G. Galago, 158. Galaxias, 147. Galeus vulgaris, 172. Galton, Mr. F., 97, 113, 228. Gascoyen, Mr., 182. Gavials, 43. Gegenbaur, Prof., 176-178. Gemmules, 208. Generative system, its sensitiveness, 235. Genesis of morals, 201. Geographical distribution, 144. Geographical distribution explained by Natural Selection, 6. Geometrical increments of time, 139. Geotria, 147. Giraffe, neck of, 24. Gizzard-like stomach, 83. Glacial epoch, 150. Glyptodon, 110. Godron, Dr., 101. Goose, its inflexibility, 119. Goeppert, Mr., 101. Gould, Mr., 88. Grasshopper, Great Shielded, 89. Gray, Dr. Asa, 253, 255, 261. Great Ant-eater, 83. Great Salamander, 172. Great Shielded Grasshopper, 89. Greyhounds in Mexico, 99. Greyhounds, time for evolution of, 138. Guinea-fowl, 120. Guinea-pig, 126. Guenther, Dr., 145, 146, 172. H. Hairless Dogs, 174, 175. Hamilton, Sir Wm., 267. Harmony, musical, 54, 279. Heart in birds and reptiles, 158. Hegel, 217. Heliconidae, 29. Hell, 194. Heptanchus, 172. Herbert Spencer, Mr., 20, 28, 67, 72, 163-166, 168, 170-172, 184, 187, 202, 203, 205, 218, 228, 245, 246, 248, 251. Hessian flies, 170. Heterobranchus, 146. Hewitt, Mr., 124, 181. Hexanchus, 172. Hipparion, 97, 134. Homogeny, 158. Homology, bilateral or lateral, 156, 164. Homology, meaning of term, 7, 156. Homology, serial, 159. Homology, vertical, 165. Homoplasy, 159. Honey-suckers, 90. Hood of cobra, 50. Hook-billed ducks, 100. Hooker, Dr., 150. Horned flies, 93. Horny plates, 40, 42. Horny stomach, 83. Human larynx, 54, 278. Humphry, Professor, 163. Hutton, Mr. R. Holt, 202, 203. Huxley, Professor, 67-69, 71, 72, 95, 103, 109, 130, 131, 137, 141, 163, 172, 173, 231, 247, 273. Hybrids, mortality of, 124. Hydrocyonina, 146. Hyperphysical action, 253. Hyrax, 179. I. Ichthyopsida, 109. Ichthyosaurus, 78, 106, 132, 177. Ichthyosis, 183. Iguanodon, 71. Illegitimate symbolic conceptions, 251. Illustration by clock-thinking, 249. Imaginal disks, 46, 170. Implacental mammals, 67, 68. Independent origins, 152. Indian butterfly, 30. Indian region's butterflies, 83. Indians and cholera, 192. Individual, meaning of word, 2. Infirm, care of, 192. Influence, local, 83. Insect, walking-leaf, 35. Insects, walking-stick and bamboo, 33. Insectivora, 68. Insectivorous mammals, 148. Insectivorous teeth, 68. Instinct of bull-dog, 260. Intermediate forms, 128. Intuitions, primary, 251. Irregularities in blood-vessels, 182. Isaria felina, 115. [Page 293] J. Japanned Peacock, 100. Jews, 212. Joints of backbone, 157, 162. Jugular fishes, 39, 141. Julia Pastrana, 174. K. Kallima inachis, 31. Kallima paralekta, 31. Kangaroo, 42, 67. Kowalewsky, 81. Knee and elbow affections, 183. Koelliker, Professor, 104.