Fish’s eggs, 237. Flatworms, see Planarians. Food, influence of, 27, 37, 120, 122, 123. Force, 76, 287. Formative forces, 255, 277, 288. Formative stuffs, 40, 88, 89, 90, 91. Fraisse, 21, 97, 196, 197, 198, 199, 200, 214. Fredericq, 151, 152. Frogs, 106. Frogs’ egg, 216. Fundulus eggs, 237. Fundulus heteroclitus, 45, 97, 274. Gastroblasta Raffælei, 142, 145. Gerassimoff, 66. Germ-layers, 207-212. Giants, 115. Giard, 92. Godelmann, 154. Goebel, 22, 85, 86, 88, 89, 90. Goette, 106, 200, 201, 213. Gonionemus, 104, 125. Grafting, 159-189. Gravity, influence of, 30-33, 37. Grawitz, 119. Growth, 128, 131-135, 269-271, 278, 292. Gruber, 66. Guinea pig, 179. Haberlandt, 66. Haeckel, 102, 208, 216. Half-embryos of frog, 216-226. Hargitt, 125, 127, 168, 169. Harmony, 282. Harrison, 186, 187. Heart, 124. Heineken, 100. Helicarion, 93. Heliotropism, 271. Hepke, 190, 192. Herbst, 30, 214, 286. Hermit-crab, 63, 97-99; autotomy, 155. Herrick, 153. Hertwig, O., 22, 23, 222-227, 243, 246, 251, 252, 256, 278, 280, 288. Hertwig, R., 228. Hescheler, 44, 194, 196. Heterocentron diversifolium, 74, 80. Heteromorphosis, 24, 38-42. Heteronereis, 143. Heterotropy, 280. His, 241. Hjort, 210. Hofer, 66. Holomorphosis, 24. Holothurians, 105, 145, 154. Homology, 209. Homomorphosis, 23. Hunter, 178. Huxley, 208. Hyacinthus orientalis, 88. Hydra, 1, 2, 11, 56, 103, 121, 122, 124, 142, 149; grafting, 159-166, 203, 270, 272. Hydra grisea, 169. Hydra fusca, 169. Hydractinia, 103, 168. Hyperplasy, 115. Hypertrophy, 111, 115-123. Idiosomes, 278. Ilyanassa obsoleta, 240. Internal factors, 38, etc., 52-54. Internal organs, 52-54, 111. Iris, 204-207. Ischikawa, 203. Jelly-fish’s eggs, 237. Joest, 170-175, 186. Kennel, von, 147, 148, 149. Kidney, 113, 116, 124, 180. King, 102, 103, 125, 135, 139, 153, 162, 214. Klebs, 66, 118, 120. Knight, 75. Knowlton, 27. Kochs, W., 112. Kowalevsky, 208, 210. Kretz, 112. Kroeber, 196. Lamarckianism, 157. Lang, 92, 93. Lateral Regeneration, 9, 10, 28, 29, 43. Leeches, 146. Lefevre, 210, 211. Lepelletur, 100. Lepismium radicans, 78. Lessona, 92, 93. Liability to injury, 92-110; view of Réaumur, 92; of Bonnet, 92; of Darwin, 92; of Lang, 93; of Semper, 93; of Weismann, 93-96. Light, influence of, 29, 30, 37. Lillie, 26, 56. Limnæa, 104. Linckia multiformis, 102. Lithium salts, 286. Liver, 111, 180. Liverworts, 16. Lizard, 6, 94, 106; double tail, 137-139; 198, 214, 290. Lobster, 153. Loeb, J., 24, 29, 30, 31, 33, 34, 35, 42, 59, 67, 68, 102, 114, 131, 139, 141, 189, 231, 267, 268. Loeb, Leo, 179. Ludwig, 105. Lumbricus rubellus, 172, 174, 175. Lumbriculus, 43, 104, 144, 149, 190, 191. Lung, 112. Lunularia vulgaris, 84, 85. Lymphatic glands, 121; grafting upon, 179. Machine theory, 281. Mammals, 97, 117-118; grafting, 178. Man, 107; grafting, 178, 179. Mantis, 100, 104. Margelis carolinensis, 34.