INDEX OF SUBJECTS 



331 



Hydranth, see Hydroids. 

 Hydrochlorate of morphine, 128-130. 

 Hydrogen, effect of, 109-111, 132. 

 Hydroids, growth of stolons and hy- 



dranths, 5 ; attachment of, 272 ; 



from isolated blastomeres, 181. 

 Hydroxyl, 150, 151. 

 Hyoid of tadpoles, enlarged, 114. 

 Hypertonic solutions, see Osmotic 



pressure. 

 Hypotonic solutions, see Osmotic 



pressure. 



Idiochromatin, 258. 



Idioplasm, 159. 



Idioplasma, in the nucleus, 19. 



Ilyanassa, segmentation, 26, 214. 215 ; 

 isolated blastomeres, 215-217 ; re- 

 moval of polar lobe, 217. 



Immigration, see Cells, movements 

 of, 



Immunity, 290. 



Increase of mass, 58, 115; of self- 

 differentiation, 7o, 176, 277, 284 ; 

 of structure, 2, 279. 



Increments, percentage of growth, 

 60. 



Index, mitotic. 65 ; of development, 

 103. 



Individuality of chromosomes and 

 chromatin, 252, 256, 265, 266. 



Induction, 282, 283. 



Inequalities, local, of growth, see 

 Growth. 



Inequipotential, 176, 277. 



Inheritable qualities, represented 

 by units in the germ, 19, 159, 246, 

 247, 279, 280. 



Inheritance, material basis of, 1, 19. 

 252 ; Aristotelian explanation of, 

 294 ; mechanism of, 1, 19, 280. 



Injuries, local, the cause of local de- 

 fects, 17, 159. 



Insects, gut of, 5 ; pupae, phagocy- 

 tosis in, 5 ; segmentation of, 24 ; 

 polar nuclei, 29 ; eggs of, and grav- 

 ity, 78 ; symmetry of egg and em- 

 bryo, 245. 



Insemination, first effect of, in Frog, 

 79. 



Insufficiency of material, see Poten- 

 tialities, limitation of. 



Interactions of the parts, 271-277, 

 284. 



Internal conditions of development, 

 see Development. 



Interruptions of continuity, see Cells, 

 movements of. 



Invaginations, see Cells, movements 

 of. 



Investment by cells, see Cells, move- 

 ments of. 



Iodides, 133. 



Iodine, 141, 145. 



lon-proteids, .136. 



Ions, 135, 136, 140. 



Iris, 276. 



Iron, 141. 



Irregular distribution of chromo- 

 somes, see Chromosomes. 



Irregularities of segmentation, see 

 Segmentation. 



Ischnochiton, 25, 46. 



Isobilateral segmentation, see Seg- 

 mentation. 



Isopoda, 24. 



Isotonic solutions, 120, 123, 124, 

 140, 142. 



Isotropy of egg, 18, 158, 202, 280 ; of 

 blastoderm, 179. 



Jelly of Frog's spawn, 42, 43, 79. 

 Judgement, Kritik of Teleological, 

 286-289. 



Karyokinesis, without calcium, 150 ; 

 significance of, 252. 



Karyokinetic plane, 185. 



Kidney, larval, of Lamellibranchs, 5 ; 

 tubules, branching of, 6 ; anas- 

 tomoses of, 6 ; tubules (meso- 

 nephric),fusionwithvasaefferentia, 

 6 ; tubules in metanephric blas- 

 tema, 11. 



Labrax, 145. 



Lacertilia, inner wall of pineal vesicle, 

 9. 



Laeotropic division, see Cell-division. 



Lamellae, systems of, 41 sqq. 



Lamellibranchs, larval kidney of, 5. 



Laodice, 181. 



Lappets of Pilidium, 204, 207. 



Larva, of Sponges, 6 ; of Dicyemi- 

 dae, 11 ; of Coelenterates, 6 ; 

 characters of, developed early, 3 ; 

 partial, see Blastomeres, isolated, 

 (Hid Egg-fragments. 



Latitudinal division, 22, 24, see also 

 Cell-division. 



Law, Biogenetic, 12, 16; of alterna- 

 tion of direction of cleavage in 

 ' spiral ' eggs, 25 ; Sachs', 28, 40 ; 

 Weber's, 272. 



Laws of causation, 13, 285, 298. 



Leg, rate of growth of, 70. 



Lens, outer layerof, 7 ; absent, in cer- 

 tain solutions, 134 ; causes of for- 

 mation, 275, 276. 



