INDEX. 



423 



©f, II. 71 *, display of plumage by male, ii. 

 92; local memory of, ii. 105; antipathy 

 of female, to certain males, ii. 114; pair- 

 ing of, ii. 115; profligate male and 

 female, ii. 114; wing-bars and tail-feath- 

 ers of, ii. 1'25 ; supposititious breed of, ii. 

 14S; pouter and carrier, peculiarities of 

 predominant in males, ii. 150; nidifica- 

 tion of, ii. 160 ; immature plumage of the, 

 ii. ISO; Australian, ii. 167; Belgian, with 

 black-streaked males, i. 2S5, 293 ; ii. 150. 



Pigs, origin of the improved breeds of, i. 

 222 ; numerical proportion of the sexes 

 in, i. 295 ; stripes of young, ii. 176, 288 ; 

 sexual preference shown by, ii. 260. 



Pike. American, brilliant colors of the 

 male, during the breeding-season, ii. 14. 



Pike, male, devoured by females, i. 299. 



Pike, L. O., on the psychical elements of 

 religion, i. 66. 



Pimelia striata, sounds produced by the 

 female, i. 373. 



Pintail Drake, plumage of, ii. 81 ; pairing 

 with a wild-duck, ii. 110. 



Pintail Duck, pairing with a "Widgeon, ii. 

 109. 



Pipe-fish,' filamentous, ii. 18; marsupial 

 receptacles of the male, ii. 20. 



Pipits, moulting of the, ii. 79. 



Pipra, modified secondary wing-feathers 

 of male, ii. 62. 



Pipra deliciosa, ii. 62, 63. 



Pirates stridulus, stridulation of, i. 340. 



Pithecia leucocephala, sexual differences 

 of color in, ii. 277. 



Pithecia Satanas, beard of, ii. 269, 272 ; 

 resemblance of, to a negro, ii. 365. 



Pits, suborbital, of Ruminants, ii. 267. 



Pittid.e, nidification of, ii. 160. 



Placentata, i. 194. 



Plagiostomous fishes, ii. 1. 



Plain-wanderer, Australian, ii. 192. 



Pkinarice, bright colors of some, i. 313. 



Plantain-eaters, colors and nidification 

 of the. ii. 163; both sexes of, equally 

 brilliant, ii. 169. 



Plants, cultivated, more fertile than wild, 

 i. 127 ; Nageli, on natural selection in, i. 

 •146; male flowers of, mature before the 

 female, i. 252 ; phenomena of fertilization 

 in, i. 265 ; relation between number and 

 size of seeds in, i. 309. 



Platalea, ii. 57 ; change of plumage in, ii. 

 171. 



Platyblemnus, i. 350. 



Platycercus, 3'oung of, ii. 200. 



Platypliyllmn coneavwm, i. 342, 345. 



Platyrrhine monkeys, i. 188. 



Platysma myoides, i. 19. 



Plecoslomus, head-tentacles of the male of 

 a species of, ii. 10. 



Plecostomus barbatus, peculiar beard of 

 the male, ii. 10. 



Plectropterus gambensis, spurred wings 

 of, ii. 44. 



Ploceus, ii. 52. 



Plovers, wing-spurs of, ii. 44; double 

 moult in, ii. 79. 



Plumage, changes of, inheritance of, by 

 fowls, i. 272; tendency to analogous 

 variation in, ii. 70 ; display of, by malo 

 birds, ii. 82, 92 ; changes of, in relation to 

 season, ii. 172; immature, of birds, ii. 

 175, 179; color of, in relation to protec- 

 ' tion, ii. 213. 



Plumes on the head in birds, difference of, 

 in the sexes, ii. 156. 



Pnewnora, structure of, i. 346. 



Podica, sexual difference in the color of 

 the irides of, ii. 123. 



Poeppig, on the contact of civilized and 

 savage races, i. 230. 



Poison, avoidance of, by animals, i. 48. 



Poisonous fruits and herbs avoided by 

 animals, i. 35. 



Poisons, immunity from, correlated with 

 color, i. 233. 



Polish fowls, origin of the crest in, i. 275. 



Pollen and Van Dam, on the colors of Le~ 

 mur macaco, ii. 276. 



Polyandry, ii. 349 ; in certain cyprinidae, 

 i. 306; among the elaterida?, i. 305. 



Polydactylism in man, i. 120. 



Polygamy, influence of, upon sexual selec- 

 tion, i. 257; superinduced by domesti- 

 cation, i. 262 ; supposed increase of fe- 

 male births by, i. 293 ; in the stickleback, 

 ii. 2. 



POLYGENISTS, i. 220. 



Polynesia, prevalence of infanticide in, ii. 



347. 

 Polynesians, aversion of, to hairs on the 



face, ii, 332 ; wide geographical range of, 



i. 108 ; difference of stature among the, i. 



110 ; crosses of, i. 217 ; variability of, i. 



217; heterogeneity.of the, i. 232. 

 Polyplectron, display of plumage by the 



male, ii. S6 ; number of spurs in, ii. 43 ; 



gradation of characters in, ii. 131 ; female 



of, ii. 185. 

 Polyplectron, chinquis, ii. 86. 132, 133. 

 Polyplectron HardwicMi, ii. 132, 133. 

 Polyplectron Malaccense, ii. 133, 134. 

 Polyplectron Napoleonw, ii. 132, 134. 

 Polyzoa, i. 315. 

 Pontoporeia affinis, i. 319. 

 Porcupine, mute, except in the rutting- 



season, ii. 261. 

 Pores, excretory, numerical relation of, to 



the hairs in sheep, i. 239. 

 Porpitce, bright colors of some, i. 313. 

 Portaxpicta, dorsal crest and throat- tuft 



of. ii. 268 ; sexual differences of color in, 



ii. 274. 2s(i. 

 Portunus puber, pugnacity of, i. 323. 

 Potamocltoerus penicillatus, tusks and 



facial knobs of the. ii. 254. 

 Pouchet. £>., on the ratio of instinct and 



intelligence, i. 36; on the instincts of 



ants, i. ISO; on the ca''"« of Abou-Sim- 



bel, i. 209 ; on the immunity of negroes 



from yellow fever, i 234. 

 Pouter pigeon, late development of the 



large crop in, i. 284. 

 Power, Dr., on the different colors of tb« 



sexes in a species of Squilla, i. 826. 



