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pigs.
INDEX.
polygamy.
669
of the crop of both parents, 163; changes of plumage in, 229; transmission 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 memory 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; nidification 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.
- Pike, American, brilliant colours of the male, during the breeding season, 340.
- , reasoning powers of, 75; male, devoured by females, 249.
- Pike, L. O., on the psychical elements of religion, 95.
- Pimelia 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; marsupial 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.
- Pithecia leucocephala, sexual differences of colour in, 537.
- Satanas, beard of, 531, 532; resemblance of, to a negro, 604.
- Pits, suborbital, of Ruminants, 529.
- Pittidæ, nidification of, 453.
- Placentata, 157.
- Plagiostomous fishes, 331.
- Plain-wanderer, Australian, 473.
- Planariœ, bright colours of some, 260.
- Plantain-eaters, colours and nidification of the, 455; both sexes of, equally brilliant, 460.
- Plants, cultivated, more fertile than wild, 45; Nägeli, on natural selection in, 61; male flowers of, mature before the female, 212; phenomena of fertilisation in 222.
- Platalea, 374; change of plumage in, 461.
- Platyblemnus, 289.
- Platycercus, young of, 481.
- Platyphyllum concavum, 283, 286.
- Platyrrhine monkeys, 153.
- Platysma myoides, 13.
- Plecostomus, head-tentacles of the males of a species of, 338.
- barbatus, peculiar beard of the male, 338.
- Plectropterus gambensis, spurred wings of, 364.
- Ploceus, 370, 375, 405.
- Plovers, wing-spurs of, 365; double moult in, 392.
- Plumage, changes of, inheritance of, by fowls, 229; tendency to analogous variation in, 385; display of, by male birds, 394, 402; changes of, in relation to season, 462; immature, of birds, 464, 465; colour of, in relation to protection, 489.
- Plumes on the head in birds, difference of, in the sexes, 451.
- Pneumora, structure of, 286.
- Podica, sexual difference in the colour 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 Cyprinidæ, 249; among the Elateridæ, 253.
- Polydactylism in man, 37.
- Polygamy, influence of, upon sexual selection, 216; superinduced by