GENERAL INDEX 



8, 184; copper- and steel- 

 plate engravings, 8, 192; 

 etching, 8, 195; mezzotint, 

 8, 196; the invention of 

 lithography, 8, 197; intro- 

 duction of process work, 8, 

 202; discovery of photogra- 

 phy by Daguerre, 8, 202; 

 the half-tone, 8, 205; three- 

 color process of reproduction, 

 8, 21 1 ; intaglio processes, 

 8, 217; the photogravure, 

 8,217. 



ImhStep, the demi-god, con- 

 sidered to be the creator of 

 medical knowledge, 1, 49. 



Imperial Academy of Sciences at 

 St. Petersburg, 2, 202. 



Inclined plane, known to an- 

 tiquity, principle of, use in 

 pyramid-building, 6, 37; law 

 of, screw and wedge a form 

 of, 6, 38; hatchet, knife- 

 blade, and saw, forms of, 6, 



Induction, electric, discovered 



by Hauksbee, 2, 259-262. 

 Inductive versus deductive rea- 

 soning, 5, 235-238. 

 Industrial problems of to-day 



and to-morrow, 6, 316. 

 Industrial Revolution, An, 



Chapter I, 9, 5. 

 Inorganic matter, possibilities 



of, 6, 224. 

 Insane, reforms in caring for, 4, 



245- 

 Instruments of Precision in the 



Age of Newton, Chapter XIII, 



2, 252. 



Iron Age, 6, 9. 

 "Isomerism," word coined by 



Berzelius, 4, 62. 

 Italic leaders of thought, Xe- 



nophanes, Parmenides, and 



Empedocles, 1, 114. 

 Ives, F. E., perfected the process 



of color-printing, 8, 212; 



invented a slide-carrier for 



the camera, 8, 238. 



JABLOCHKOFF, M., Russian offi- 

 cer who invented a practical 

 electric light, 6, 224. 



[189] 



Jacobs, a Dutch farmer whose 

 children first found diamonds 

 in South Africa, 9, 314. 



Jackson, Dr. Charles T., claimed 

 the discovery of ether, 4, 215; 

 his interest in the possibilities 

 of electricity, 8, 19; discusses 

 the telegraph with Morse; 

 contests Morse's claim to the 

 invention of the telegraph, 8, 

 2 1 ; Sabine's summary of the 

 position of Doctor Jackson, 



8, 21. 



Jacquard, the aerial voyage of 

 the, 7, 260. 



Jacquard, Joseph Marie, inven- 

 tor of a loom for weaving 

 elaborate patterns, 9, 49; 

 early life of the inventor, 9, 

 49; his machines destroyed 

 by mobs of workmen, 9, 51. 



Jaegels, his ascent in a metal 

 balloon, 7, 264. 



Janney, Eli, automatic car- 

 coupler invented by, 7, 148; 

 technical description of this 

 coupling, 7, 149. 



Jansen, Zacharias, inventor of 

 the microscope, 2, 77. 



Jansen, photographic revolver 

 invented by, 8, 250. 



Jeffries, made a daring balloon 

 ascension with Blanchard, 7, 

 239. 



Jena, the "dream city," 6, 

 145; the streets of, 6, 146; 

 the market-place of, 6, 147; 

 its world-renowned univer- 

 sity, 5, 148. 



Jenner, his discovery of inocula- 

 tion for preventing small-pox, 

 4, 190; his famous paper on 

 vaccination, 4, 194; his first 

 inoculation, 4, 196; recep- 

 tion of the discovery in Eu- 

 rope, 4, 197. 



Jenny, architect who designed 

 the first steel-frame sky- 

 scraper in 1884, 9, 165. 



Jessop, William, substituted 

 flanged wheels for flanged 

 rails, 7, 120. 



Jet-stone, supposed to possess a 

 magical property that would 



