MIRACLES OF SCIENCE 



Dirigible balloon, the, 288. Electron, or electric corpuscle, 



Dominant characters explained in the smallest thing in the world, 



the Mendelian sense, 193. 



Double stars, their periods of rev- 

 olution, 95. 



Driesch, Professor Hans, his ex- 

 periments with the eggs of fish, 



discovered by Sir J. J. Thom- 

 son, 126; in the cathode ray, 

 the constituent of the beta ray, 

 and liberated in a gas subjected 

 to the X-ray or to radio-action, 

 127; its infinite littleness, 129; 

 sets up waves in the ether that 

 produce the phenomena of ra- 

 diant energy, 133 ; how electrons 

 are counted, 127. 



Electroscope, its tests are 500,000 

 times more delicate than the 

 finest tests of the spectroscope, 

 115; detects a single alpha par- 

 ticle, 116. 



origin, 8; its actual motion in Energy, radiant, measured by the 

 space, 39; testing its mass with radiometer, 109. 

 a pendulum, 61; the Cavendish Eros, measurement of its parallax 

 method of testing its mass, 63; furnishes one of the most ac- 

 Professor Boys' determination curate methods of determining 

 of its mass, 64; Professor the sun's distance, 77, 80. 

 Poynting's determination of its Ether, the all-pervading, 131; 

 mass with the balance, 65 ; its newest theories as to its nature, 



146. 

 Dumont, M. Santos, the first to 



demonstrate the feasibility of 



directing the flight of a balloon, 



288. 

 Duyne, Dr. Van, his experiments 



in growing hydra-headed plan- 



arians, 152. 

 Earth, the new explanation of its 



average mass about 5^ times 

 that of an equal globe of water, 

 66; oscillates in common with 

 the moon about a center some 

 2,880 miles from its geometri- 

 cal center, 68. 



134; Sir J. J. Thomson's esti- 

 mate of its density, 135 ; Profes- 

 sor Osborne Reynolds' theory 

 of its nature, 136; invoked in 

 explanation of gravitation by 

 Professor Reynolds, 139. 



Edison, Mr. Thos. A., sent wire- Eugenics, the Galton Institute of, 

 less messages from a moving 199. 



Eugenics, the new science chris- 

 tened by Francis Galton, 200 ; as 

 studied by Professor Davenport, 

 202; some practical rules con- 

 cerning, 204; its future applica- 



tion, 207. 



velop by Professor Loeb, 143. ,_ . ~ . . 



L^JL T/__r T>_I 1^-1.^ Evening Primrose, how used by 



Prof, de Vries to develop his 

 mutation theory, 183. 



train in 1887, 307. 



Eddington, Professor A. S., his 

 estimate of the accuracy of 

 parallax determinations, 45. 



Eggs, unfertilized, caused to de- 



Ehrlich, Professor Paul, his tenta- 

 tive cure for cancer, 167; his 



personality, 222; his discovery ~ , . ., 



of Salvarsan, 223 ; discovers new Evolution through natural selec- 



types of white blood corpuscles, tlon ' 178 ' 



225 ; his side-chain theory of Exploring the atom, Chapter IV, 



immunity, 225 ; develops a tenta- 101 



tive remedy for sleeping sick- Eye, the human, in inheritance, 



ness, 230; investigates cancer as illustrating Mendelian prin- 



in mice, 231. ciples, 201. 



332 



