INDEX. 



627 



GAS 



Gassiot's discovery of the sponta- 

 neous completion of the voltaic 

 circuit, 561 



Gauss's discovery of his theory of 

 terrestrial magnetism, 594-595 



invention of his magnetometer, 

 486 



Gay-Lussac's discovery of com- 

 bining volumes of gases, 180, 

 599 



Geber's discovery of a solvent for 

 gold, 556 



General causes, 413 



ideas, how formed, 400-401 



rules of research, 462 



terms, 80-82 



.truths, how discovered, 581, 



583 

 importance of discovering, 



193 

 Generalisation, basis of, 325 



danger of too extensive, 402, 

 448 



discovery by means of, 580-581 



nature and use of, 400-403 

 Generalised facts, 84 



Genius, circumstances favourable 

 to the development of, 266 



definitions of, 242-243, 252 

 instances of innate scientific, 

 245-246 



mathematical, 40-41 



necessity of to success in re- 

 search, 241 



scientific, conditions of, 361- 

 362 



Geoffrey's (and others) inference 

 of the existence of chemical 

 affinity, 597 



Geographical discoveries, how 

 made, 468, 571 



Geological changes, discovery of 

 the gradual nature of, 601-602 



Gerboin's discovery of electrolytic 

 movements of mercury, 547 



Gilbert's discoveries respecting 

 electric attraction, etc., 531, 

 545 



Glacial phenomena, how disco- 

 vered, 571 



GUN 



Glass, discovery of electric action 

 through, 532 



Glauber's rule of discovery, 501 



Glucina, discovery of, 504 



Goethe's suggested discovery re- 

 spect ing plants, 579-580 



Gold, discovery of a solvent for, 

 556 



Golding Bird's electro-deposition 

 of potassium and sodium, 485 



Gold points, invention of, guarded, 

 481 



Goniometer, invention of the, 478 



Government grant for assisting 

 researches in science, 223 



Gradation, use of the method of, 

 in research, 613 



Graebe's discovery of artificial ali- 

 zarine, 600 



Graham's discovery of diurnal 

 magnetic variation, 577 



invention for detecting changes 

 of magnetic intensity, 537 



Gravitative attraction of a moun- 

 tain, discovery of the, 586 



Gravity, discovery of its variation 

 with altitude, 586 



of the law of action of, 173, 



177, 224, 388, 509, 573, 585- 

 686 



feebleness of the force of, 24 



velocity of the force of, 31 

 Gray's discoveries respecting fric- 



tional electricity, 532-533 

 Gray and Wheler's discoveries re- 

 specting static electricity, 553- 

 554 

 Great discoveries, prelumined, 178 



Cause of all things, 48-50, 403- 

 404 



Grew's discoveries, 476 



Grimaldi's discovery of diffraction 

 of light, 565 



Grotthus's invention of his theory 

 of electrolysis, 593 



Grove's battery, invention of, 485 



Guericke, Otto, invention of the 

 electric machine by, 480 



Gunpowder, discovery of the pro- 

 perties of, 551 



s s 2 



