GENERAL INDEX 



facturing industry, 6. 214; Gastric juice, Reaumur's ex- 

 cost of production of, 6, 215; periments with, 4, 89; Spat- 

 defects of, 6, 215; lamps for 

 burning, 6, 216; at the Pan- 

 American Exhibition 



at 



Buffalo, 6, 216; proper meth- 

 od of generating, 6, 217. 



Gas and Oil Engines, Chapter 

 on, 6, 132. 



Gas engine, principle of, 6, 132; 

 of Sir G. Cayley, 6, 132 ; early 

 attempts to invent, 6, 134; 

 first practical one invented 

 by J. J. E. Lenoir, 6, 135; 

 principle on which modern 

 gas engines work, 6, 135; 

 method of operation in per- 



lanzani's and Hunter's the- 

 ories of, ibid.; action of, after 

 death, 4, 90; hydrochloric 

 acid discovered in, 4, 129; 

 pepsin, active principle in, 

 ibid. 



Gaudin, produced true rubies of 

 microscopic size, 9, 331- 



Gauss, one of the first inventors 

 of a practical working tele- 

 graph, 8, 17. 



Gay-Lussac, Joseph Louis, ex- 

 periments with gases, 4, 42. 



Gears, levers of the second class, 

 6, 35-36, 



fected type, 6, 138; intro- Geber, Arabian chemist, 2, 20. 



duction of a volatile oil for Gems, Natural and Artificial, 



supplying the gas, 6, 139; Chapter XII, 9, 295; "lucky" 



G. Daimler's development m and "unlucky" 



1884, 6, 140; modern form 

 of motor devised by Messrs. 

 Panhard and Levassor, 6, 

 140; difficulties to be over- 

 come in perfecting it precisely 

 opposite to those of the steam 

 engine, 6, 140; status of, as 

 compared with steam en- 

 gines, 6, 141; reason for ex- 

 ploding the mixed gases in 

 the oil engine, 6, 



stones, 



295; confused nomenclature, 

 9, 297; practical tests, 9, 

 300; the cutting of precious 

 stones, 9, 305; diamonds in 

 the rough, 9, 312; the ruby 

 and its allies, 9, 319; artificial 

 gems, 9, 327. 



Genealogical tree, Haeckel's, 

 regarding the ancestry of 

 man, 5, 172; the "missing 

 link," 6, 173- 



l/H\_- Wll ^lJ.t^lJ.H_- j \J j J.f.|. J.J.IJL.TV, Vj A / J * 



Gas, illuminating, flat burner Gennes, M. de, French Naval 



invented by Neilson in 1820, 

 6, 208; invention of the incan- 

 descent mantle, 6, 208; Cla- 

 mond mantle used in 1882, 

 6, 209; used for producing 

 "lime light," 6, 209; Dr. 

 Auer von Welsbach's per- 

 fected incandescent burner, 

 6, 210; acetylene used for, 

 6, 212; part played by elec- 

 tric furnace in producing 

 acetylene gas, 6, 213. 

 Gases, liquefied, 5, 40-42 ; meth- 

 ods used, 5, 45, 46; Dewar's 



officer who suggested plans for 

 a power-loom, 9, 43. 



Geocentric theory, 1, 217. 



Geology, The Origin and De- 

 velopment of Modern, Chap- 

 ter IV, 3, 116. 



Geometry, according to Herod- 

 otus, was invented in Egypt, 

 1, 107. 



Gerard, the flying-machine of, 

 7. 241. 



Gerlach, the histological scheme 

 of, 4, 281. 



Germanium discovered, 4, 68. 



vacuum vessel for holding, 5, Giant, the voyages of the, 7, 252. 



53; new, discovered by Dr. Giffard, "the Fulton of aerial 



Ramsey, 6, 84; questions navigation," 7, 251. 



raised by discovery, 6, 89-91; Gifford, George, a New York 



lawyer, his argument for the 

 validity of Howe's sewing- 

 machine patent, 9, 93. 



their relation to the con- 

 duction of electricity, 6, 93. 

 Gas mantle, 6, 211. 



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