SUBJECT INDEX 



781 



PHASCOLOSOMA : artificial parthenogen- 

 esis in, 682, 772. 



PHOTOKINETICS : definition, 265; reac- 

 tions influencing, 286 ff. 



PHOXICHILIDIUM MAXILLAEA : regenera- 

 tion of, 338 ff . 



PHYSIOLOGICAL PROBLEMS : discussion 

 of, 497 ff. 



PHYSIOLOGIC UNIT: idea of, 322. 



PIGMENT : relation of, to gravitation, 190; 

 in Tubularia, 210; influence of lack of 

 oxygen on, 420. 



PLAGIOTROPIC ORGANS: definition, 2. 



PLAN ARIA: heliotropism in, 73, 77; pho- 

 tokinesis in, 287 ; heteromorphosis in, 

 344 ; brain physiology of, 352 ff . 



PLANORBIS: influence of light on seg- 

 mentation of, 427. 



PLANT LICE: heliotropism in, 45,49,50, 

 112; geotropism in, 50; temperature 

 effects on, 51, 108 : flight movements of, 

 54 ; movements of, not voluntary, 109. 



PLANULA : influence of light on, 433. 



PLASMODIA : geotropism in, 179. 



PLUMULARIA PINNATA : heteromorpho- 

 sis in, 137, 172. 



PODARKE: Parthenogenesis in, 682, 772. 



POLARITY: heliotropism as a factor in, 

 76; Allmann's theory of, 117, 129; as 

 r -gards Tubularia mesembryanthe- 

 mum, 128; in Cerianthus, 206, 215. 



POLYGOHDIUS ; change of sense of heliot- 

 ropism in, 273, 293, 417 ; locomotion in, 

 284. 



POLYPS : formation of, 124. 



PORTHESIA CHRYSORRHCEA : heliotropism 

 in, 19, 24-37, 112; stereotropism in, 21. 



POTASSIUM : effects of, on regeneration, 

 242, 252 ; effects of, on Fundulus, 296, 297. 



PRESSURE: effects of, on so-called in- 

 stinct, 110. 



PROTOPLASM: influence of light on, 6; 

 movements of, 212 ; isotropy in, 334. 



PROTOZOA : heliotropism in, 7. 



PYCNOGONIDES: regeneration of, 338 ff. 



QUANTITY OF WATER: influence on re- 

 generation and growth, 247, 252. 



RANA: influence of light on develop- 

 ment of, 427. 



REFLEXES: persistence of, inCiona, 218; 

 in Planaria, 355 ff. 



REGENERATION : Bonnet's theory of, 119 ; 

 definitipn of, 120; in Tubularia, 122; in 

 Ciona intostinalis, 217; influence of 

 concentration of sea-water on, 222; 

 necessity of oxygen for, 240; relation 

 of, to inorganic substances, 242, 245; 

 influence of quantity of water on, 247, 

 252; influence of magnesium on, 252; 

 quantitative limits of, 336; general 

 ideas on, 338; in Pantopods, 338; in 

 Chwtopods. 341; and nucleus, 505; of 

 organs in Hydroids, 627 ff. 



RESEG MENTATION: of Ctenolabrus eggs 



without oxygen, 378. 

 RESPIRATORY ORGAN : effect of light on, 



97. 

 RHEOTROPISM: in Eudendria, 141; in 



Plasmodia, 179, 182. 

 RHIZOPODS : regeneration in, 507. 



SACCHAROMYCES CEREVISI^E: a ferment 

 for glucoses, 498. 



SCYLLIUM CANICULA: geotropism in, de- 

 pendent on inner ear, 187. 



SEA-WATER: regeneration in, 222; con- 

 centration of, and influence on longi- 

 tudinal growth, 228; analysis of, 242; 

 influence of concentration of, on seg- 

 mentation, 257; effect of concentration 

 of, on heliotropism, 279-82. 



SEGMENTATION : of nucleus without seg- 

 mentation of protoplasm, 258. 



SERPULA: heliotropism in, 101, 106: pho- 

 tokinesis in, 289, 



SERTULARIA HALECINA: heliotropism in. 

 136. 



SERTULARIA (POLYZONIAS): heliotro- 

 pism in, 103; heteromorphosis in. 142, 

 173, 174, 249: change of sense of heliot- 

 ropism in, 266. 



SESSILE ANIMALS: heliotropism in, 

 90-106. 



SEXUALITY : relation of, to heliotropism, 

 52, 68, 113. 



SHARKS : geotropism in, 186. 



SIAMESE TWINS: formation of, 304 ff. 



SNAILS : heliotropism in, 73. 



SODIUM CHLORIDE: poisonous character 

 of solution of, 544 ff . 



SPERMATOZOA: stereotropism of , 23, 111. 



SPHINX EUPHORBIA : heliotropism in, 

 38 ff. 



SPIROGRAPHIS SPALLANZANII: heliotro- 

 pism in, 90-100; movements of, not in- 

 stinctive, 107; change of sense of heli- 

 otropism, 266. 



STENTOR VIRIDIS: influence of oxygen 

 on, 15. 



STEREOTROPISM: definition of, 23; in 

 Porthesia chrysorrhoea, 34; in Lepi- 

 doptera, 54; in plant lice. 54; in ants, 

 55; in June-bugs, 71 : relation of, to in- 

 stinct, 109, 111; in Tubularia mesem- 

 bryanthemum, 121, 124; in Aglaophe- 

 nia pluma, 135; in Plumularia, IMS; in 

 Sertularia, 143: in Hydroids 174; in 

 Antennularia antennina, 251; in Lum- 

 bricus foetidus, 360. 



STIMULATION: in heteromorphosis. 140; 

 threshold of, 219: latent period of, 221. 



STRONGYLOCENTRATUS FRANCISCANUS : 

 artificial parthenogenesis in, 626, 638, 

 644. 



STRONGYLOCENTRATUS PCRPURATUS: ar- 

 tificial parthenogenesis in, 626, 638, 644. 



SUNLIGHT: effect on Lepidoptera, 48; 

 effect on Polygordius, 277. 



