GENERAL INDEX 



Gray, Asa, became an ardent 

 propagandist, 4, 175. 



Gray, Prof. Elisha, his experi- 

 ments with submarine signal- 

 ing, 7, 85; invents a system 

 for sending multiple messages, 

 8, 26; inventor of a practical 

 telephone, 8. 73; controversy 

 with Bell, 8, 81. 



Gray, Stephen, experiments 

 with electric conduction and 

 insulation, 2, 262; 6, 219; 

 modern telegraph made pos- 

 sible by his discovery that 

 electricity could be conduct- 

 ed practically unlimited dis- 

 tances by means of wires or 

 threads, 8, 4. 



Gray, Thomas, suggest the con- 

 struction of a railroad for 

 passenger and freight traf- 

 fic, 7, 127. 



Great Eastern, description of 

 the, 7, 77; the part it played 

 in the laying of the Atlantic 

 cable, 8, 42. 



Great Republic, description of 

 the, 7, 61. 



Great Western, made a record 

 voyage, for the first time 

 using steam alone as a motive 

 power, 7, 73. 



Greek Philosophers in Italy, 

 The Early, Chapter VI, 1, 



112. 



Greek Science, The Beginnings 

 of, Chapter V, 1, 103. 



Greek Science in the Early 

 Attic Period, Chapter VII, 



If J 39- 



Greek Science of the Alexan- 

 drian or Hellenistic Period, 

 Chapter IX, 1, 189. 



Greenough, John T., inventor 

 of a sewing-machine using a 

 double-pointed needle, 9, 91. 



Guericke, Otto von. See von 

 Guericke. 



Gu6rin, Alphonse, endeavors to 

 protect wounds from germs, 

 4, 230. 



Guimet, French chemist who 

 synthesized the pigment ul- 

 tra-marine in 1828, 8, 297. 



Gulf Stream, the, theories of 

 Humboldt and Maury con- 

 cerning it, 3, 196; it carries 

 an enormous quantity of heat, 

 3, 197; its effect on the 

 climate of the seaboard of the 

 United States and Europe, 3, 

 '198. 



Gun-shot wounds, effect on sur- 

 gery in the sixteenth cen- 

 tury, 2, 41. 



Gurney, opposition to the auto- 

 mobile invented by, 7, 160. 



Gutenberg, Johannes, the father 

 of printing, 8, 120; his press 

 the simplest and first, 8, 120. 



Guy of Chauliac, the effect of 

 his methods upon mediaeval 

 surgery, 2, 38. 



Gyrocar, The, Chapter VII, 7, 

 195; gyroscopic action ex- 

 plained, 7, 197; Mr. Bren- 

 nan's model car, 7, 200; How 

 the Brennan gyroscopes 

 work, 7, 203; the evolution 

 of an idea, 7. 213. 



Gyroscope and Ocean Travel, 

 The, Chapter VIII, 7, 217; 

 the idea of the gyroscope on 

 ships put into fairly success- 

 ful operation by Professor 

 Piazzi Smyth, 7, 217; Bes- 

 semer 's costly experiment, 7, 

 217; Dr. Schlick's successful 

 experiment, 7, 219; did gy- 

 roscopic action wreck the 

 Viper? 7, 222; theoretical 

 dangers of the gyroscope, 7, 

 223. 



Gyroscopic action explained, 7, 

 197. 



HADEN, Seymour, one of the 

 great exponents of the type 

 of engraving known as etch- 

 ing, 8, 196. 



Hadley, John, devised an in- 

 strument called the qua- 

 drant for measuring the al- 

 titude of astronomical bodies, 

 7, 20. 



Haeckel, Ernst Heinrich, 

 and the Darwinian theory, 4, 

 175; and the disputed ques- 



[183] 



