626 



INDEX. 



FAR 



Faraday and others' discovery that 

 gases and vapours are the. pro- 

 ducts of volatile liquids, 559 



Female discoverers, rarity of, 

 283 



Films, discovery of the thickness 

 of thin, 547 



' Fire air,' discovery of, 539 



First cause, the idea of a, 50 



Fisher's discovery of the effects of 

 magnetism on the rates of chro- 

 nometers, 577-578 



FizeaTi's determination of the ve- 

 locity of light, 548 



Fluids in stones, discovery of, 

 571-572 



Fluorine, theory of the existence 

 of, 513 



Forbes's discovery of polarisation 

 of heat rays, 485-486 



Forces, convertibility and equiva- 

 lency of, 417 



correlation of, 163 -164 



discovery by examining the 

 effects of, 551 



Forces, limited number of, 15 



properties of the physical, 159- 

 165 



Foreign discoverers, encourage- 

 ment received by, 265 



Formula of the quantity of the 

 voltaic current, discovery of 

 the, 593 



Fourcroy, Vauquelin, andSeguin's 

 discoveries, 541, 544 



Fourier's inference of the tem- 

 perature of space, 591 



Fowler's discovery of some of the 

 effects of galvanism on animals, 

 542 



Fox-Talbot's discovery with re- 

 gard to spectrum analysis, 590 



Franklin's discoveries, 228, 534, 

 567, 592 



invention of the electric kite, 

 480 



Fraunhofer's discoveries, 527-528, 

 574 



lines, discovery of the true ex- 

 planation of, 578-579, 591 



GAS 



Freedom of the human will, 130- 

 131 



Fremy on remuneration for scien- 

 tific research, 217-218 



Fresnel's discoveries, 228, 510, 528 



Friction of ice, discovery of heat 

 evolved by, 530 



Eumford's experiments respect- 

 ing heat evolved by, 530 



Frictional electricity, discovery 

 of, 491 



discoveries respecting, 531- 



533, 553-554 



Fuchs's inference of the isomor- 

 phism of substances, 601 



' Fundamental laws of discovery,' 

 458, 576 



< of thought,' 343 



Fusion of refractory substances 

 by the voltaic current, 561 



in the ' voltaic arc,' 



discovery of the, 56 



Future discovery, its probable ex- 

 tent, 28 



/GALILEO'S discoveries and in- 

 \J ventions, 172-175, 390, 475, 



479, 487, 545, 573 

 Galileo, persecution of, 269 

 Gallibrand's discovery that mag- 

 netic variation is not uniform, 



570 

 Galton's proposed measurement 



of ideas, 55 

 Galvanic electricity, discovery of 



some of its effects on animals, 



542 



Galvani's discovery, 171, 568 

 Galvanometer, invention of, 485 

 Gases and vapours are products of 



volatile liquids, discovery that, 



59 



discovery of some of the effects 

 of breathing various, 542 



their transparency to heat, dis- 

 covery of, 479 



Gassendi's discoveries respecting 

 sound and magnetism, 474-475, 

 570 



