INDEX 



development <rf the crop in, 313; 

 domestie, breeds and sub-breeds of, 

 593. 



Pigeons, nestling, led by the secretion 

 of the crop of botli parents, 218; 

 changes of plumage in, 302; trans- 

 mission of sexual peculiarities in, 

 303; Belgian, with black-streaked 

 males, 306, 313, 675; changing 

 color after several moultings, 313; 

 numerical proportion of the sexes 

 in, 325; cooing of, 486; variations 

 in plumage of, 498; display of plu- 

 mage by male, 619; local memory of, 

 630; antipathy of female, to certain 

 males, 639; pairing of, 639; profli- 

 gate male and female, 540; wing- 

 bars and tall-feathers of, 651; sup- 

 posititious breed of, 573 ; pouter and 

 carrier, peculiarities of, predominant 

 in males, 576; nidiflcation of, 684; 

 Australian, 591; immature plumage 

 of the, 602. 



Pigs, origin of the improved breeds of, 

 236; numerical proportion of the 

 sexes in, 324 ; stripes of young, 699, 

 705; tus]£S of miocene, 672; sexued 

 preference shown by, 677. 



Pike, American, brilliant colors of the 

 male, during the breeding season, 

 442. 



, reasoning powers of, 108; male, 



devoured by females, 328. 



Pike, L. 0., on the psychical elements 

 of religion, 133. 



Pimelia striata, sounds produced by the 

 female, 400. 



Pinel, striking case of hairiness in an 

 idiot, 69. 



Pintail, drake, plumage of, 608; pair- 

 ing with a wild duck, 536. 



duck, pairing with a widgeon, 



635. 



Pipe-flsh, filamentous, 447 ; marsupial 

 receptacles of the male, 460. 



Pipits, moulting of the, 606. 



Pipra, modified secondary wing-feath- 

 ers of male, 490. 



deliciosa, 490. 



Pirates stridulus, stridulation of, 370. 



Pitcaira Island, haU-breeds on, 253. 



Pithecia leucocephala, sexual differ- 

 ences of color in, 694. 



— — Satanas, beard of, 687; resem- 

 blance of, to a negro, 777. 



Pits, suborbital, of Buminanta, 684. 



Piltidss, nidiflcation of, 684. 



Placentata, 211. 



Plagiostomous fishes, 431. 



Plain-wanderer, Australian, 614. 



Planariae, bright colors of some, 345. 



Plantain-eaters, colors and nidiflcation 

 of the, 687; both sexes of, equally 

 brilliant, 693. 



Plants, cultivated, more fertile than 

 wild, 69; Nageli, on natural selec- 

 tion in, 88 ; male flowers of, maturo 

 before the female, 281; phenomena 

 of fertilization in, 293, 



Platalea, 485; change of plumage in, 

 695. 



Platyblemnus, 380. 



Platycercus, young of, 621. 



Platyphyllum concavum, 372, 376. 



Platyrrhine monkeys, 206. 



Platysma myoides, 30. 



Plecostomus, head-tentacles of the 

 males of a species of, 440. 



barbatus, peculiar beard of the 



male, 441. 



Plectropterus gambensis, spurred wings 

 of, 473. 



Ploceus, 480, 487, 523. 



Plovers, wing-spurs of, 475; double 

 moult in, 506. 



Plumage, changes of, inheritance o^ 

 by fowls, 301-302 ; tendency to anal- 

 ogous variation in, 498; display of, 

 by male birds, 509, 519; changes 

 of, in relation to season, 594 ; imma- 

 ture, of birds, 599-600; color of, in 

 relation to protection, 631. 



Plumes on the head in birds, difference 

 of, in the sexes, 581. 



Pneumora, structure of, 377. 



Podica, sexual difference in the color 

 of the irides of, 649. 



Poeppig, on the contact of civilized and 

 savage races, 240. 



Poison, avoidance of, by animals, 113. 



Poisonous fruits and herbs avoided by 

 animals, 96. 



Poisons, immunity from, correlated 

 with color, 256. 



Polish fowls, origin of the crest in, 

 304. 



Pollen and van Dam, on the colors of 

 Lemur macaco, 693. 



Polyandry, 763; in certain Cyprinidee^ 

 329 ; among the Elateridn, 336. 



