INDEX 



475 



in relation to age in plants, 239, 243, 

 246. 255; in relation to spore formation 

 in plants, 248, 251; in nervous system, 

 267; in relation to body surface, 271; 

 in relation to senile atrophy, 287; 

 during starvation in man, 298; during 

 starvation in fishes, 300; determined 

 largely by internal factors in warm- 

 blooded animals, 303 ; in differentiation 

 of gametes, 349, 350, 351; in flower 

 and its parts, 349, 374; in conjugating 

 infusoria, 352, 380; at stage of 

 maturation, 355; in plant at time of 

 flowering, 375; during development of 

 flower, 375 ; in relation to gamete for- 

 mation in hydra, 383; in germ cells of 

 trematode larvae, 396; after fertiliza- 

 tion in sea-urchin and starfish eggs, 

 405 ; after fertilization in annelids, 406 ; 

 evidence for increase of, during early 

 embryonic development of animals, 

 411, 412; in larva of Nereis, 414; 

 in relation to nuclear and cytoplasmic, 

 volume during early development, 419. 

 See also Metabolism; Susceptibility. 



Metabolism: chemical conception of, 14; 

 Hober's conception of, ig; physical, 

 of stream, 28; production of water in, 

 37; substratum as sediment of, 41; as 

 a reaction system, 43; change in char- 

 acter of, during differentiation, 50; in 

 relation to narcotic action, 67; in- 

 complete character of, 435; Kassowitz' 

 theory of, 442; constructive, in relation 

 to nucleoplasmic interchange, 444. See 

 also Metabolic rate; Susceptibility. 



Metamorphosis, larval: in Nereis, 421; 

 in Branchipas, 422; in insects, 422; 

 as a partial physiological disintegration 

 of individual, 423; in amphibia, 424. 



Metaplasm, 52, 439, 442. See also Cell; 

 Differentiation; Protoplasm. 



Miastor, germ path in, 328. 



Micronucleus: division of, 137; behavior 

 of, in endomixis, 143. 



Microspore, of seed plants, 320. 



Mimulus iilingii, influence of light on 

 flowering in, 371. 



Mnemiopsis leidyi, susceptibility of, in 

 relation to age, loi. 



Moniezia: dedifferentiation of paren- 

 chyme cells of, 258; origin of gametes 



in, 331- 

 Mucor: spore formation in, 248; gametes 

 of, 316. 



Narcotic action: general character of, 66; 

 theories of, 67; effect of, on transmis- 

 sion in nerves, 218; effect of, on recon- 

 stitution in Planaria dorotocephala, 222. 



Nephrodium, archegonium and egg of, 

 338. 



Nereis: axial gradient in embryos of, 203; 

 susceptibility of eggs of, after fertiliza- 

 tion, 406, 414; increase in suscepti- 

 bility during early development of, 

 414; metabolic rate in larva of, 414; 

 period of developmental rejuvenescence 

 in, compared with that of Arenicola, 

 415; segmentation in larva of, 421. 



Nervous system: of Planaria doroto- 

 cephala, 92; structure of, in relation 

 to degree of reconstitution in Planaria 

 dorotocephala, in; in relation to devel- 

 opmental gradients, 205; transmission 

 in, 218, 227, 230; in relation to physio- 

 logical integration, 224; physiological 

 stability of, 281, 297; water content 

 of, in relation to senescence, 283; nu- 

 cleoplasmic relation in cells of, during 

 development, 284; morphological age 

 changes in cells of, 287; dedifferentia- 

 tion in, 295; rejuvenescence in, 297; 

 in relation to death, 301. 



Normal form, in reconstitution of 

 Planaria dorotocephala, in. 



Nucleoplasmic relation: Minot's views 

 concerning, 284, 440; in development 

 of nerve cells, 285; in early embryonic 

 development, 418; R. Hertwig's views 

 concerning, 439; in relation to senes- 

 cence, 439. 



Nutrition: Putter's views concerning, 

 164; character of, in relation to age 

 cycle, 169, 179, 276, 388; difficulties of 

 experimental control of, 277; effect of 

 qualitatively inadequate, 278; effect 

 of quantitatively insufficient, 280; 

 effect of excess of, 298; in relation to 

 conjugation, 378; in relation to par- 

 thenogenesis and zygogenesis, 390, 

 392, 408; in relation to surface and 

 volume, 438. See also Reduction; 

 Starvation. 



Oedogonium: conditions of spore forma- 

 tion in, 252; gametes of, 316. 



Oligochetes: susceptibility of, in relation 

 to age, 102; increase in susceptibility 

 of, in reconstitution, no; increase in 

 susceptibility of, in agamic reproduc- 

 tion, 136; axial gradient in, 203, 205. 



Oogenesis: in animals in general, 340; 

 in hydra, 340; in Fasciola hepatica, 

 340; in Plumatella fungosa, 340; in 

 Sternaspis scutata, 341; in Dytiscus 

 marginalis, 342; in ascidian, 342; 

 in fish, 342; in Sida crystallina, 343; 

 in plant lice, 344. See also Gamete 

 formation; Gametes. 



