INDEX 



717 



Coefficient, of assortative mating, 532 ; 

 of correlation, 459-465 ; short method 

 for calculation 0^465-468; of heredity, 

 486-488; of mode, 422, 423; of re- 

 gression, 487-490 ; of variability, 433 ; 

 of variability, application of, 434 ; 

 of variability, meaning of, 434, 435 ; 

 of variability, probable error of, 441. 



Cold, acclimatization to, 313 ; effect of, 

 upon color, 264. 



Coleoptera, extra eyes in, 51. 



Color, correlation with speed in 

 trotters, 468-471 ; influenced by tem- 

 perature, 262-264; not due to pres- 

 ence of light, 242 ; when important, 31. 



Combination of characters, law of, 504- 



S 1 3- 



Combinations, formula for, 511 ; of two 

 characters, 504, 505; of three char- 

 acters, 506, 507. 



Community breeding, 674. 



Comparative value of male and female, 



587- 



Conditions of life, effect of, upon 

 development, 98-105 ; influence of, 

 upon parthenogenesis, 102, 178. 



Congenital and acquired characters, 

 354-356. 



Contact, effect of, upon direction of 

 motion, 235 ; effect of, upon func- 

 tional activity, 233-236. 



Continuity in variation, 18. 



Cope, on transmission, 354; on theory 

 of growth force, 203, 204. 



Corn, acclimatization of, 375, 377, 378 ; 

 effect of selection upon, 445, 446; 

 functional variation in, 83-86; influ- 

 ence of locality upon, 222 ; progression 

 in oil and protein content of, 493- 

 498 ; variability of, 427-431, 444, 447, 

 448 ; variability of, as affected by 

 fertility, 449-451 ; variation in com- 

 position of, 83, 84. 



Correlation, 453-471, 703-708; coeffi- 

 cients of, 455-466, 705 ; between color, 

 sex, and speed, in trotters, 468-471 ; 

 between length and circumference of 

 ear, 467; weight and length, 461; 

 definition of, 703 ; heredity a special 

 case of, 707; meaning of, 453~455 : 

 method of finding coefficient of, 460- 

 468, 707, 708 ; shorter formula for 

 calculation, 707, 708. 



Correlation table, 458. 



Cows, variation in functional activity 

 of, 92, 93 ; functional variation in, 

 77-81 ; meristic variation in mammae, 

 47; relative fertility of, 199. 



Crab, segments of, influenced by para- 

 site, i oo. 

 Crandall, observations on curculio, 



390-393- 

 Crayfish, meristic variation in oviducal 



opening, 44. 

 Cross, reciprocal, 525. 

 Crossing, 608-610 ; advantages of, 608 ; 



disadvantages of, 609. 

 Crystals, growth of, compared with 



growth of living matter, 143. 

 Curculio, egg-laying instincts of, 390- 



393- 

 Cynips, sting by, produces functional 



deviation, 98. 

 Cytoplasm, 145; in development, 177. 



Dallinger, experiments in acclimatiza- 

 tion to heat, 379-381. 



Dams, testing of, 66 1. 



Dandelion, influence of locality upon, 

 223. 



Darbishire, experiments with mice, 524. 



Darwin, experiments in cross and self 

 fertilization, 618-624. 



Davenport and Castle, experiments on 

 acclimatization, 312. 



Davenport and Neal, experiments on 

 acclimatization of stentor, 310. 



Death rate, Weismann on, 202. 



De Candolle, experiments on acclima- 

 tization, 376. 



Degeneracy contrasted with origin, 415, 

 416. 



Degeneration of useful parts, 409- 

 412. 



Determinants, 152, 208, 215. 



Determination of sex, 629-637. 



Development, 677-680; a study dis- 

 tinct from breeding, 680; confusion 

 of, with inheritance, 350 ; dependent 

 upon external conditions, 677 ; does 

 it influence transmission ? 361 ; ef- 

 fect of, upon transmission, 372, 373, 

 407-409; from a half ovum, 176; 

 how influenced, 361-363; influence 

 of food upon, 225-230; influence of 

 gravity upon, 239; influence of lo- 

 cality upon, 221-225; influence of 

 moisture upon, 230-233 ; influence 

 of use upon, 286-288; influence of, 

 upon prepotency, 574 ; limits of, 362 ; 

 mechanism of, 142-154; not an 

 index of inherited characters, 232; 

 originates in geometrical cleavage of 

 ovum, 339; requires good condi- 

 tions for well-bred individuals, 678, 

 679-) through the cytoplasm, 177. 



