Arakhan.
Primary sexual organs.
Primates, sexual differences of colour in.
Primogeniture, evils of.
Prionidae, difference of the sexes in colour.
Proctotretus multimaculatus.
Proctotretus tenuis, sexual difference in the colour of.
Profligacy.
Progenitors, early, of man.
Progress, not the normal rule in human society; elements of.
Prong-horn antelope, horns of.
Proportions, difference of, in distinct races.
Protective colouring in butterflies; in lizards; in birds; in mammals.
Protective nature of the dull colouring of female Lepidoptera.
Protective resemblances in fishes.
Protozoa, absence of secondary sexual characters in.
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
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