INDEX 



Land vehicles, stabilized by the 

 gyroscope, 271. 



Langley, Professor Samuel W., 

 invents the bolometer, an in- 

 strument that measures the one- 

 hundred-millionth of a degree 

 of temperature, 107; charts the 

 infra-red region of invisible 

 light with the bolometer, 108; 

 experiments in flying, 295 ; his 

 successful model "aerodrome," 

 296. 



Laplace, and the nebular hypoth- 

 esis, 7. 



Lazear, Dr., lost his life demon- 

 strating that the mosquito trans- 

 mits yellow fever, 249. 



Lebedew, Professor, measured the 

 pressure of light simultaneously 

 with Nichols and Hull but in- 

 dependently, 110. 



Life, juggling with, Chapter V, 

 142. 



Light, beyond the visible spectrum, 

 106; the pressure of, measured 



individual, 149; his experiments 

 with planarians, growing new 

 heads and bodies, 151, 152; in 

 association with Mr. F. W. 

 Bancroft, experiments to pro- 

 duce mutants by heat, 185. 



Loeb, Dr. 'Leo, made tentative 

 experiments in the cultivation 

 of tissues outside the body, 165 ; 

 his attempt to develop a cancer 

 cure, 231. 



Lowell, Professor Percival, thinks 

 the lines of Mars prove that it 

 is inhabited, 87. 



Lupus, treated by Finsen with 

 ultraviolet ray, 240. 



MacDougal, Dr. D. T., produces 

 mutations by chemical treat- 

 ment of the ovaries, 185. 



Mackenzie, Professor John, his 

 presentation of Reynolds' theory 

 of the ether, 136; his experi- 

 ments with a bag of sand to ilr 

 lustrate the new theory of grav- 

 itation, 139. 



by Professors E. F. Nichols and Magnetic compass, defects of, 256. 



G. F. Hull, 109; the wave the- Magnetism, terrestrial, influenced 



ory of, challenged in recent by sun spots, 105. 



years, 133 ; as a germicide, 239 ; Malaria, transmitted only by 



made audible by the optophone, mosquito of genus Anopheles, 



311. 249. 



Light-pressure, as explaining the Mammals, the relationship of dif- 



origin of nebulae, 21 ; as in- 

 fluencing the movement of 

 nascent stars, 51; measured by 

 Lebedew and by Nichols and 

 Hull, 109. 



Lodge, Sir Oliver, perfected a 

 coherer to detect electric waves, 

 308. 



ferent tribes traced by the 

 blood-test method, 164. 

 Man, his relationship with the 

 lower animals traced by Dr. 

 Nuttall's blood-test method, 163 ; 

 his invertebrate ancestors, ac- 

 cording to Professor Patten, 

 173. 



Loeb, Professor Jacques, his ex- Marconi, Signer G., in conjunction 



periments in the development 

 of unfertilized eggs of the sea 

 urchin, and of the frog, 143; 

 develops two individuals from a 

 single sea urchin embryo, 147; 

 develops two organisms joined 

 together by a bridge of tissue, 

 148 ; fuses two or more eggs of 

 the star fish to form a single 



with Professor Braun, receives 

 Nobel prize for perfection of 

 wireless telegraph, 305; per- 

 fected the coherer and made 

 practical demonstrations of 

 wireless telegraphy, 309. 

 Mariaschein, of Bohemia, made 

 accurate tests of the mass of 

 the earth, 65. 



335 



