KEY AND INDEX 



Gilbert, William, study of mag- 

 netism, 2, in; 6, 175; 7, 

 10; the earth a magnet, 2, 

 113; " dipping " of the needle, 

 2, 114; other discoveries, 2, 

 116. 



Gill, Dr. David, at the Cape 

 observatory made the first 

 photograph of a comet, 3, 67. 



Gillebrand, Professor, English 

 professor of geometry who in- 

 dependently discovered that 

 the declination of the com- 

 pass varies from time to time, 



7, 10. 



Gintl, Doctor, invents an in- 

 strument for sending tele- 

 graphic messages in opposite 

 directions at the same time, 



8, 25. 



Glaciers, the phenomena of, 3, 

 147; the moraines, 3, 148; 

 the perched bowlders, ibid.; 

 the polished and striated 

 rocks, the lapiaz, 3, 149; 

 the ancient moraines, 3, 150; 

 perched bowlders in the Al- 

 pine valley, 3, 152; Agassiz's 

 Etudes sur les Glaciers, 3, 154; 

 treated with contempt by 

 most scientists, ibid.; a mile 

 deep over New England, 3, 

 163; the results following the 

 rending of the ice sheet, 3, 

 164. 



Glands, discovery of, in the 

 mucous membrane, 4, 129. 



Glass and Glass-making, Chap- 

 ter XI, 9, 277; its origin un- 

 known, 9, 277; important 

 developments that glass has 

 made possible, 9, 278; prob- 

 able discoveries of glass, 9, 

 279; a doubtful Roman tra- 

 dition, 9, 281; the com- 

 position of glass, 9, 284; the 

 process of manufacturing 

 window glass, 9, 287; plate- 

 glass making, 9, 291; cut 

 flass, 9, 293; "wire-glass," 

 _, , 294. 



Glass negatives, invented by 

 Niepce St. Victor, 8, 229. 



Glass windows, the first, 9, 153. 



Globe, the, constructed by Ste- 

 phenson for use on the 

 Stockton & Darlington Rail- 

 way, 7, 134- 



Gloves, Manufacture of. See 

 Clothing the Extremities, 9, 

 103. 



Glycerine discovered by Karl 

 Wilhelm Scheele, 4, 27. 



Goddard, discovered that bro- 

 mine vapor rendered photo- 

 raphic plates more sensitive, 

 . 228. 



Godfrey, Thomas, discovered a 

 means of measuring the alti- 

 tude of astronomical bodies, 

 7, 20. 



Goethe, Johann Wolfgang, 

 studies of the metamorphosis 

 of plants, 4, 140-145; ex- 

 tends the doctrine to the 

 animal kingdom, 4, 146. 



Golgi, Dr. Camille, process of 

 staining nerve cells, 4, 282. 



Goodson, J. H., the graphotype 

 invented by, 8, 149. 



Goodyear, inventor of the "turn 

 shoe" machine, automatic 

 heeling-machine, etc., 9, 113. 



Gordon, Andrew, his electric 

 motor and bell, 2, 279. 



Graebe, effected the synthesis 

 of alizarine, 8, 313. 



Graham, Mr., discovered daily 

 variations of the compass, 7, 

 10. 



Gralath, Daniel, groups Leyden 

 jars in a "battery," 2, 283. 



Gramme, re-invented the ring 

 dynamo, 6. 179. 



Granville, W. P., system of 

 wireless telegraphy installed 

 by, 8, 51. 



Gravitation, Newton and the 

 Law of, Chapter XII, 2, 236. 



Gravitation, law of, discovered 

 by Isaac Newton, 2, 236; 

 Newtonian laws apply to 

 every particle of matter in the 

 universe, 3, 58; power of, 

 5, 214; hope of establishing a 

 relation between, and elec- 

 tricity or magnetism, 5, 215; 

 so-called law of, 5, 231. 



