386 



INDEX 



Radiates, 89, 111. 



Reason, 264. 



Recapitulation, 330. 



Reconciliation, 315. 



Reptilia, 112, 123. 



Retina, 168. 



Revelations, 319. 



Retrograde metamor- 

 phosis, 357. 



Retrogressive, 363. 



Rhinoceros, 134. 



Rhizopods. 89. 



Rodentia, 112, 121, 134. 



Roemer, 91. 



Romanes, 77, 91, 125, 

 141, 155, 163, 165, 170, 

 171, 344. 



Royal jelly, 206. 



Rudimentary legs,193. 



Rudimentary organs, 

 182, 296. 



Rudimentary teeth, 

 192. 



Ruminant, 112. 



Salamander, 114. 

 Sauropsida, 161. 

 Sauropus, 160. 

 Scorpions, 110, 169, 



179. 

 Scaphaspis, 118. 

 Science and. Religion, 



317. 

 Sea-horse, 219. 

 Sea-urchins, 111. 

 Sexual selection, 196. 

 Sexual differences, 195. 

 Seasons, 276. 

 Shaler, 49, 50. 

 Silurian, 93. 

 Simiidaa, 365. 

 Sirenia, 362. 

 Skates, 155. 

 Skulls, 230, 366. 

 Sound, 32. 

 Soap bubble, 16, 20. 

 Snakes, 180. 

 Sodium, 280. 

 Sodium flame, 16. 

 Space, 312. 

 Sperm, 205. 

 Spermatozoa, 142. 

 Species, number of, 49. 



Special act, 58. 



Special objections, 

 153. 



Special senses, 247. 



Spectrum, 15, 35. 



Spencer, 52, 166, 244, 

 248, 251, 252, 311, 312, 

 315, 320, 323, 324. 



Spike-horn buck, 198. 



Spinnarets, 222. 



Sphagodus, 118. 



Spiders, 110, 168. 



Sponges, 105, 113. 



Spontaneous genera- 

 tion, 57, 355. 



Spurs, 190. 



Spy, man of, 366. 



Squalodon, 137. 



Sternum, 161. 



Stars, 34. 



Star-fishes, 111, 169. 



Stings, 179. 



Sting-ray, 224. 



Suffering, 302. 



Sulphur, 280. 



Sun's heat, 273. 



Surinam toad, 218. 



Swarming of bees, 206. 



Table of geological 



ages, 86. 

 Tapirus, 134. 

 Tasmanians, 233. 

 Teeth, origin of, 379. 

 Teleology, 12. 

 Terebratula, 114. 

 Tertiary, 95, 105, 134. 

 Temperature, 14. 

 Theism, 11, 12, 34. 

 Theist, 11. 

 Theromerous, 36r. 

 Teutonic, 233. 

 Terra del Fuegians, 



235 

 Thelodus, 118. 

 Thomson, Sir Wm., 



17, 39, 41, 44, 45, 273. 

 Thompson, Wyville, 



113. 

 Time, 312. 

 Tongue - and - groove 



joint, 380. 

 Torpedo, 155. 



Tortrices, 193. 

 Triassic, 113, 122, 129, 



131. 

 Tracheal, 178. 

 Trenton, 119. 

 Trilobites, 89, 90, 107, 



108. 

 Trinyl, 368. 

 Triton, 114. 

 Tunicata, 169. 

 Tyndall, 60. 

 Types, 111. 



Ungulates, 121, 133. 

 Units of feeling, 249. 

 Unknowable, 52. 



Vacant spaces, 19. 



Vertebras, origin of, 

 379. 



Vesiculse prostrati- 

 cas, 186. 



Vibrations, 35. 



Virchow, 235. 



Volume, loss by cool- 

 ing, 20. 



Wallace, 231, 265. 

 Water-flea, 168. 

 Water-spider, 220. 

 Wax, 204. 

 Wadsworth, 91. 

 Waves, 32. 

 Wasatch, 133. 

 Webs, 179. 

 Wealden, 130. 

 Weights of atoms, 24. 

 Whales, 134, 137. 

 Whitney, 91. 

 Will, 264. 

 Wings, 156, 157, 164, 



165. 

 Worms, 89. 

 Wood, J. G., 218. 

 Wrist, origin of, 378. 

 Wyoming, 131. 



Zero, absolute, 19. 

 Zeuglodon, 135, 136. 

 Zittel, 91. 



