GENERAL INDEX 



carbons for, invented by 

 Carr6, 6, 227; incandescent, 



6, 228; Thos. A. Edison's in- 

 vention of the incandescent 

 lamp, 6, 228; defects of 

 platinum wire as filament for 

 incandescent lamp, 6, 230; 

 carbon as a filament for in- 

 candescent lamp 6, 233; 

 method of preparing carbon 

 filament for incandescent 

 lamp, 6, 233; the tungsten 

 lamp, 6, 234; advantages and 

 defects of tungsten lamp, 6, 

 235; Mercury- vapor light of 

 Peter Cooper Hewitt, 6, 

 236. 



Electric Railways, the develop- 

 ment of, 7, 175; the first 

 practical cable system in- 

 vented by Andrew S. Hallidie, 



7, 177; the small circular 

 railway built by Thomas 

 Davenport, 7, 178; the elec- 

 tro-magnetic locomotive of 

 Moses G. Farmer, 7, 179; the 

 small working-motor exhib- 

 ited by Thomas Hall, 7, 179; 

 the efforts of Professor Page 

 to produce a storage-battery 

 car, 7, 1 80; the experiments 

 of Siemens and Halske with 

 electric motors, 7, 181; the 

 Edison electric locomotive, 

 7, 182; third rails and trolleys, 

 7, 184; the inventions of 

 Daft and Van Depoele, 7, 

 185; the work of Frank 

 J. Sprague in developing 

 electric railways, 7, 186; 

 the storage battery line built 

 by E. Julien, 7, 188; im- 

 provements made by Anthony 

 Rackenzaun, 7, 189; the 

 Edison storage-battery car, 

 7, 189; monorail systems, 7, 

 191; the monorail system 

 invented by Howard Hansel 

 Tunis, 7, 193. 



Electro-chemistry, the new 

 science of, 6, 298; its use in 

 obtaining nitrogen from the 

 air, 6, 307. 



Electro-magnetism, 8, 14- 



Electron, composition of, and 

 newest theories about, 6, 148; 

 and radio-active substances, 

 6, 156; Sir J. J. Thomson's 

 conception of, 6, 158; theory 

 of origin of, 6, 165; in its re- 

 lation to the atom, 6. 156, 

 166. 



Electroplating, action of electri- 

 city in, 6, 170. 



Elevator, hydraulic, principle 

 of, described, 6, 76-77; the 

 invention of, by Elisha G. 

 Otis, 9, 169. 



Elixir of life, 2, 124, 131, 136. 



Ellis, Alexander J., gives in- 

 formation to Graham Bell as 

 to experiments on sounds 

 performed by Helmholtz, 8, 



Embalming the dead, a purely 

 religious observance in Egypt, 

 1, 50; to prevent the spirit's 

 return to torment one, 1, 54. 



Embryological development, 

 theory of, 5, 156. 



Embryology, studies in, by Von 

 Baer, Miiller, and Carpenter, 

 4, 122. 



Empedocles, one of the great 

 Italic leaders of thought, 1, 

 114; a practising physician, 

 1, 133 ; his work as a sanitary 

 engineer, 1, 134; his idea of 

 the impersonality of God, 1, 

 135; his knowledge of em- 

 balming, 1, 136; his concep- 

 tion of evolution, 1, 137; he 

 had a secure place among the 

 anticipators of the modern 

 evolutionist, 1, 138; his 

 studies of the force of air 

 pressure, 1, 247. 



Energy, The Conservation of, 

 Chapter VIII, 3, 253. 



Energy, chief sources of, at 

 man's disposal, 6, 41-42 ; man 

 learns to use energy of ani- 

 mals, 6, 59 seq.; uses of, con- 

 tained in air and water, 6, 

 62. 



Engines, see Atmospheric e., 

 Electric e., Gas e., Hot- Air e., 

 Piston e., Steam e., Water e. 



[177] 



