Page:Descent of Man 1875.djvu/636




 * Abbot, C., on the battles of seals, 500.
 * Abductor of the fifth metatarsal, presence of, in man, 42.
 * Abercrombie, Dr., on disease of the brain affecting speech, 88.
 * Abipones, marriage customs of the, 598.
 * Abou-Simbel, caves of, 168.
 * Abortion, prevalence of the practice of, 46.
 * Abstraction, power of, in animals, 83.
 * Acalles, stridulation of, 306.
 * Acanthodactylus capensis, sexual differences of colour in, 357.
 * Accentor modularis, 473.
 * Acclimatisation, difference of, in different races of men, 167.
 * Achetidæ, stridulation of the, 282, 283, 285; rudimentary stridulating organs in female, 288.
 * Acilius sulcatus, elytra of the female, 276.
 * Acomus, development of spurs in the female of, 450.
 * Acridiidæ stridulation of the, 282, 286; rudimentary stridulating organs in female, 288.
 * Acromio-basilar muscle, and quadrupedal gait, 42.
 * Acting, 178.
 * Actiniœ, bright colours of, 260.
 * Adams, Mr., migration of birds, 108; intelligence of nut-hatch, 418; on the Bombycilla carolinensis, 461.
 * Admiral butterfly, 312.
 * Adoption of the young of other animals by female monkeys, 70.
 * Advancement in the organic scale, Von Baer's definition of, 164.
 * Aeby, on the difference between the skulls of man and the quadrumana, 149.
 * Æsthetic faculty, not highly developed in savages, 93.
 * Affection, maternal, 70; manifestation of, by animals, 70; parental and filial, partly the result of natural selection, 105; mutual, of birds, 410; shewn by birds in confinement, for certain persons, 411.
 * Africa, probably the birthplace of man, 155; South, crossed population of, 174; South, retention of colour by the Dutch in, 193; South, proportion of the sexes in the butterflies of, 250; tattooing practised in, 574; Northern, coiffure of natives of, 575.
 * Agassiz, L., on conscience in dogs, 103; on the coincidence of the races of man with zoological provinces, 169; on the number of species of man, 174; on the courtship of the land-snails, 262; on the brightness of the colours of male fishes during the breeding season, 340; on the frontal protuberance of the males of Geophagus and Cichla, 340, 345; male fishes hatching ova in their mouths, 345; sexual differences in colour of chromids, 345; on the slight sexual differences of the South Americans, 561; on the tattooing of the Amazonian Indians, 576.
 * Age, in relation to the transmission of characters in birds, 463; variation in accordance with, in birds, 484.
 * Agelœus phœniceus, 225, 416.
 * Ageronia feronia, noise produced by, 307.
 * Agrion, dimorphism in, 290.