tigs. 



INDEX. 



POLYGAMY. 



669 



&f the crop of both parents, 163 ; 

 changes of plumage in, 229 ; trans- 

 mission of sexual peculiarities in, 

 230 ; Belgian, with black-streaked 

 males, 231, 238, 446 ; changing 

 colour after several moultings, 238 ; 

 numerical proportion of the sexes 

 in, 247 ; cooing of, 374 ; variations 

 in plumage of, 385 ; display of 

 plumage by male, 402 ; local me- 

 mory of, 411 ; antipathy of female, 

 to certain males, 418 ; pairing of, 

 418; profligate male and female, 

 418 ; wing-bars and tail-feathers 

 of, 427 ; suppositious breed of, 445 ; 

 pouter and carrier, peculiarities of, 

 predominant in males, 447 ; nidi- 

 fication of, 453; Australian, 458; 

 immature plumage of the, 467. 



Pigs, origin of the improved breeds 

 of, 177 ; numerical proportion of 

 the sexes in, 247 ; stripes of young, 

 464, 546 ; tusks of miocene, 521 ; 

 sexual preference shewn by, 525. 



E'iH, American, brilliant colours of 

 the male, during the breeding 

 season, 340. 



, reasoning powers of, 75 ; male, 



devoured by females, 249. 



Pike, L. 0., on the psychical elements 

 of religion, 95. 



Pimella striata, sounds produced by 

 the female, 306. 



Pinel, hairiness in idiots, 36. 



Pintail, drake, plumage of, 393 ; 

 pairing with a wild duck, 415. 



Duck, pairing with a wigeon, 



414. 



Pipe-fish, filamentous, 344 ; mar- 

 supial receptacles of the male, 346. 



Pipits, moulting of the, 392. 



Pipra, modified secondary wing- 

 feathers of male, 378. 



deliciosa, 378, 379. 



Pirates stridulus, stridulation of, 281. 



Pitcairn island, half-breeds on, 190. 



Pithccia leucocephala, sexual differ- 

 ences of colour in, 537. 



— — Satanas, beard of, 531, 532 ; 

 resemblance of, to a negro, 604. 



Pits, suborbital, of Ruminants, 529. 



Pittidse, nidification of, 453. 



Placentata, 157. 



Plagiostomous fishes, 331. 



p lain-wan lerer, Australian, 473. 



Planarice, bright colours of some, 

 260. 



Plantain-eaters, colours and nidi- 

 fication of the, 455 ; both sexes of, 

 equally brilliant, 460. 



Plants, cultivated, more fertile than 

 wild, 45 ; Niigeli, on natural selec- 

 tion in, 61 ; male flowers of, mature 

 before the female, 212 ; phenomena 

 of fertilisation in 222. 



Platalea, 374 ; change of plumage in, 

 461. 



Platyblemnus, 289. 



Platyccrcus, young of, 481. 



Platypliyllum concavum, 283, 286. 



Platyrrhine monkeys, 153. 



Platysma myoides, 13. 



Plecostumus, head-tentacles of the 

 males of a species of, 338. 



barbatus, peculiar beard of the 



male, 338. 



Fleet ropterus yambensis, spurred wing« 

 of, 364. 



Ploceus, 370, 375, 405. 



Plovers, wing-spurs of, 365 ; double 

 moult in, 392. 



Plumage, changes of, inheritance of, 

 by fowls, 22,); tendency to ana- 

 logous variation in, 385 ; display 

 of, by male birds, 394, 402 ; changes 

 of, in relation to season, 462 ; im- 

 mature, of birds, 464, 465 ; colour 

 of, in relation to protection, 489. 



Plumes on the head in birds, differ- 

 ence of, in the sexes, 451. 



Pneumora, structure of, 286. 



Podica, sexual difference in the coloai 

 of the irides of, 425. 



Poeppig, on the contact of civilised 

 and savage races, 183. 



Poison, avoidance of, by animals, 80 



Poisonous fruits and herbs avoided by 

 animals, 66. 



Poisons, immunity from, correlated 

 with colou: , 193. 



Polish fOwls, origin of the crest in, 

 231. 



Pollen and van Dam, on the colours 

 of, Lemur macaco, 537. 



Polyandry, 59.J ; in certain Cypri- 

 nidae, 249 ; among the bJateride, 

 253. 



Polydactylism in man, 37. 



Polygamy, influence of, upon sexual 

 selection, 216 ; superinduced bj 



