630 



INDEX. 



IMA 



Imaginative power, scientific, 365 



the nature of, 361 



Immediate causes, 411, 414 

 ideas, 51 



inference, 347-348 

 Immensity of space, 31 



of number of existing bodies, 

 30 



of time and space in astro- 

 nomical phenomena, 30 



Important phenomena, not the 

 most violent or sudden, 559 



Incompatible causes, value of a 

 knowledge of in research, 417 



Incompleteness of the properties 

 of bodies, usual, 393 



Inconceivability considered as a 

 test of truth, 19 



Indestructibility of cerebral im- 

 pressions, 65 



India-rubber, discovery of, 564 



Induced electric currents, Dove's 

 discoveries respecting, 493 



Induction and deduction, 346 



Inductive and deductive action of 

 causes, 415 



modes of discovery, 460- 



461, 524-525, 583-584 



Industry as a means of success in 

 research, 241, 255 



Inference, basis of, 344, 448 



immediate, 347-348 



value of mediate, 355 



kind of knowledge derived by 

 the aid of, 342 



- mediate, 347, 349, 353, 354 



method of discovering truth by 

 means of, 583-584 



- necessary conditions of, 332- 

 333, 585 



process of, 333, 336-342, 345 



quantitative, 359 



scientific, illustrations of, 335 



the basis of prediction, 344, 

 401 



use of in devising hypotheses, 

 358-359 



Infinite Cause, the idea of an, 49 

 Innate mathematical genius, in- 

 stances of, 40-41 



IOD 



Innate scientific genius, instances 

 of, 245 



Instances, conspicuous, exception- 

 al, residuary, 85 



exceptional, extreme, conspi- 

 cuous, 498-501 



of discoveries missed, 214, 595 

 of residual phenomena, 433 



of false discoveries, 135-137 



of re-discovery, 529, 535, 591- 

 592 



of mathematical genius, 40-41 



of scientific genius, 245 



of simultaneous discovery, 172 



of suqcessful prediction, 227- 

 233 



Instinct, considered as a test of 



truth, 101 

 Instruments, necessity of accurate, 



392 



discovery by means of new, 

 471 



of great power, discovery by 

 means of, 560 



< Integrating machine ' of Professor 

 J. Thomson, 607 



Intellectual processes, illustra- 

 tions of, 333-342 



' Intension ' of meaning of terms, 

 52, 78 



Interference of light, discovery of 

 the, 490-491, 528 



International encouragement of 

 research, influence of, 287 



Intrinsic value of different scien- 

 tific truths, 190 



Invention, a condition of dis- 

 covery, 471 



and discovery, difference be- 

 tween, 3 



scientific, 363 



Inventive power, necessity of to 



success in research, 241, 306-308 

 Investigation, how to commence 



an, 455, 465 

 Investigations, suggestions of new, 



468-470, 513-514, 605 

 Investigators, ability of women as 



scientific, 282 

 Iodine, discovery of, 506 



