INDEX OF SUBJECTS 



323 



embryo, 165 ; apical organ formed 

 at, 244. 



Anion, 136. 



Annelids, germ-bands of, 5 ; nephri- 

 dia and coelom, 6 ; nerve-ganglia 

 of, 11 ; segmentation of, 25, .48 ; 

 symmetry of egg and that of 

 embryo, 241. 



Antecedent conditions, 283. 



Anledon, pressure, 37 ; heterogeneous 

 cross-fertilization, 262. 



Antennularia, 272, 273. 



Antidotes to poisons, 135, 136. 



Antitoxicity, 136. 



Apical body, 123. 



Apical organ of Echinoids, 144 ; of 

 Pilidium, 204-206 ; of Ctenophora, 

 211 ; of Patdla, 218 ; of Dentalium, 

 224-225 ; of Molluscs and Annelids, 

 244. 



Aplysia, 46, 47. 



Aplysia depilans, 30 ; limacina, 30, 45. 



Arachnids, 24. 



Arbacia, suppression of cell-division, 

 56, 117 ; artificial parthenogenesis, 

 108 ; need of oxygen, 112 ; effect of 

 atropine, 131 ; of sodium hydrate, 

 151 ; hybridization experiments, 

 261. 



Archenteron, of Echinoderms, 3, 185; 

 in lithium larvae, 137; of Amniota, 

 8 ; in Hemigastrula, 159 ; everted, 

 see Exogastrula ; in double monsters 

 of Frog, 172 ; tip of, removed, 195 ; 

 of partial larvae, 198, 205, 221. 



Architecture of nucleus in Mosaic 

 Theory, 19. 



Area vasculosa, 110. 



Arenicola, segmentation of, 26, 30, 

 47 ; effect of ions on larvae, 135. 



Arm, rate of growth of, 70 ; varia- 

 bility, 74 ; of Pluteus, see Pluteus. 



Arrangement of systems of drops or 

 bubbles, 43, 44. 



Arrest of development at low tem- 

 peratures, 97, 99, 102, 104. 



Arrhenokaryotic, 267. 



Arthropods, blastoderm of, 5, 114 ; 

 muscles of, 5 ; somites of, 11 ; 

 nerve-ganglia of, 11 ; segmentation 

 of, 24. 



Artificial parthenogenesis, see Par- 

 thenogenesis. 



Ascaris lumbricoides, 258. 



Ascaris megalocephala, segmentation of, 

 27, 28, 34, 47 ; cell-movement, 29; 

 simultaneous division of related 

 cells, 31 ; eggs poisoned by oxygen, 

 112 ; fusion of eggs to form double 

 monsters, 202 ; symmetry of egg 



and embryo, 245 ; diminution of 

 chromosomes, 252, 253, 256-258 ; 

 individuality of chromosomes, 256; 

 dispermy, 257. 



Ascaris nigrorenosa, 33, 34. 



Ascidians, segmentation of, 24, 26, 

 47, 54, 229, 235 ; effect of solutions, 

 140 ; isolated blastomeres, 230, 

 237 ; symmetry of egg and that of 

 embryo, 229, 235, 245. 



Ascidiella, egg- and embryonic axes, 

 isolated blastomeres, 229, 230. 



Asplanchna, unequal asters, 30 ; 

 fertilization spindle, 34, 48. 



Asters, spiral, 40 ; unequal, 30 ; in- 

 duced by salts, 124, 125; altered 

 by alkaloids, 128 130. 



Asterias, flattening of blastomeres, 

 45 ; artificial parthenogenesis, 108 ; 

 effect of atropine, 131 ; exogas- 

 trulae, 140 ; necessity of sulphate, 

 144 ; necessity of potassium, 146 ; 

 blastomeres without magnesium 

 fall apart, 148 ; blastula cut up, 

 194 ; tip of archenteron removed, 

 195 ; coelom-sacs removed, 195 ; 

 ochracea, heterogeneous cross-fertili- 

 zation, 262. 



Asteroids, segmentation of, 24, 26, 

 28, 47, 54. 



Atmospheric pressure as affecting 

 growth, 2; reduced, 109, 110; 

 increased, 114. 



Atrium, 229. 



Atropine, 131. 



Attachment of cells to other bodies, 5. 



Auditory vesicle of Vertebrates, 6. 



Axes of embryo, see Embryonic axes. 



Axial organs, correlations between. 

 75. 



Axis cylinder, 273. 



Axis of egg, see Egg axis. 



Axolotl, 119. 



Bacterial toxines, 132. 



Barium, 150. 



Bases, 122. 



Batrachus, 178. 



Beginnings, knowledge of, 289, 298. 



Belgians, growth of, 63. 



Benzole, 42. 



Beroe, pressure experiment, 39 ; iso- 

 lated blastomeres and egg-frag- 

 ments, 209-211. 



Bilateral segmentation, see Segmen- 

 tation. 



Bilateral symmetry, see Symmetry. 



Bile-capillaries, 6. 



Bipinnaria, necessity of sulphate, 144. 



