616 



INDEX. 



BOI 



Boisgeraud's invention of mea- 

 surement of electric-conducfrion- 



resistance, 537 

 Bonnet's physiological discoveries, 



541-542 

 Boracite, electric properties of, 



535 

 Bottot's discovery of electrolysis 



by means of thermo-electricity, 



537 

 Bougier's discovery of the gravi- 



tative attraction of a mountain, 



586 

 Bouilliaud's prediction of the law 



of action of gravity, 176 

 Boyle's discoveries, 526, 529, 531- 



532, 539, 556 



and Mariotte, discovery of the 

 law of, 550-551 



Boze's discovery that electricity 

 has no weight, 533 



Bradley's astronomical discove- 

 ries, 236-238 



Brandt's discovery of phosphorus, 

 552 



Brard's discovery of the pyro- 

 electricity of axinite, 535 



Brewster's discoveries, 510, 551, 

 571-572, 578, 581-582, 590 



Bromine, discovery of, 506 



Brugmans's and Le Bailli's dis- 

 covery of magnetic repulsion, 

 494, 570 



Bruno, persecution of, 269 



Buff's discovery respecting the 

 diathermancy of aqueous va- 

 pour, 544 



Bunsen's discovery of caesium and 

 rubidium, 507 



and Kirchoff's discoveries, 179, 

 559-560, 578-579, 591 



/CABLES, electric induction in, 



U 235, 496 



Cadmium, discovery of, 496-498 



Caesar's discovery of magnetisa- 

 tion of iron by position alone, 

 570 



Cgesium, discovery of, 507 



CAU 



Cagniard de la Tour's experi- 

 ments, 231, 475 



Cailletet's discovery of the lique- 

 faction of nitrous oxide, etc., 

 560 



Calcium, phosphide of, 518 



Camera-obscura, discovery of the 

 principle of the, 527 



Canton's discoveries in magnetism 

 and electricity, 534-535, 577 



Carbon, discovery of the elemen- 

 tary nature of, 502 



Carbonate of calcium, its nume- 

 rous crystalline forms, 34 



Carbonic acid, discovery of, 540- 

 541, 553 



electric conduction resist- 

 ance of, 543, 544 



Lavoisier's examination of, 



502 



Black's experiments respect- 

 ing, 513 



solidification of, 531, 559 



Carlisle and Nicholson's discovery 

 of free voltaic electricity, 481 



Carrington and Hodgson's dis- 

 covery of a solar outburst, 578 



Causation, 112-113, 160 



meaning, conditions, and signs 

 of, 404-406 



universal, 160 



Cause of all things, 49-50, 403- 

 404, 409-410 



definition of a, 406, 407 



testing a supposed, 427 



and effect, relation of, 427- 

 429 



Causes, dynamic, 407, 417 



number of, 408 



classification of, 408-409 



chains of, 406, 414, 430-431 



ultimate, real, apparent, essen- 

 tial, releasing, exciting, 409- 



410, 411, 412, 413 



immediate, active, potential, 

 general, primary, secondary, 



411, 413, 414 



complex, concurrent, opposed, 

 convertible, equivalent, occult, 

 414,416,417,418,431 



