Douglas, J.W., on the sexual differences of the Hemiptera; colours of British Homoptera.
Down, of birds.
Draco, gular appendages of.
Dragonet, Gemmeous.
Dragon-flies, caudal appendages of male; relative size of the sexes of; difference in the sexes of; want of pugnacity by the male.
Drake, breeding plumage of the.
Dreams, possible source of the belief in spiritual agencies.
Drill, sexual difference of colour in the.
Dromaeus irroratus.
Dromolaea, Saharan species of.
Drongo shrike.
Drongos, racket-shaped feathers in the tails of.
Dryness of climate, supposed influence of, on the colour of the skin.
Dryopithecus.
Duck, harlequin, age of mature plumage in the; breeding in immature plumage.
Duck, long-tailed, preference of male, for certain females.
Duck, pintail, pairing with a widgeon.
Duck, voice of the; pairing with a shield-drake; immature plumage of the.
Duck, wild, sexual differences in the; speculum and male characters of; pairing with a pin-tail drake.
Ducks, wild, becoming polygamous under partial domestication; dogs and cats recognised by.
Dufosse, Dr., sounds produced by fish.
Dugong, nakedness of; tusks of.
Dujardin, on the relative size of the cerebral ganglia, in insects.
Duncan, Dr., on the fertility of early marriages; comparative health of married and single.
Dupont, M., on the occurrence of the supra-condyloid foramen in the humerus of man.
Durand, J.P., on causes of variation.
Dureau de la Malle, on the songs of birds; on the acquisition of an air by blackbirds.
Dutch, retention of their colour by the, in South Africa.
Duty, sense of.
Duvaucel, female Hylobates washing her young.
Dyaks, pride of, in mere homicide.
Dynastes, large size of males of.
Dynastini, stridulation of.
Dytiscus, dimorphism of females of; grooved elytra of the female.
Eagle, young Cercopithecus rescued from, by the troop.
Eagle, white-headed, breeding in immature plumage.
Eagles, golden, new mates found by.
Ear, motion of the; external shell of the, useless in man; rudimentary point of the, in man.
Ears, more variable in men than women; piercing and ornamentation of the.
Earwigs, parental feeling in.
Echidna.
Echini, bright colours of some.
Echinodermata, absence of secondary sexual characters in.
Echis carinata.
Ecker, figure of the human embryo; on the development of the gyri and sulci of the brain; on the sexual differences in the pelvis in man; on the presence of a sagittal crest in Australians.
Edentata, former wide range of, in America; absence of secondary sexual characters in.
Edolius, racket-shaped feathers in.
Edwards, Mr., on the proportion of the sexes in North American species of Papilio.
Eels, hermaphroditism of.
Egerton, Sir P., on the use of the antlers of deer; on the pairing of red deer; on the bellowing of stags.
Eggs, hatched by male fishes.
Egret, Indian, sexes and young of.
Egrets, breeding plumage of; white.
Ehrenberg, on the mane of the male Hamadryas baboon.
Ekstrom, M., on Harelda glacialis.
Elachista rufocinerea, habits of male.
Eland, development of the horns of the.
Elands, sexual differences of colour in.
Elaphomyia, sexual differences in.
Elaphrus uliginosus, stridulation of.
Elaps.
Elateridae, proportion of the sexes in.
Elaters, luminous.
Elephant, rate of increase of the; nakedness of the; using a fan; Indian, forbearance to his keeper; polygamous habits of the; pugnacity of the male; tusks of; Indian, mode of fighting of the; male, odour emitted by the; attacking white or grey horses.
Elevation of abode, modifying influence of.
Elimination of inferior individuals.
Elk, winter change of the.
Elk, Irish, horns of the.
Ellice Islands, beards of the natives.
Elliot, D.G., on Pelecanus erythrorhynchus.
Elliot, R., on the numerical proportion of the sexes in young rats; on the proportion of the sexes in sheep.
Elliot, Sir W., on the polygamous habits of the Indian wild boar.