Page:Descent of Man 1875.djvu/637

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* Agrion Ramburii, sexes of, 290.
 * Agrionidæ, difference in the sexes of, 290.
 * Agrotis exclamationis, 316.
 * Ague, tertian, dog suffering from, 8.
 * Aïthurus polytmus, young of, 487.
 * Ainos, hairiness of the, 560.
 * Albino birds, 419.
 * Alca torda, young of, 486.
 * Alces palmata, 515.
 * Alder and Hancock, MM., on the nudi-branch mollusca, 264.
 * Allen, J. A., vigour of birds earliest hatched, 212, 213; effect of difference of temperature, light, &c., on birds, 225; colours of birds, 422; on the relative size of the sexes of Callorhinus ursinus, 515; on the mane of Otaria jubata, 521; on the pairing of seals, 523; on sexual differences in the colour of bats, 534.
 * S., on the habits of Hoplopterus, 366; on the plumes of herons, 391; on the vernal moult of Herodias bubulcus, 393.
 * Alligator, courtship of the male, 221, 351; roaring of the male, 567.
 * Amadavat, pugnacity of male, 366.
 * Amadina Lathami, display of plumage by the male, 402.
 * castanotis, display of plumage by the male, 402.
 * Amazons, butterflies of the, 250; fishes of the, 343.
 * America, variation in the skulls of aborigines of, 26; wide range of aborigines of, 169; lice of the natives of, 170; general beardlessness of the natives of, 560.
 * , North, butterflies of, 250; Indians of, women a cause of strife among the, 561; Indians of, their notions of female beauty, 577, 580.
 * , South, character of the natives of, 168; population of parts of, 173; piles of stones in, 179; extinction of the fossil horse of, 191; desert-birds of, 490; slight sexual difference of the aborigines of, 561; prevalence of infanticide in, 592.
 * American languages, often highly artificial, 91.
 * Americans, wide geographical range of, 29; native, variability of, 174; and negroes, difference of, 197; aversion of, to hair on the face, 580.
 * Ammophila, on the jaws of, 275.
 * Ammotragus tragelaphus, hairy forelegs of, 531, 533.
 * Amphibia, affinity of, to the ganoid fishes, 159; vocal organs of the, 566.
 * Amphibians, 165, 348; breeding whilst immature, 485.
 * Amphioxus, 159.
 * Amphipoda, males sexually mature while young, 485.
 * Amunoph III., negro character of features of, 168.
 * Anal appendages of insects, 275.
 * Analogous variation in the plumage of birds, 385.
 * Anas, 462.
 * acuta, male plumage of, 393.
 * boschas, male plumage of, 393.
 * histrionica, 484.
 * punctata, 374.
 * Anastomus oscitans, sexes and young of, 486; white nuptial plumage of, 492.
 * Anatidæ, voices of, 374.
 * Anax junius, differences in the sexes of, 290.
 * Andaman islanders, susceptible to change of climate, 188.
 * Anderson, Dr., on the tail of Macacus brunneus, 59; the Bufo sikimmensis, 349; sounds of Echis carinata, 353.
 * Andrœna fulva, 292.
 * Anglo-Saxons, estimation of the beard among the, 581.
 * Animals, domesticated, more fertile than wild, 45; cruelty of savages to, 118; characters common to man and, 146; domestic, change of breeds of, 596.
 * Annelida, 264; colours of, 265.
 * Anobium tessellatum, sounds produced by, 306.
 * Anolis cristatellus, male, crest of, 354; pugnacity of the male, 354; throatpouch of, 354.
 * Anser canadensis, 416.
 * cygnoides, 415; knob at the base of the beak of, 426.
 * hyperboreus, whiteness of, 492.
 * Antelope, prong-horned, horns of, 234.