INDEX. 



POLVQAMY. 



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 ofj 411 ; antipathy of female, 

 to certain males, 418 ; pairing of, 

 418; pro6igate male and female, 

 418 ; wing-bars and tail-feathers 

 of, 427 ; suppositious breed of, 445 ; 

 jtouter and carrier, peculiai-ities of, 

 predominant in males, 447 ; nidi- 

 lication 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'il-'i, American, brilliant colours of 

 the male, during the breeding 

 season, 340. 



, reasoning powers of, 75 ; male, 



devoured hj females, 249. 



Pike, L. 0., on the psychical elements 

 of religion, 95. 



Pimelia striata, sounds produced by 

 the female, 306. 



Pine!, 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. 



I'ipra, modified secondary wing- 

 teathers of male, 378. 



deliciosa, 378, 379. 



Pirates stridulus, stridulation of, 281. 



Pitcairn island, half-breeds on, 190., 



Pitlwcia leucocephala, sexual ditfer- 

 euces of colour in, 537. 



■^— Satanas, beard of, 531, 532 ; 

 resemblance of, to a negro, 604. 



Pits, suborbital, of Ruminants, 529. 



Pittidae, nidification of, 453. 



Placentata, 157. 



Plagiostomous fishes, 331. 



^Iain-wan lerer, Australian, 473. 



Planaria, 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 ; Nageli, 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. 



Platyblemmis, 289. 



Platycercus, young of, 481. 



Platyphyltum concavum, 283, 286. 



Platyrrhine monkeys, 153. 



Plati/sma myaides, 13. 



Plecostomus, head-tentacles of the 

 males of a species of, 338. 



barbatus, peculiar beard of the 



male, 338. 



Plectropterus gambensis, spurred wing» 

 of, 364. 



Ploceus, 370, 375, 405. 



Plovers, wing-spurs of, 365 ; double 

 moult in, 392. 



Plumage, changes of, inheritance of, 

 by fowls, 22J; tendency to ana- 

 logous variation in, 385 ; display 

 of, by male birds, 394, 402 ; changes 

 of, in relation to seaiion,' 462 ; im- 

 mature, of birds, 464, 465 ; colour 

 of, in relation to protection, 489. 



Plumes on the head in birds, diti'er- 

 ence of, in the sexes, 451. 



Pneumora, structure of, 286. 



Podica, sexual difference in the coloui 

 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 colour, 193. 



Polish fowls, origin of the crest in, 

 231. 



Pollen and van Dam, on the colours 

 of, Lemur macaco, 537. 



Polyandry, 593 ; in certain Cypri- 

 nida;, 249 ; among the t-laterida;, 

 253. 



Polydactylism in man, 37. 



Polygamy, influence of, upon sexual 

 selection, 216 ; superinduced by 



