614 



INDEX. 



AND 



Andrews 's discovery of the^con- 

 tinuity of the liquid and gaseous 

 states, 559 



Angles, different crystalline sub- 

 stances detected by their, 598 



Anhydrous hydrofluoric acid, 502 



Animal electricity, discovery of, 

 491-492, 568 



Animal heat, discovery of a source 

 of, 539 



Animal structures discovered by 

 means of inference, 602-603 



Animal tissues, discovery of elec- 

 tricity produced by, 568, 574 



Animals, effects of galvanism on, 

 542 



discovery of constituents of, 

 539-540 



unity of plan in all, 580, 603 

 Anomalous cases, 84, 198 

 Anomalous phenomenon of mole- 

 cular change of iron, 548 



Antimony, explosive, 238-239, 522, 



550, 567 



Antiquity as a test of truth, 101 

 Antiquity of man, discovery of the 



great, 602 

 Apparatus, advantage of accurate, 



314 

 Apparent causes, 411, 412, 437 



contradiction as a sign of truth, 

 603 



truths, value of different, 190 

 Appearance often different from 



reality, 104, 111, 326, 328, 603 

 Aquapendente's discovery of valves 



in human veins, 571 

 Aqueous vapour, diathermancy of, 



544 



Arago's discoveries respecting po- 

 larised light, 510, 528-529, 537 



discovery of the influence of 

 metals on a magnet, 570 



Arfvedson's discovery of lithia, 



484, 505 

 Arrangement of an experiment, 



308-311 

 Artificial minerals, discovery of, 



506, 557-558 

 formation of, 561 



AXI 



Asellius's discovery of the lacteal 

 vessels, 571 



Ashes of rare plants and animals, 

 discovery by examining, 507 



Assistants, advantage of in re- 

 search, 273-274 



Association of ideas, 67 



Astatic needle, invention of, 485 



Asteroids, discovery of the, 231, 

 488, 509-510, 524, 577, 610 



Astrea, discovery of, 577 



Astronomical discovery, how ef- 

 fected, 575 



Atmosphere, discovery of the com- 

 position of the, 502 



Atmospheric electricity, discovery 

 of, 228 



pressure, discovery of, 226 

 discovery of the variation of, 



525-526 



temperature, discovery of its 

 relation to altitude, 566-567 



Atom, definition of, 599 

 Atoms, complex structure of, 32 

 Atomic number, relation of to 

 magnetic capacity, 583 



theory of chemistry, 502, 508, 

 580 



weights, Prout's theory of, 599 

 Stas's discoveries respecting, 



599 

 Attention, 60-62, 319 



value of in research, 61, 247 

 Attraction of the earth, Bessel's 



experiments on the, 526-527,558 



of various electrified bodies, 

 discovery of the, 531-533 



and repulsion of various mag- 

 netised bodies, mathematical 

 expressions for, 606 



Aurora, effect of on a magnet, 



570 



Authority, value of, 101 

 Automatic fire, discovery of, 551 

 Averages, discovery by the method 



of, 434-435 

 Avogadro's hypothesis, 180, 599- 



600 



Axinite, pyro-electricity of, 535 

 Axioms, ancient, 19 



