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.
Birkbeck, Mr., on the finding of new mates by golden eagles.
Birthplace of man.
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