INDEX. 



631 



IRI 



Iridium and osmium, discovery 



of, 505-506 

 Iron, discovery of the passivity of, 



535 , 



Iron wire, molecular changes in. 



33, 519, 548 

 Isochronism, extensive action of 



the principle of, 520 

 Isomorphism, discovery of, 601 

 Isothermal lines, discovery of, 571 



TACOBI'S invention of his rheo- 



J stat, 486 



Jenner's discovery of the process 



of vaccination, 495 

 Jevons's definition of scientific 



genius, 252 



' logical machine,' 607 

 Joule's discoveries, 388, 531, 591 

 Juno, discovery of the planet, 



509-510 



Jupiter, discoveries respecting the 

 planet, 475, 573, 587, 609 



discovery of the moons of, 475, 

 573 



Encke's discovery respecting, 

 609 



KEIR'S discovery of the pas- 

 sivity of iron, 535 

 Kepler and Newton, contrast be- 

 tween, 251 



as a discoverer, 249-251 

 Kepler's hypotheses, 249 



pecuniary difficulties, 265 



pleasure in making a discovery, 

 10 



Kinds of discoveries made by dif- 

 ferent methods, 456, 464 



of effect, conditions of different, 

 440 



Kircher's invention of the magic- 

 lantern, 527 



Kirchoff and Bunsen's discoveries, 

 179, 559-560, 578-579, 591 



Kleist's invention of the Leyden 

 jar, 480 



observation of muscular con- 

 traction by electricity, 492 



LAW 



Knowledge, scientific, a condition 

 of moral conduct, 133, 521 



fallibility of scientific, 147 



- fundamental importance of 

 qualitative, 202-204 



- incompleteness and inexacti- 

 tude of scientific, 17 



necessary to success in research, 

 4,241 



trustworthiness of scientific, 

 149 



Kreil's discovery of an influence 

 of the moon on terrestrial mag- 

 netism, 578 



7 ABOUR and cost of discoveries, 



lJ 8, 220-222, 264, 257, 255- 

 256, 226, 236 



Lacteal vessels, discovery of the, 

 571 



of the functions of the,571 



Lagrange's discoveries, 543, 608- 

 609, 610 



Lamarck's inference of gradual 

 evolution of animal species, 602 



Laminse, discovery of the thick- 

 ness of thin, 589 



Language, danger of inaccurate 

 scientific, 77 



Laplace's discovery respecting the 

 velocity of sound, 491 



Latent heat, discovery of, 529- 

 530, 591 



' Laughing gas,' discovery of some 

 of the effects of breathing, 542 



Lavoisier's discoveries, 475, 502, 

 511-512, 541, 553 



Law of action of gravity, dis- 

 covery of, 173, 177, 224, 388, 

 509, 573, 585-586 



of Boyle and Mariotte, dis- 

 covery of the, 550-551 



of continuity, use of in re- 

 search, 611-612 



of contradiction, the, 343 



of descent of falling bodies, 

 discovery of, 487-488 



of discovery by means of ex- 

 periment, 458 



