Roots, 80. Rothig, 112. Roux, definition of Regeneration, 20, 22, 183, 216-226, 243, 250, 252, 256, 288. Sachs, 81, 88, 89; theory of Regeneration, 265-267. Salamander, 5, 6, 11, 43, 200, 213, 214, 270. Salamandra maculata, 205. Salensky, 210. Salivary gland, 112, 113, 180. Salix viminalis, 77. Samuel, 118. Sarasin, 102. Sars, 102. Schaper, 182. Schmidt, O., 103. Schmitz, 65. Schostokowitsch, 85. Schreiber, 106. Schuberg, 129. Schultz, 100, 101, 102, 154. Schultze, 139, 225-227. Scudder, 100, 154. Scutigera forceps, 154. Scyphistoma, 104, 142, 149. Scyphozoa, 104. Sea-urchin, 18, 19, 105. Sea-urchin’s egg, 228. Seeliger, 68, 210. Self-division, 142. Self-regulation, 22. Semper, 93, 190. Sertoli’s cells, 181. Sharks, 105. Siredon, 199. Skin, 178, 179, 180. Snail, 213. Snakes, 106. Spallanzani, Prodromo, 1, 4; experiments with earthworms, 4; tadpole, 5; salamanders, 5; snail, 5, 26, 38, 104, 153, 182, 200. Spemann, 227. Spencer, Herbert, 263. Sphærechinus granularis, 68. Spiders, 100, 104. Spina bifida, 6. Spleen, 124. Sponges, 103, 142, 143, 149. Spur of cock, 178. Starfish, 18, 19, 102, 103, 105, 110, 144, 153, 214, 284. Stenopus chrysops, 133, 274, 281. Stentor, 14, 15, 56, 66, 67, 103, 129. Stimulus, 283, 284, 285. Stomobranchium mirabile, 142. Stork, 97. Strassen, zur, 189. Stricker, 119. Stuffs, 265-269. Syllids, 143. Syllis ramosa, 149. Tadpole, 11, 45; closing of wound, 70; 106, 137, 182-186, 197, 199-200. Tail, 197. Tapeworm, 143. Tarantula, 100, 154. Teleology, 282, 288-292. Teleost’s egg, 237. Temperature, 26-27, 37. Tension, 272-278; in egg, 274. Testes, 117, 124, 181. Tetrastemma, 104. Thallasicolla nucleata, 67. Theories of Regeneration, 260. Tornier, 54, 137, 139, 214. Tower, 203. Towle, 97, 201. Townsend, 66. Trachea, 180. Transplantation, 179. Trematodes, 104. Trembley, 1; experiments with hydra, 2, 20, 26, 38, 43, 159, 202. Triclads, 104. Triton cristatus, 137. Triton eye, 112; lens, 112. Triton marmoratus, 106. Tubifex, 104, 191. Tubularia, 25, 33, 34, 52, 56-62, 69, 70, 103, 129, 167-168, 267, 273. Turtles, 106. Urodeles, 106, 197. Valle, della, 210. Vernon, 68. Vertebræ, 181. Verworn, 66, 67. Virchow, 115. Vitalism, 277, 284, 285. Vöchting, 16, 57, 71-91, 131, 176, 269. Vries, de, 278. Vulpian, 182. Wagner, von, 144, 149, 190, 192. Wagner, W., 100. Walter, 221. Wax glands, 180. Weigert, 118, 119. Weismann, 93-96, 97, 101, 106, 108, 112, 129-130, 245, 252, 256, 261-263, 278. Wetzel, 159, 169, 227. White ants, 154. Whitman, 280. Whole embryos, of reduced size, 222. Wiesner, 278. Willow, 71-82. Wilson, E. B., 68, 139, 231, 237, 250, 251, 256. Wolff, C. F., 207, 208. Wolff, G., 112, 203, 205, 206, 291, 292. Zahn, 124, 178. Ziegler, 115, 118, 119, 121, 240-241, 243, 246. Zoja, 237. FOOTNOTES: