642 



INDEX. 



SAL 



Salt, discovery of the widely dif- 

 fused presence of common, 574 

 Saturn's ring, discovery of, 573 

 Savart's experiments on vibra- 

 tions and sounds, 475, 527 

 Savary's discoveries in electro- 

 magnetism, 539 



Schwabe's discovery of the perio- 

 dicity of the solar spots, 566- 

 577 



Schweigger's invention of an im- 

 proved galvanometer, 485 

 Scheele and Bergmann, 274 

 Scheele's discoveries, 501-502, 540, 



544, 552-553, 556-557 

 Schiaparelli's discovery respecting 

 the August meteorites, 587, 609- 

 610 



Science, definition of, 2, 

 Scientific accuracy, 148-149 

 Scientific beliefs, sources of, 91 



certainty, different degrees of, 

 143 



character of Euler, 252 ; Fara- 

 day, 242, 257 ; Harvey, 255 ; Sir 

 W. Herschel, 252 ; Hunter, 255 ; 

 Newton, 61, 244, 246-248 



discoverers, persecution of, 269 



discovery, promotion of by all 

 men, 12 



mistaken notions respecting, 



3, 222, 223 



facts, classes of, 85 

 252 



ignorant hostility to, 267 



hypotheses, value of, 367 



ideas, 45 



sources of, 42, 51 



ultimate, 49, 409 



imaginative power, 365 



inference, illustrations of, 335 



insight, 330, 340, 447 



conditions of, 294, 361-362 



how cultivated, 330 



knowledge, calming influence 

 of, 142 



certainty and trustworthi- 

 ness of, 141-147, 149 



not infallible, 147 



not intuitive, 19 



SEN 



Scientific occupations, influence of 

 on the power of research, 271 



proof, methods of, 352-353 



reasoning, the process of, 333 



research as a regulator of mo- 

 rality, 5, 521 



deficiency of at our old Uni- 

 versities, 284 

 difficulties of, 11, 209-219 



researches, rarely entirely en- 

 tirely novel, 544 



societies, influence of upon re- 

 search, 284-287 



study, the evil effects of exces- 

 sive, 259 



terms, classes of, 79 



truth, self-consistency of, 153, 

 155 



Scoresby's geographical discove- 

 ries, how made, 571 



Screens, influence of upon electro- 

 magnetism, 539 



Searching for something new, and 

 being sure to find it, 238, 549 



for impossible things, 17 



for one thing, and finding 

 another, 236-238, 515-519 



* Secondary pile,' invention of the, 

 484 



Seebeck's discovery of thermo- 

 electricity, 537, 553, 594 



discoveries respecting polarised 

 light, 478, 510 



Seguin and Mayer's hypothesis of 



the mechanical equivalent of 



heat, 591 

 Selecting a subject of research, 



difficulties in, 375 

 Selection of ideas and beliefs, 62, 



98, 157 

 Selective power of crystals, 34-35 



cf living tissues, 35 



Selenium, discovery of, 506, 518, 



566 



Sensation, investigation of, 56-50 

 Senses by which we observe, the 



318-319 



errors of the, 114-115 



kind of knowledge derived 

 from our, 312 



