774 



INDEX. 



compound statements, 143, 529 ; 

 first and last catastrophe, 744 ; 

 mathematical function, 768. 



Clocks, astronomical, 340, 353. 



Clouds, 447 ; cirrous, 411. 



Coincidences, 128 ; fortuitous, 261 ; 

 measurement by, 292 ; method 

 of, 291. 



Collective terms, 29, 39. 



Collocations of matter, 740. 



Colours, iridescent, 419 ; natural, 

 518 ; perception of, 437 ; of spec- 

 trum, 584. 



Combinations, 135, 142 ; doctrine 

 of, 173 ; of letters of alphabet, 

 174 ; calculations of, 180 ; higher 

 orders of, 194. 



Combinatorial analysis, 176. 



Comets, 449 ; number of, 408 ; 

 hyperbolic, 407 ; classification 

 of, 684; conflict with, 746-7; 

 Halley's comet, 537; Lexell's 

 comet, 651. 



Commutativeness, law of, 35, 72, 

 177. 



Comparative use of instruments, 

 299. 



Compass, variations of, 281. 



Complementary statements, 144. 



Compossible alternatives, 69. 



Compound statements, 144; events, 

 204. 



Compounds, chemical, 192. 



Comte, Auguste, on probability, 

 200, 214 ; on prevision, 536 ; his 

 positive philosophy, 752, 760, 

 768. 



Concrete number, 159. 



Conditions, of logical symbols, 32 ; 

 removal of usual, 426 ; inter- 

 ference of unsuspected, 428 ; 

 maintenance of similar, 443 ; 

 approximation to natural, 465. 



Condorcet, 2 ; his problem, 253. 



Confusion of elements, 237. 



Conical refraction, 653. 



Conjunction of planets, 293, 

 657. 



Consequent, definition of, 225. 



Conservation of energy, 738. 



Constant numbers of nature, 328 ; 

 mathematical, 330 ; physical, 

 331 ; astronomical, 332 ; terres- 

 trial, 333 ; organic, 333 ; social, 

 334. 



Continuity, law of, 615, 729 ; sense 



of, 493 ; detection of, 610 ; 



failure of, 619. 



Continuous quantity, 274, 485. 

 Contradiction, law of, 31, 74. 

 Contrapositive, proposition, 84, 



136 ; conversion, 83. 

 Conversion of propositions, 46, 118. 

 Copernican theory, 522, 625, 638, 



647. 



Copula, 16. 



Cornu, velocity of light, 561. 

 Corpuscular theory, 520, 538, 667. 

 Correction, method of, 346. 

 Correlation, 678, 681. 

 Cotes, Roger, use of mean, 359 ; 



method of least squares, 377. 

 Coulomb, 272. 

 Couple, mechanical, 653. 

 Creation, problem of, 740. 

 Crookes' radiometer, 435. 

 Cross divisions, 144. 

 Crystallography, 648, 654, 658, 



678, 754 ; systems of, 133 ; clas- 

 sification in, 685. 

 Crystals, 602 ; Dana's classification 



of, 711 ; pseudomorphic, 658. 

 Curves, use of, 392, 491, 496 ; of 



various degrees, 473. 

 Cuvier, on experiment, 423 : on 



inferences, 682. 

 Cyanite, 609. 

 Cycloid, 633. 

 Cycloidal pendulum, 461. 

 Cypher, 124. 



D'ALEMBERT, blunders in proba- 

 bility, 213, 214 ; on gravity, 463. 



Dalton, laws of, 464, 471 ; atomic 

 theory, 6C2. 



Darapti, 59. 



Darii, 56. 



Darwin, Charles, his works, 131 ; 

 negative results of observation, 

 413 ; arguments against his theory, 

 437 ; cultivated plants, 531 ; his 

 influence, 575 ; classification, 73 8 ; 

 constancy of character in classifi- 

 cation, 720-1 ; on definition, 726 ; 

 restoration of limbs, 730 ; ten- 

 dency of his theory, 762, 764. 



Davy, Sir H., on new instruments, 

 270 ; nature of heat, 343, 417 ; 

 detection of salt in electrolysis, 

 428. 



Day, sidereal, 310 ; length of, 289. 



DecandoUe, on classification, 696. 



