774 



INDEX. 



compound statements, 143, 529 ; 



first and last catastrophe, 744 ; 



mathematical function, 7fi8. 

 Clocks, asti'oiioniical, 340, 353. 

 Clouds, 447 ; cirrous, 411. 

 Coincidences, 128 ; ft.rtuitous, 261 ; 



measurement by, 292 ; method 



of, 291. 

 Collective terms, 29, 39. 

 Collocations of matter, 740. 

 Colours, iridescent, 419 ; natural, 



618 ; 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. 

 Cjmets, 449 ; number of, 408 ; 



hyperbolic, 407 ; classification 



of, 684 ; contiict with, 746-7 ; 



Halley's comet, 537 ; Lexe.H's 



comet, 651. 

 Commutativeness, law of, 35, 72, 



Comparative use of instruments, 

 299. 



Compass, variations of, 281. 



Complementary statt^ments, 144. 



Compossible alternatives, 69. 



Compound statements, 144; events, 

 204. 



Compounds, chemical, 192. 



Comte, Auguste, on probability, 

 200, 214 ; on prevision, 536 ; li'is 

 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 ; 

 appro.ximation to natural, 465. 



Condorcet, 2 ; his ])roblem, 253. 



Confusion of elements, 237. 



Conical refraction, 653. 



Conjunction of planets, 293, 

 6 7. 



Consequent, definition of, 225. 



Conservation of emngy, 738. 



Constant numliers of nature, 328 ; 

 mathematical, 330 ; phy.sical, 

 331 ; astronomical, 332 ; terres- 

 trial, 333 ; organic, 333 ; social, 

 334. 



Continuity, law of, 615, 729 ; sense 



of, 493 ; detection of, 610 ; 



failure of, 619. 

 (3ontinunus quantity, 274, 485. 

 Contiadiction, law of, 31, 74. 

 Contrapositive, proposition, 84, 



136 ; conversion, 83. 

 Conversion of pro[tositions, 46, 118. 

 Copernican theory, 522, 625, 63.S, 



647. 

 Copula, 16. 



Cornu, velocity of light, 561. 

 Corpus'^ular theory, 520, 538, 667. 

 Correction, method of, 346. 

 Correlation, 678, 681. 

 Cotes, Roger, u.se of mean. 359 ; 



method of least squares, 377. 

 Coulomb, 272. 

 Cou]de, mechanical, 653. 

 Creation, problem of, 740. 

 Crookes' radiometer, 435. 

 Cross divisions, 144. 

 Crystal loirraphy, 648, 654, 658, 



678, 754 ; systems of, 133 ; cliis- 



sitication in, 685. 

 Crystals, 602 ; Dana's classification 



of, 711 ; p.seudoniorphic, 658. 

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



various degrees, 473. 

 Cuvier, on e.xjjeriment, 423 : on 



inferences, 682. 

 Cyanite, 609. 

 Cycloid, 633. 



Cycloidal pendulum, 461. 

 Cypher, 124. 



D'Alkmbert, blunders in proba- 

 bility, 213, 214 ; on gravit)', 463. 



Diilton, laws of, 464, 471 ; atomic 

 theory, 662. 



Darapti, 59. 



Darii, 56. 



Darwin, Charles, his works, 131 ; 

 negative results of observation, 

 413 ; argumentsagainsthistheory, 

 437 ; cultivated plants, 531 ; his 

 inliuence, 575 ; classification, 71 8 ; 

 constancy of character in classifi- 

 cation, 720-1 ; on defiiiitiuu, 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. 



D(!candolle, on classitication, 696. 



