326 



INDEX OF SUBJECTS 



Clymenetta, 46. 



Clytia, 181. 



Cocain, effect on fertilization, 128- 

 180. 



Coefficient of growth, 65 ; of varia- 

 bility. 71, 72, 73 ; of con-elation, 

 75. 



Coelenterata, skeleton in, 2 ; uni- 

 polar immigration in, 11 ; segmen- 

 tation of, 22, 28, 47, 64 ; develop- 

 ment, of isolated blastomeres, 181. 



Coelom, of Echinoderms, 3 ; of 

 Annelids, 6 ; epithelium of, and 

 gonads, 7 ; lumen of, 11 ; sacs 

 removed, 195. 



Cohesion of blastomeres, 45, 148, 

 150. 



Cold, effects of, on segmentation and 

 development, 99 sqq. ; on fertiliza- 

 tion, 107, 108; arrest of develop- 

 ment due to, 97, 99, 102, 104; 

 together with potassium cyanide, 

 132 ; produces artificial partheno- 

 genesis, 108, 124 ; segmentation of 

 an isolated blastomere becomes 

 total, 216. 



Combination of original elements, 

 286. 



Composition, organs formed by, 3, 

 277, 285. 



Concentration of material of blasto- 

 poric lip in axis of embryo, 178 ; 

 of sea- water, 124. 



Concrescence of lips of blastopore, 

 178 ; of lavers, see Cells, movements 

 of. 



Conditions of development, see De- 

 velopment. 



Cone of entrance, 128. 



Connective tissue, 273. 



Consciousness, of the process, in 

 development, 20, 291, 297. 



Constriction, see Cells, movements of. 



Contact stimuli, 137, 272, 275-277. 



Contractility of cytoplasm, 130, 131. 



Contraction of muscles, inhibited by 

 magnesium, 135, 148 ; sodium 

 necessary for, 135, 145 ; potassium 

 necessary for, 147. 



Co-ordination, 284. 



Copper sulphate, 96. 



Cornea causes of formation, 275, 

 276. 



Corpus luteum, 5. 



Corpuscles, concentric, of thymus, 11. 



Correlation, 75 ; decrease in, 75, 

 277; between symmetry plane, first 

 furrow and sagittal plane, 167. 



Cosmic process, 298. 



Costae of Cteiiophora, 211, 212. 



Coiylorhisa, necessity of potassium, 

 146. 



Crab, see Carcinus. 



Crangon, 24. 



Crepidula, segmentation of, 26, 30 ; 

 asters and protoplasmicmovement, 

 40 ; flattening of blastomeres, 45 ; 

 parallel polar furrows, 46. 



Crescent, gray, see Gray crescent. 



Crinoids, 22. 



Cross-fertilization, see Hybrid. 



Cross furrow, see Polar furrow. 



Crustacea, segmentation of, 22, 24, 47 ; 

 eggs of, and gravity, 78 ; structure 

 of egg, and embryonic axes, 245. 



Crystalhdes, 181. 



Ctenolabi-us, cell-division suppressed, 

 56, 111; first furrow and sagittal 

 plane, 178 ; need of oxygen for, 

 111, 262. 



Ctenophora, segmentation of, 26, 

 208 ; micromeres, 30 ; pressure. 39 ; 

 influence of gravity on eggs, 78 ; 

 micromeres displaced, 211 ; isolated 

 blastomeres, 209, 210 ; egg- frag- 

 ments, 212; effect of fertilization, 

 250. 



Cijclas, 26. 



Cyclops, 22. 



Cynthia, development, 230 ; isolated 

 blastomeres, 237 ; symmetry of 

 egg, 232, 250. 



Cytarme, 45, 53. 



Cytasters, 125. 



Cytochorismus, 45. 



Cytolisthesis, 53. 



Cytoplasm, organ-forming substances 

 in the, 19, 208, 212, 213, 217, 224, 

 225, 228, 233, 236, 240, 241, 246, 

 280, 286. 



nucleus and, 31, 131 ; ratio be- 

 tween, 65, 269 ; inter actions of, 

 266, 283, 284. 



increase of, in differentiation, 65, 

 66 ; ascent of, in inverted eggs, 84 ; 

 receptive to stimuli, 283 ; para- 

 lysed by poisons, 127 ; contrac- 

 tility of, 130, 131 ; determines 

 diminution of chromosomes, 257. 



Cytotaxis, 55. 

 Cytotropism, 55, 273. 



Daphnella, 24. 



Daphnia, 24. 



Darkness, Fundulus embryos, 94 ; tad- 

 poles of Frog, 95 ; eggs ofLimnaea, 

 95 ; Echinoid larvae, 96. 



Death-rate, selective, 74 ; in various 

 lights, 94-96 ; in desiccators, 115 ; 

 of heterogeneous hybrids, 262. 



