INDEX OF SUBJECTS 



325 



296, 297, 298 ; formal, 13, 293, 296 ; 

 efficient, 13, 296, 297, 299 ; final, 

 20, 296, 297, 299 ; material, 294, 

 296, 299. 



Cavities, development of, 11. 



Cavity perivitelline, 79 ; and sagittal 

 plane in Frog, 165-168 ; segmenta- 

 tion, see Segmentation cavity. 



Cell-plate, 41. 



Cells, animal and vegetative, differ- 

 ences in potentiality, 191, 204- 

 206, 242. 



division of (see also Segmenta- 

 tion), a factor in development, 

 2. 22 sq. ; not necessarily a pro- 

 cess of differentiation, 22, 166, 

 245, 246, 279; meridional, 22, 

 32 ; in compressed eggs, 34, 36 ; 

 equatorial, 22; latitudinal, 22, 32; 

 in compressed egg. 34, 36 ; dexio- 

 tropic, 26, 28; laeotropic, 26, 28; 

 alternation of direction of, 25, 28 ; 

 direction of, 29, 54 ; depends on 

 that of nucleus, 31, 48. 55; pressure 

 experiments on, 34-39 ; and yolk, 

 24, 29, 48 ; and surface-tension. 

 41 sqq. ; influence of gravity on, 

 78 ; influence of electricity on, 93 ; 

 unequal, 29, 30, 168 ; rate of, 29, 

 261 ; suppressed, 55, 56, 106, 117 ; 

 simultaneous division of the ovum 

 into several cells, 55, 56, 118, 128, 

 130, 264, 265 ; in plant-cells, 41 ; 

 qualitatively unlike, 158, 286 ; 

 power of, restored in fertilization, 

 252. 



follicle, of Tunicata, 5 ; and cell 

 aggregates, movements of (Daven- 

 port), 4 sqq. ; movements of, in seg- 

 mentation. 29, 42. 222; number of, 

 in partial embryos or larvae : in the 

 Newt, 173 ; in Amphioxus, 181 ; in 

 Coelenterata, 182 ; in Echinoids, 

 197, 269; in Nemertines, 206; 

 separation of, 45, 105, 145. 



Cellulation, 162. 



Cellulose, 58. 



Centrifugalized eggs, 29, 87, 88. 



Centrosomes, heterodynamic, 30 ; in 



artificial parthenogenesis. 124, 125; 



direction of division, 40 ; division 



prevented, 265, 267. 

 Cephalopods, blastoderm of, 6 ; 



segmentation of, 27 ; symmetry 



of egg and axes of embryo, 245. 

 Cerebratulus, isolated blastomeres and 



egg-fragments, 204-208. 

 Cestoda, 28. 

 Cetochilus, 22. 

 Chaetopods. artificial partheno- 



genesis, 124; pressure experiments, 

 39, 213. 



Chaetopterus, 214. 



Chemical agents, effect of various, 

 126 sqq. ; need of, 142-152. 



Chemically equivalent solutions, 140. 



Chemotactic, 55, 273. 



Chest-girth, change in rate of in- 

 crease of, 70. 



Chick, Harvey, 14 ; Malpighi, 15 ; 

 deBuffon, 15; percentage of water 

 in, 59, 60 ; decline of growth- 

 rate, 67 ; effect of electric current, 

 91 ; influence of light of various 

 colours, 96 ; respiration of, 109, 

 110, 113; effects of heat and cold, 

 102-105 ; effects of poisons, 132. 



Chloral hydrate, effect on fertiliza- 

 tion, 128-130. 



Chlorates, 145. 



Chlorides, 123, 133 ; see also Sodium 

 chloride, and Chlorine. 



Chlorine, necessity of, 145. 



Chloroform, 42 ; and vitelline mem- 

 brane, 129. 



Chondrin, 58. 



Chorion, of Teleostei, 35. 



Choroid, 273 ; choroid fissure, 273. 



Cttorophiliis, 120 ; acclimatized to 

 salt, 136. 



Chromatin, the vehicle of inheri- 

 tance, 252 ; individuality of, 256, 

 265, 266. 



Chrcmosomes, number of, varied 

 artificially. 267 ; in merogony, 

 267 ; in artificial parthenogenesis, 

 125, 267; and cell-volume, 268; 

 and size of nucleus, 268 ; and 

 number of cells, 268 ; irregular 

 distribution of, in poisoned eggs, 

 128-130 ; in dispermic eggs, 253, 

 265 ; individuality of, 252, 256 ; 

 diminution of, 252, 256-258. 



Cilia, apical tuft of, in Plutei, with- 

 out sulphate, 144 ; in Pilidium, 

 204-206. 



movement of, 135 ; independent 

 of sulphates, 144 ; without magne- 

 sium, 147 ; in neutral media, 151. 



Ciliated ring of Pluteus, without 

 sulphate, 144 ; without calcium- 

 carbonate, 148; of Mollusca and 

 Polychaeta, 213, 220. 



Cirrhipedes, segmentation of, 22, 24 ; 

 fertilization and egg-structure, 250. 



Clausilia, decrease of variability, 74. 



Cleavage, see Segmentation. 



Clepsine, germ-bands of, 6 ; polar- 

 rings, 251. 



Clove-oil, 54. 



