GENERAL INDEX 



carbons for, invented by Electron, composition of, and 



Carre", 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 



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- 



AJ.AW b-llVSVO. \J*. j-Ji V^LJCli. A-llC VsCtJ. UW11 Cl V V ltl| O j J ^ O . 



filament for incandescent Elevator, hydraulic, principle 



lamp, 6, 233; the tungsten of, described, 6, 76-77; the 



lamp, 6, 234; advantages and invention of, by Elisha G. 



defects of tungsten lamp, 6, P^ SI 9 I f>9- 



235; Mercury-vapor light of Elixir of life, 2, 124, 131, 136. 



Peter Cooper Hewitt, 6, Ellis, Alexander J., gives in- 



236. formation to Graham Bell as 



to experiments on sounds 



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 



performed by Helmholtz, 8, 



75- 

 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. 



to produce a storage-battery Empedocles, one of the great 



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. 



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. 



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