470 



SENESCENCE AND REJUVENESCENCE 



Axis, organic: presence of, 200, 203; of 

 polarity and symmetry, 200, 201, 203; 

 as metabolic gradient, 209, 225. See 

 also Axial gradient. 



Axolotl, 389. 



Banana, vegetative propogation of, 239, 

 370. 



Bee, parthenogenesis in, 345, 395. 



Begonia: dedifferentiation in, 246; con- 

 trol of flowering in, 376. 



Biaxial forms: in Tubularia, 210; in 

 Planaria dorotocephala, 213; in Plana- 

 ria simplicissima, 215. 



Biogene hypothesis, 15. 



Biogenetic law, significance of, 463. 



Biometer, 73, 156, 160, 202. 



Branchipus: conditions of hatching in, 

 404; larval metamorphosis in, 422. 



Budding: in hydra, 145; in Pennaria, 

 147, 150; in plants, 231, 239; adven- 

 titious, in plants, 229, 246. 



Carbon-dioxide production: decrease of, 

 in narcosis, 71; estimation of, 73, 202; 

 during starvation in Planaria doro- 

 tocephala, 161; decrease of metabolic 

 rate by, 188; in nervous system of 

 Limulus, 273; in early development of 

 Aplysia limacina, 411. See also Meta- 

 bolic rate; Oxidation; Oxygen con- 

 sumption. 



Cassiopea, reduction of, during starva- 

 tion, 163. 



Catalysis: role of colloids in, 25; retar- 

 dation of, 67, 184; by products of 

 reaction, 446. See also Autocatalytic 

 reaction. 



Cell: embryonic or undifferentiated, 48, 

 51 , 242 ; differentiation and dedifferenti- 

 ation of, 52, 57, 239, 245, 257, 286, 294; 

 metabolic conditions in, 39, 51, 183; 

 relation of, to life, 41; division of, in 

 infusoria, 137; in starvation, 155; 

 cyclical changes in, 189, 297; axes of, 

 200; plant spore as specialized, 247, 

 253; nucleoplasmic relation in, 284, 

 285, 41 8, _ 439, 440; length of life of, 

 307; origin of gametic, in plants, 316; 

 differentiation of gametic, hi plants, 

 316, 334, 337; origin of gametic, in 

 animals, 323 ; differentiation of gametic 

 in animals, 334, 339. See also Dediffer- 

 entiation; Differentiation; Gamete for- 

 mation; Gametes; Infusoria; Nervous 

 system. 



Chaetopterus pergamentaceus: axial gradi- 

 ent in embryo of, 203; susceptibility in 



eggs of, after fertilization, 406; reju- 

 venescence during early development 

 of, 415. 



Chara, gametes of, 316. 



Chironomus, germ path of, 328. 



Chromatin, diminution of, 324, 328. 



Chromosomes, haploid and diploid num- 

 ber of, 322 footnote 2, 353. 



Chrysanthemum, dedifferentiation in, 246. 



Clavellina, dedifferentiation in, 258. 



Colloids: characteristics of, 21; suspen- 

 soid, 21 ; emulsoid, 21; significance of , 

 for morphogenesis, 22; role of, in life in 

 general, 22, 26; in relation to water and 

 salts, 24; membranes composed of, 24; 

 as catalyzers, 25; role of, in transmis- 

 sion, 26; in relation to substratum, 41; 

 in relation to differentiation, 48; coagu- 

 lation of, in relation to temperature, 49 ; 

 changes of, with time, 50, 184. See 

 also Proteids; Substratum. 



Colony: in Pennaria, 148; in plants, 

 237,369- 



Colpidium: rejuvenescence of, in agamic 

 reproduction, 141 ; susceptibility of, at 

 time of conjugation, 352, 381; effect 

 of prevention of agamic reproduction 

 on, 380. 



Conducting paths: in relation to physio- 

 logical correlation, 217, 260; in ani- 

 mals, 218, 224, 268; in plants, 238; 

 See also Conductivity; Dominance, 

 Transmission. 



Conductivity, 217, 218, 227,. 232, 260, 

 268. See also Dominance; Trans- 

 mission. 



Conjugation: Maupas' conclusions con- 

 cerning, 64, 377, 434; breeding with- 

 out, in Paramecium, 136, 377; experi- 

 mental determination of, 378; in 

 relation to endomixis, 379, 380; capa- 

 city of different races for, 381 ; effect of, 

 404. See also Fertilization. 



Correlation, physiological: mechanical, 

 217; chemical, 217, 224; transmissive, 

 217; increase in complexity of, in 

 higher animals, 266. See also Domi- 

 nance; Individual; Individuation; 

 Isolation. 



Correlative differentiation, 50. See also 

 Differentiation. 



Corymorpha palma: susceptibility in 

 relation to age of, 101; rejuvenescence 

 in reconstitution of, no. 



Crepidula, nucleoplasmic relation in, 419. 

 439- 



Cyclops, germ path in, 327. 



Cymatogaster, germ path in, 330. 



Cytomorphosis, 284, 440. 



