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 

 Sassenger and freight traf- 

 c, 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, 



1 X 39- 



Greek Science of the Alexan- 

 drian or Hellenistic Period, 

 Chapter IX, 1, 189. 



Greenough, John J., 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- 



