Pintail, drake, plumage of; pairing with a wild duck.
Pintail Duck, pairing with a widgeon.
Pipe-fish, filamentous; marsupial receptacles of the male.
Pipits, moulting of the.
Pipra, modified secondary wing-feathers of male.
Pipra deliciosa.
Pirates stridulus, stridulation of.
Pitcairn island, half-breeds on.
Pithecia leucocephala, sexual differences of colour in.
Pithecia Satanas, beard of; resemblance of, to a negro.
Pits, suborbital, of Ruminants.
Pittidae, nidification of.
Placentata.
Plagiostomous fishes.
Plain-wanderer, Australian.
Planariae, bright colours of some.
Plantain-eaters, colours and nidification of the; both sexes of,
equally brilliant.
Plants, cultivated, more fertile than wild; Nageli, on natural
selection in; male flowers of, mature before the female; phenomena of
fertilisation in.
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