640 



INDEX. 



RAD 



Kadiating and absorbing power of 



gases for light, 578-579 

 Rainbow, discovery of the frue 



explanation of the, 589 

 Kapidity of flow of ideas, 54-55 



of nerve-current, 56 

 Karefied gases, electric spectra in, 



536 



discovery of the electric con- 

 duction resistance of, 555 



Eare substances, discovery by ex- 

 amining, 504-505 



Beading, advantage of to a scien- 

 tific investigator, 294-295,297 



Eeal causes, how detected, 429 



Kealities often different from ap- 

 pearances, 104, 111, 326, 328, 603 



Keason, definition of, 332 



Reasoning, basis of, 344 



conditions of, 332, 343 



faculty, feebleness of our, 343 



illustration of the process of, 

 333-336 



power, necessity of to success 

 in research, 241, 251-252 



process, definition of, 332 



the process of, 333, 336-342, 

 345 



Recollection of ideas, 71 



Recognition of ideas, memory, 63- 

 64 



Recreation, necessity of to dis- 

 coverers, 259 



Re-discovery, instances of, 299- 

 301, 529, 535, 552, 578, 591-592 



Refinement of methods, as a 

 source of discovery, 213 



Refraction of light, discovery of 

 double, 565-566 



Refractory substances, fusion of, 

 561 



Refrangibility of light, discovery 

 of the change of, 491 



discovery of the unequal, 



478, 517-518, 527 



Regnault and others' discovery 

 that liquids are slightly com- 

 pressible, 559 



' Relational machine ' of Mr. Smee, 

 54 



RES 



Relations of phenomena to each 



other, 427-429 

 Relative importance of different 



discoveries and phenomena, 191, 



559 



- value of different scientific 

 truths, 190 



Relativity, doctrine of, 36-37 



Religious opinions of investiga- 

 tors, influence of upon their 

 powers of research, 261 



Remarkable instance of error, 109 



Repetition of experiments, dis- 

 covery by means of, 543 



Representative ideas, 42 



Repulsion by a magnet, discovery 

 of, 570 



Research, advantage of employing 

 assistants in, 273-274 



aided by invention, 471 



conditions of successful, 462- 

 464 



defects of an incomplete, 397 



- difficulties of scientific, 11, 

 209-219 



endless nature of scientific, 7, 

 22, 27, 394, 469, 563 



great value of exhaustive, 199 



how to commence a, 455, 465 



- how to conduct an original, 

 377-381, 383, 385, 389, 391 



influence of age upon the power 

 of scientific, 275-278 



of controversy on scientific, 



303 

 of marriage on the power of 



scientific, 278-282 

 - of scientific societies on, 



284-287 

 of scientific teaching on the 



power of, 271 

 of scientific writing on the 



power of, 271 

 of wealth on the power of, 



273 



partnership method of scien- 

 tific, 275 



scientific, pleasures of, 11 

 promotion of by cosmo- 

 politan union, 288 



