D. Dana, Professor, 149. Darwin, Mr. Charles, 2, 10, 12, 14-21, 23, 27, 34, 35, 43, 45, 47, 48, 55-57, 59, 65, 88, 94, 98-100, 107, 118-126, 129, 138, 142, 145, 149, 150, 181, 188-190, 196, 208, 209, 214-216, 218, 223, 233, 234, 252, 254, 258, 259, 275, 276. Datura tatula, 101. Delhi, days at, 98. Delpino, Signor, 212, 213, 215. Democritus, 217, 275, 288. Density of air for breathing, 99. Dentition, carnivorous, 110. Derivation, 238. Derivative creation, 252, 282. Design, 259. Devotion, 193. Dibranchiata, 74. Difficulties of problem of specific origin, 1. Digits, supernumerary, 122, 181. Digits, turtle's, 106. Dimorphodon, 71. Dinornis, 70. Dinosauria, 71. Diseased pelvis, 182. Dissemination of seeds, 65. Doris, 170. Dotheboys' Hall, 272. Dragon, the flying, 64, 158. Dragon-fly, 77. Droughts, 25. Duck-billed platypus, 175. Dugong, 41, 175. Duke of Argyll, 14, 276. Dyspepsia, 201. E. Ear, 74. Ear, formation of, 51. Early specialization, 111. Echinodermata, 44. Echinoidea, 44. Echinops, 148. Echinorhinus, 172. Echinus, 43. Economy, Fuegian political, 192. Eczema, 183. Edentata, 174. Egyptian monuments, 138. Elasmobranchs, 140. Elbow and knee affections, 183. Empedocles, 288. Eocene ungulata, 110. Eolis, 170. Equus, 97. Ericulus, 148. Ethics, 188. Eudes Deslongchamps, 99. Eurypterida, 141, 171. Eutropius, 147. Everett, Rev. R., 98. Evolution requires geometrical increase of time, 139. Eye, 76. Eye, formation of, 51. Eye of trilobites, 135. F. Fabre, M., 46. Feather-legged breeds, 181. Feejeans, 199. Fertilization of orchids, 55. "Fiat justitia, ruat coelum," 195. Fibres of Corti, 53, 279. Final misery, 194. Finger of Potto, 105. Fish, flying, 64. Fishes, fresh-water, 145. Fishes, thoracic and jugular, 39, 140. Fixity of position of limbs, 39. Flat-fishes, 37, 166. Flexibility of bodily organization, degrees of, 119. Flexibility of mind, 267. Flies, horned, 93. Flight of spiders, 65. Flounder, 37. Flower, Professor, 163, 232, 283. Fly, orchid, 55. Flying-dragon, 64, 158. Flying fish, 64. Foetal teeth of whales, 7. Food, effects on pigs, 99. Footsteps of Connecticut, 131. Foraminifera, 186. Formally moral acts, 195. Formation of eye and ear, 51. Forms, substantial, 186, 272. Four-gilled Cephalopods, 76. Fowls, white silk, 122. French theatrical audience, 198. Fresh-water fishes, 145. Frogs, Chilian and European, 149. Fuego, Terra del, 192. [Page 292]