebulae contradict nebular hy- 

 pothesis, 7. 



Kidney, of a cat or dog, trans- 

 planted by Dr. Carrel, 157. 



King, Dr. A. F. A., suggested that 

 the mosquito transmits malaria, 

 248. 



Kober, Dr. Geo. M., estimates the 

 monetary loss from typhoid fe- 

 ver, 214. 



Koch, Dr. Robt, his discovery of 

 tuberculin, 216; heads a commis- 

 sion to study sleeping sickness, 

 244. 



Korn, Prof., invents apparatus for 



Vaccine 

 orv 



t 



?*>" '' his telautograph, 



Insanity, its inheritable features, Lake, Mr. Simon, developer of the 



206. even keel submarine vessel, 



Ihvertebrates, named by Lamarck 287 - 



and classified by Cuvier ; the Lamarck, Jean Baptiste, originated 



newer view of their relation to the terms vertebrate and inver- 



vertebrates, 172. tebrate, 171. 



334 



