632 



INDEX. 



LAW 



Law of discovery by means of the 

 senses and intellect, 458, 5*6 



of duality, the, 343 



of identity, the, 343 



of magnetic attraction, Mayer's 

 inference respecting the, 592 



of nature, no exceptions to a, 

 196 



universality of, 121, 123, 404 

 Laws, limits of the number of, 16 



of causation, 405 



discovery, 458, 576 



double stars, discovery of 



the, 516-517 



electric distribution, dis- 

 covery of the, 481 



of electro-magnetism, disco- 

 very of, 537 



of nature, a basis of the rules 

 of morality, 521 



of thought, 343 



Learned societies, influence of on 



research, 285 

 Least-squares, discovery by the 



method of, 611 

 Lecturing, influence of scientific, 



upon the power of research, 271 

 Leeuwenhoeck's discovery of ani- 



malculse, 476 

 Leyden jar experiment, 234, 480 



Franklin's discovery re- 

 specting the, 567 



Libration of the moon, discovery 

 of the cause of, 608-609 



Light, discoveries respecting po- 

 larised, 489-490, 510, 528-529, 

 566 



of dark chemical rays in 



solar, 573 



of the composition of white, 



546 



of the diffraction of, 565 



of double refraction of, 565- 



566 



of the interference of, 490- 



491, 528 



discovery of the undulatory 

 theory of, 590 



- unequal refrangibility 

 of, 478, 517-518, 527 



LON 



Light, discovery of velocity of, 

 548,587-589 



effects of absorption of, 32 



number of vibrations of 

 coloured, 32 



Lightning conductor applied to 

 ships, 537 



discovery of the identity of 

 electricity and, 534, 592 



produces magnetism, discovery 

 that, 570 



rod, invention of the, 480 

 Lime, discovery of the non-chemi- 

 cal action of hydrochloric acid 

 on, 550 



Limitations of our powers, 102- 

 104, 169-170, 211 



Limiting and regulating condi- 

 tions of phenomena, 441 



conditions, how discovered, 

 443, 444 



Limits of discovery, 15-18, 462, 

 463 



of science, 2, 15-18 



to experiments, 213 

 Linnseus's arrangement of crystals, 



601 



Liquefaction of various gases, 

 discovery of the, 531, 551, 560 



Liquefied gases, discoveries with, 

 543-544, 550 



Liquids, discovery of the com- 

 pressibility of, 559 



discovery of the effect of mag- 

 netism on the flow of, 567 



Lithia, discovery of, 484, 505 

 Litmus, extract of, discovery of 

 its use as a test for acids, 539 



paper, discovery of the effects 

 of voltaic electricity on, 554,568 



solution, electrolysis of, 483 

 Lives of eminent discoverers, books 



on the, 262 

 Livingstone's discoveries, 233 



great power of attention, 61 

 ' Logical machine,' 607 



Logic, value of, in scientific dis- 

 covery, 355-358 



Longitude, invention for deter- 

 mining by electric telegraph, 53 7 



