Autotomy, 110, 142, 150-155; theories of, 155-158. Baer, von, 208. Balbiani, 66, 129. Bardeen, 41, 136. Barfurth, 21, 45, 54, 129, 137, 197, 199, 200. Begonia, 23; B. discolor, 74. Beneden, Van, 210. Beroë ovata, 239. Bert, 178. Bickford, E., 57, 202. Biophors, 278. Bipalium, 13, 14, 104; grafting, 170. Birds, 97, 106. Bizozzero, 128. Blastomeres, 19, 110. Blastulæ, fusion of, 188. Blood vessels, 120, 122-123. Blumenbach, 112. Bock, von, 149. Bombinator igneus, 184. Bones, 113, 124, 181. Bonnet, 1; experiments with worms, 2, 26, 38, 41, 92, 112, 200, 260, 261, 267. Bordage, 97, 100, 157. Born, 182-183, 243. Boulenger, 214. Boveri, 68, 228. Braefeld, 17, 80. Braem, 211. Brandt, 65. Breaking-joint, 150-152. Brindley, 100, 104. Brittle-stars, 105, 144, 145. Broussonet, 97. Bryozoa, 211. Budding, 142, 149-150. Bülow, 190, 213. Bunting, 237. Byrnes, 182. Callus, 82, 83. Camerano, 92. Campanularia, 35. Carniola, 106. Carodina, 213. Carrière, 104, 213. Cat, 179. Caterpillar, 100, 104, 154. Cause, 287, 290. Cells, origin of, 190-215. Cephalodiscus, 149. Cerianthus membranaceous, 41, 104. Cermatia forceps, 100. Cestodes, 103, 146. Chabry, 236. Chætogaster, 146. Chætopterus, 189. Chun, 238. Ciona intestinalis, 42. Closing wound, 69. Cockroach, 100, 104. Cœlenterates, 145, 149. Cohnheim, 118, 119. Colucci, 112, 203. Conifers, 76 (footnote). Conklin, 116. Connective tissue, 180, 181. Contact, 33, 37. Coprinus stercorarius, 86, 87. Corals, 142. Crab, 43, 151, 152, 158. Crampton, 236, 240, 245. Crayfish, 100, 151, 157. Crepidula fornicata, 116. Crinoids, 105. Crystal, regeneration of, 263-264. Ctenodrilus monostylos, 144, 148. Ctenodrilus pardalis, 144, 148. Ctenophore-egg, 238-241. Ctenophores, 142. Cuvierian organs, 105. Cytotropism, 69, 281. Dalyell, 129, 144. Darwinism, 108. Darwin’s pangenesis, 278. Delage, 25, 92. Dendrocœlum, 104. Difflugia, 103. Double structures, 128, 135-141. Driesch, definition of regeneration, 21, 22; reparation, 22; regulation, 22; restitution, 22; self-regulation, 22; antennularia, 32; 43, 57, 59, 60, 135, 139, 188, 202, 228-236, 243, 246, 248, 250, 251, 252-255, 257, 267, 268, 274, 280, 281-287. Driesch and Morgan, 239-241, 245. Du Bois-Reymond, 286. Dugès, 136. Duhamel, 178. Duyne, van, 136, 140, 141. Dwarfs, 116. Earthworm (Allolobophora fœtida), 9, 12, 38-39, 40, 53, 144, 170, 194, 271, 280, 290. Echinoderms, 105, 144. Echinus microtuberculatus, 68. Egg, 18, 19, 139, 188, 216. Embryo, 18, 110, 216; grafting in, 182-189; union of, 188; tension hypothesis, 274. Endres, 221. Epeiridæ, 100. Epimorphosis, 23. Epithelium, 180. Eudendrium racemosum, 29, 30, 103. External factors, 26. Eye, 203; crustacea, 30; lens, 203-205. Factors, 277. Faraday, 136. Fiedler, 228. Fischel, 112, 205-207, 240, 291, 292. Fischer, 124, 178. Fish, 6, 97, 131-133, 274, 281; lens, 290.