Batrachia, eagerness of male.
Bats, scent-glands; sexual differences in the colour of; fur of male frugivorous.
Battle, law of; among beetles; among birds; among mammals; in man.
Beak, sexual difference in the forms of the; in the colour of the.
Beaks, of birds, bright colours of.
Beard, development of, in man; analogy of the, in man and the quadrumana; variation of the development of the, in different races of men; estimation of, among bearded nations; probable origin of the.
Beard, in monkeys; of mammals.
Beautiful, taste for the, in birds; in the quadrumana.
Beauty, sense of, in animals; appreciation of, by birds; influence of; variability of the standard of.
Beauty, sense of, sufficiently permanent for action of sexual selection.
Beaven, Lieut., on the development of the horns in Cervus Eldi.
Beaver, instinct and intelligence of the; voice of the; castoreum of the.
Beavers, battles of male.
Bechstein, on female birds choosing the best singers among the males; on rivalry in song-birds; on the singing of female birds; on birds acquiring the songs of other birds; on pairing the canary and siskin; on a sub-variety of the monk pigeon; on spurred hens.
Beddoe, Dr., on causes of difference in stature.
Bee-eater.
Bees, pollen-baskets and stings of; destruction of drones and queens by; female, secondary sexual characters of; proportion of sexes; difference of the sexes in colour and sexual selection.
Beetle, luminous larva of a.
Beetles, size of the cerebral ganglia in; dilatation of the foretarsi in male; blind; stridulation of.
Belgium, ancient inhabitants of.
Bell, Sir C., on emotional muscles in man; "snarling muscles;" on the hand.
Bell, T., on the numerical proportion of the sexes in moles; on the newts; on the croaking of the frog; on the difference in the coloration of the sexes in Zootoca vivipara; on moles fighting.
Bell-bird, sexual difference in the colour of the.
Bell-birds, colours of.
Belt, Mr., on the nakedness of tropical mankind; on a spider-monkey and eagle; habits of ants; Lampridae distasteful to mammals; mimicry of Leptalides; colours of Nicaraguan frogs; display of humming-birds; on the toucans; protective colouring of skunk.
Benevolence, manifested by birds.
Bennett, A.W., attachment of mated birds; on the habits of Dromaeus irroratus.
Bennett, Dr., on birds of paradise.
Berbers, fertility of crosses with other races.
Bernicla antarctica, colours of.
Bernicle gander pairing with a Canada goose.
Bert, M., crustaceans distinguish colours.
Bettoni, E., on local differences in the nests of Italian birds.
Beyle, M., see Bombet.
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.