Bhoteas, colour of the beard in.
Bhringa, disc-formed tail-feathers of.
Bianconi, Prof., on structures as explained through mechanical principles.
Bibio, sexual differences in the genus.
Bichat, on beauty.
Bickes, proportion of sexes in man.
Bile, coloured, in many animals.
Bimana.
Birds, imitations of the songs of other birds by; dreaming; killed by telegraph wires; language of; sense of beauty in; pleasure of, in incubation; male, incubation by; and reptiles, alliance of; sexual differences in the beak of some; migratory, arrival of the male before the female; apparent relation between polygamy and marked sexual differences in; monogamous, becoming polygamous under domestication; eagerness of male in pursuit of the female; wild, numerical proportion of the sexes in; secondary sexual characters of; difference of size in the sexes of; fights of male, witnessed by females; display of male, to captivate the females; close attention of, to the songs of others; acquiring the song of their foster-parents; brilliant, rarely good songsters; love-antics and dances of; coloration of; moulting of; unpaired; male, singing out of season; mutual affection of; in confinement, distinguish persons; hybrid, production of; Albino; European, number of species of; variability of; geographical distribution of colouring; gradation of secondary sexual characters in; obscurely coloured, building concealed nests; young female, acquiring male characters; breeding in immature plumage; moulting of; aquatic, frequency of white plumage in; vocal courtship of; naked skin of the head and neck in.
Birgus latro, habits of.