INDEX 



473 



Germ path: absence of, in plants, 316; 

 in Ascaris megalocephala, 324; deter- 

 mined by cytoplasmic conditions, 327, 

 328, 329; in Cyclops, 327; in Sagitta, 

 327; in Chironomus, 328; in Miastor, 

 328; in chrysomelid beetles, 328; 

 in hymenoptera, 329; in vertebrates, 

 329; absence of, in certain animals, 

 331. See also Gamete formation, 

 Gametes. 



Germ plasm, 2, 3, 55, 64, 179, 315, 322, 

 330. 332, 346, 356, 397, 461; supple- 

 mentary, 315, 333; no segregation of, 

 in plants, 316; question of continuity 

 of, in plants, 323; supposed segregation 

 of, in animals, 323; not an independent 

 entity in Ascaris megalocephala, 327; 

 definition of, 462. See also Gametes; 

 Germ path; Reproduction, gametic. 



Gliadin, in nutrition experiments, 278. 



Gonophore of hydroids, dedifferentiation 

 of, 258. 



Growing tip: in Planaria dorotocephala, 

 124; in plants, 204, 216, 221, 229, 232, 

 238, 240, 244, 246; inhibition of, 221, 

 231. 



Growth: as general characteristic of 

 organisms, i; chemical conception of, 

 16, 38; in organism and in crystal, 16; 

 definitions of, 34, 37; changes in water 

 content during, 36; reversibility of, 

 38; different processes of, 38; proteid 

 synthesis in, 39; in relation to rate of 

 oxidation, 43, 279; rate of, in relation 

 to age, 86, 96, 240, 273, 282; of new 

 tissue in reconstitution of Planaria 

 dorotocephala, 103; axial gradients in 

 rate of, 204; beyond limit of individual 

 size, 220, 229, 231; in relation to 

 agamic reproduction in plants, 239; 

 limitation of, by differentiation in 

 higher animals, 223, 230, 268; correct 

 measure of rate of, 273; periodic, 276, 

 388; difference between, and mainte- 

 nance, 278; during partial starvation in 

 mammals, 280; senescence in mammals 

 without, 282; after starvation in birds 

 and mammals, 298; after starvation 

 in amphibia, 300; energy requirement 

 for, in mammals, 305; rate of, in 

 gametes, 349; in relation to gamete 

 formation in algae and fungi, 364; 

 limitation of, in flower, 368; cessation 

 of, at flowering, 369; in relation to 

 surface and volume, 438; as an auto- 

 catalytic reaction, 446, 452; founda- 

 tion of autocatalytic theory of, 448; 

 significance of absolute and relative 

 increments of, 449; inadequacy of 

 autocatalytic theory of, 452, 455; 



lecithin as autocatalyst of, 453. See 

 also Reduction. 

 Growth impulse: assumption of, un- 

 necessary, 45 ; supposed location of, 

 in mammals, 280; senescence as inhi- 

 bition of, 434. 



Headless form in Planaria dorotocephala, 

 112. 



Heat production : in relation to body sur- 

 face, 272; during early embryonic 

 development of sea-urchin, 412. 



Heredity: in relation to germ plasm, 462; 

 definition of, 462. 



Heterotypic mitosis: in maturation, 334; 

 occurrence and experimental produc- 

 tion of, in other cells, 334. 



Histone, in sperm head, 353. 



Hordein, in nutrition experiments, 

 278. 



Hormones, 224. See also Correlation. 



Hydra: susceptibility of, in relation to 

 age, loi; rejuvenescence of, in recon- 

 stitution, no; budding in, 145; reju- 

 venescence of, in agamic reproduction, 

 145; oogenesis of, 340; conditions of 

 gamete formation in 383. 



Hydroides dianihus: susceptibility of 

 eggs of, after fertilization, 406; rejuve- 

 nescence during early development of, 

 4IS- 



Increment: absolute and relative, in 

 growth, 273, 449; decrease in relative, 

 of growth during senescence, 274. 



Individual, organic: nature of, S4, 225; 

 agamic formation of, in Planaria doro- 

 tocephala, 122; definitions of, 199, 225; 

 characteristics of, 199; radiate type of, 

 200; axiate type of, 200, 225; inade- 

 quacy of current theories of, 201; 

 axial gradients in, 202; dominance 

 and subordination in, 210; limit of 

 dominance and size of, 217; other 

 factors limiting size of, 223, 230, 268; 

 in the plant body, 237. See also 

 Dominance; Individuation; Isolation, 

 physiological. 



Individuation: in posterior region of 

 Planaria dorotocephala, 123; different 

 kinds of, 199; nature of, 225; degree 

 of, 227, 239, 240, 266, 304, 460; of 

 plant as a whole, 237; in vegetative 

 reproduction in plants, 238; in spore- 

 bearing parts of plants, 241 ; in embry- 

 onic tissue of plants, 243; in plant 

 spore, 252; in relation to death, 304. 

 See also Dominance; Individual; 

 Isolation, physiological. 



