45^ 



Index. 



Protozoa, 104. 

 Ptarmigan, 317, 318. 

 Pterodactyl, wing of, 56. 

 Purpose, Darwin's use of the word, 



281, 340. 

 Puss moth, larva of, 325, 326. 

 Pytlion, 66, 67. 



Q. 



Quadrumann, mu?clesof, 76, 82, 83; 

 perforations of humeri of, 91, 

 95 ; hair on phalanges of, 91. 



R. 



Rabbit, embryology of, 153 ; mul- 

 tiplication of, in Australia, 286 ; 

 portraits ofwild and domesticated 

 breeds of, 30S ; protective colour- 

 ing of, 319, 320. 



Radiate form, beauty of, 40S, 409. 



Raia radiata, and batis, 367 371. 



Rats, species of, restricted to Old 

 and New Worlds, 212; Biitish 

 and Norwegian, 2S5, 286. 



Rattle-snake, tail of, 2 89. 



Recognition marks, 271-273. 



Religion, in relation to Darwinism, 

 401-418. 



Reproduction, different methods of, 

 106-117 J essence of sexual, no; 

 foreshadowing of sexual in uni- 

 cellular organisms, 115-117- 



Reptiles, wing of flying 56 ; rudi- 

 mentary limbs of, C'7; nictitating 

 membrane of, 75 ; branchial 

 arches of, 150; embryology of, 

 152 ; palseontology of, 163, 165, 

 178-180: brain of, 194-197; 

 distribution of 224-240. 



Rhinoceros, foot of, 186. 



Robinson, Dr. L., on grasping 

 power of aninfant'shands,8o-S2. 



Rudimentary organs, 65-97- 



Ruminants, palteontology of, 167, 

 16S. 



Sacrum of man, co spared with 



that of apes, 82-84. 

 Sagitta, 138. 

 Salamander, young of terrestrial, 



living in water, 102 ; embryo 



logy of, 152. 

 Sandwich Islands, 234-237. 

 Science, method of, i -9. 

 Sclater, W. L., on a case of 



mimicry, 331, 332. 

 Scorpion in Silurian formation, 



163. 

 Sea, lamprey. 148; destructive 



agency of the, 423, 424. 

 Seal, 51, 52, 75. 

 Seasonal changes of colour, 317- 



Selection, value, 275 ; by physical 

 processes, 282, 283, 335. See 

 also Natural selection. Artificial 

 selection. Sexual selection, Phy- 

 siological selection. 



Sentiency, in relation to the 

 theory of evolution, 417. 



Sex, difference of, lestricted to 

 Metazoa and Metaphyta, 105. 



Sexual reproduction, see Repro- 

 duction. 



Sexual selection, theory of, 277, 

 37S-410; statement and evi- 

 dences of, 379-.- 9 1 ; criticisms 

 of, 391-400; includes law of 

 battle with that of charming, 

 385. 386; in relation to religious 

 thought, 41 1-4 1 8 ; Tylor'stheory 

 substituted for, by Wallace, 449, 



45°- 



Shaik, eye of, 75 ; man-eating 

 149 ; and pilot-fish. 289. 



Sheep, limb-bones of, 176, 177; 

 portraits of 310. 



Shells, of crabs, 62-64 ; palaeon- 

 tology of moUufk's, 199-203 : 

 land on oceanic islands, 224- 

 240. 



Silliman's Journal, on fauna of the 

 Mammoth Cave, 70. 



Skate, electric organ of, 364-373. 



Skull, paleontology of, I94-Ui9; 

 of bull-dog compared with that 

 of deer-hound, 307. 



Slavonia, Tertiary deposits of, 

 18, 19. 



Species, not eternal, but either 

 created or evolved, 13 ; named 

 as such through absence ol 



