Pruner-Bey, on the occurrence of the supra-condyloid foramen in the humerus of man; on the colour of negro infants.
Prussia, numerical proportion of male and female births in.
Psocus, proportions of the sexes in.
Ptarmigan, monogamous; summer and winter plumage of the; nuptial assemblages of; triple moult of the; protective coloration of.
Puff-birds, colours and nidification of the.
Pugnacity of fine-plumaged male birds.
Pumas, stripes of young.
Puppies learning from cats to clean their faces.
Pycnonotus haemorrhous, pugnacity of the male; display of under-tail coverts by the male.
Pyranga aestiva, male aiding in incubation; male characters in female of.