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* Eagles, golden, new mates found by, 408.
 * Ear, motion of the, 13; external shell of the, useless in man, 14; rudimentary point of the, in man, 15.
 * Ears, more variable in men than women, 224; piercing and ornamentation of the, 575.
 * Earwigs, parental feeling in, 106.
 * Echidna, 156.
 * Echini, bright colours of some, 260.
 * Echinodermata, absence of secondary sexual characters in, 260.
 * Echis carinata, 353.
 * Ecker, figure of the human embryo, 10; on the development of the gyri and sulci of the brain, 204; on the sexual differences in the pelvis in man, 557; on the presence of a sagittal crest in Australians, 558.
 * Edentata, former wide range of, in America, 169; absence of secondary sexual characters in, 218.
 * Edolius, racket-shaped feathers in, 384.
 * Edwards. Mr., on the proportion of the sexes in North American species of Papilio, 250.
 * Eels, hermaphroditism of, 162.
 * Egerton, Sir P., on the use of the antlers of deer, 510; on the pairing of red deer, 522; on the bellowing of stags, 526.
 * Eggs, hatched by male fishes, 345.
 * Egret, Indian, sexes and young of, 486.
 * Egrets, breeding plumage of, 391; white, 492.
 * Ehrenberg, on the mane of the male Hamadryas baboon, 521.
 * Ekström, M., on Harelda glacialis, 420.
 * Elachista rufocinerea, habits of male, 252.
 * Eland, development of the horns of the, 234.
 * Elands, sexual differences of colour in 535
 * Elaphomyia, sexual differences in, 280.
 * Elaphrus uliginosus, stridulation of, 302.
 * Elaps, 353.
 * Elateridæ, proportions of the sexes in, 253.
 * Elaters, luminous, 278.
 * Elephant, 156; rate of increase of the, 47; nakedness of the, 57; Indian, forbearance to his keeper, 104; polygamous habits of the, 218; pugnacity of the male, 501; tusks of, 502, 503, 507, 515; Indian, mode of fighting of the, 513; male, odour emitted by the, 529; attacking white or grey horses, 540.
 * Elevation of abode, modifying influence of, 35.
 * Elimination of inferior individuals, 137.
 * Elk, 507; winter change of the, 542.
 * , Irish, horns of the, 515.
 * Ellice Islands, beards of the natives, 560, 581.
 * Elliot, R., on the numerical proportion of the sexes in young rats, 247; on the proportion of the sexes in sheep, 246.
 * , D. G., on Pelecanus erythrorhynchus, 390.
 * , Sir W., on the polygamous habits of the Indian wild boar, 218.
 * Ellis, on the prevalence of infanticide in Polynesia, 592.
 * Elphinstone, Mr., on local differences of stature among the Hindoos, 31; on the difficulty of distinguishing the native races of India, 167.
 * Elytra, of the females of Dytiscus, Acilius, Hydroporus, 276.
 * Emberiza, characters of young, 464.
 * miliaria, 464.
 * schœniclus, 412; head-feathers of the male, 402.
 * Embryo of man, 9, 10; of the dog, 10.
 * Embryos of mammals, resemblance of the, 25.
 * Emigration, 137.
 * Emotions experienced by the lower animals in common with man, 69; manifested by animals, 71.
 * Emperor moth, 315.
 * Emulation of singing-birds, 369.
 * Emu, sexes and incubation of, 478.
 * Endurance, estimation of, 118.
 * Energy, a characteristic of men, 565.
 * England, numerical proportion of male and female births in, 242.
 * Engleheart, Mr., on the finding of new mates by starlings, 408.