INDEX 



471 



Daphnid Crustacea, parthenogenesis and 



zygogenesis in, 389. 



Death: absence of, i, 260, 303; chemical 

 conceptions of, 15, 306; disintegration 

 as criterion of, in lower animals, 74; 

 from starvation, 156, 298, 302; in re- 

 lation to character of nutrition in 

 Planaria velata, 170, 174; of parts in 

 plants, 239, 241; of cells in animals, 

 257; necessity of, in higher animals, 

 270; conditions of, in higher animals, 

 301 ; physiological or natural, 301, 309; 

 various views concerning, 301, 304, 

 306, 307, 308, chap, xvi; in relation 

 to nervous system, 301, 307; from 

 exhaustion in animals, 302; appearance 

 of, in evolution, 304; in unfertilized 

 starfish egg, 307, 405; temperature 

 coefficient of, in sea-urchin larvae, 

 308, of flower in plants, 368; from old 

 age in infusoria, 382; after experi- 

 mental treatment of eggs, 409; at 

 critical stage of development, 414; 

 of larval parts, 422; as result of ex- 

 haustion of "life ferment," 436; as 

 result of differentiation, 436, 442; 

 Miihlmann's theory of, 437; in relation 

 to autocatalytic theory of growth, 448; 

 as end of senescence, 461. See also 

 Age; Age cycle; Dedifferentiation; 

 Development; Differentiation; Re- 

 juvenescence; Senescence. 



Decrement, in transmission, 209, 217, 268. 

 See also Transmission. 



Dedifferentiation: definition of, 54; 

 process of, 55; conditions of, 57; 

 course of, 58; experimental evidence 

 for, 179, 180, 294, 295; as a condition 

 of reproduction, 234; in vegetative 

 life of plants, 239; in plant cell, 245, 

 252; observational evidence for, in 

 animals, 257; limited capacity for, in 

 higher animals, 267, 286; in striated 

 muscle, 294; in nerve, 295; in ex- 

 planted kidney cells, 295; after hiber- 

 nation, 296; in embryos of starfish and 

 sea-urchin, 413; in early embryonic 

 development of animals, 418, 420; in 

 early embryonic development of plants, 

 424. See also Reconstitution; Reduc- 

 tion; Rejuvenescence. 



Dendrocoelum lacteum, susceptibility of, 

 in relation to age, 101. 



Development: reversibility of, 56, 64, 

 155, 446; progressive, 57; regressive, 

 57, 155; in relation to age cycle, 182; 

 orderly character of, 199; law of 

 antero-posterior, 204; repetition in, 220, 

 269; continuity of, 239, 247, 267, 270; 

 temperature coefficient of, 308; of 



gametes as process of specialization, 

 3 r 6, 333; stage of, in relation to 

 flowering, 373; initiation of, in rela- 

 tion to fertilization, 403; initiation of, 

 in parthenogenesis, 406; experimental 

 initiation of, 408; experimental treat- 

 ment of eggs in relation to, 409; 

 critical stages in, 413; increase in sus- 

 ceptibility during early embryonic, 

 412; different rate of, in Tautogolabrus 

 and Fundulus, 417; nucleoplasmic 

 relation in early embryonic, 418; cyto- 

 plasmic changes during early embry- 

 onic, 419; embryonic, in plants in 

 relation to age cycle, 424; Miihlmann's 

 conception of, 439; reversal of, by 

 lecithin, 454. See also Differentiation; 

 Reconstitution; Senescence. 



Differentiation: as general characteristic 

 of organisms, i; chemical conception 

 of, 17; physico-chemical conception 

 of, 23; physical analogy to, 28; defini- 

 tion of, 46; quantitative factors of, 47; 

 in relation to metabolic rate, 47, 51, 53; 

 factors of, 51; different degrees of, 

 53, 286; reversibility of, 56, 64, 155, 

 446; not primarily dependent on 

 chemical correlation, 224; quantity 

 and quality in, 226; in plants, 240, 

 242, 244, 245; in higher animals, 267, 

 286; in gametes of plants, 316, 334, 

 337, 346; in gametes of animals, 334, 

 339, 346; in relation to chemical con- 

 stitution of sperm head, 353; of 

 flower, 368, 373, 375; in early embry- 

 onic development, 420; as determin- 

 ing senescence, 442; secular, in 

 evolution, 464. See also Dedifferen- 

 tiation; Development; Gametes; Re- 

 constitution; Senescence. 



Diminution: of chromatin in A scar is 

 megalocephala, 324; dependence of, 

 on cytoplasmic environment, 327; 

 of chromatin in Miastor, 328. 



Dominance, physiological: in relation to 

 apico-basal axis, 54, 213, 215, 216; in 

 relation to metabolic rate, 216; in 

 relation to chemical correlation, 217; 

 in relation to transmission, 217, 224; 

 limit of , 217, 219, 220, 223, 268' exten- 

 sion of, during development, 219, 231, 

 232, 238, 268; spatial factor of, in posi- 

 tion of parts, 222; nature of, 225; in 

 embryonic tissue of plants, 243. See 

 also Axial gradient; Individual; Indi- 

 viduation. 



Dytiscus marginal-is, oogenesis of, 341. 



Egg. See Fertilization; Gamete forma- 

 tion; Gametes; Parthenogenic egg; 



