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BIRGUS.
INDEX.
BLYTH.
627

frequency of white plumage in, 493; vocal courtship of, 567; naked skin of the head and neck in, 601.

  • Birgus latro, habits of, 270.
  • Birkbeck, Mr., on the finding of new mates by golden eagles, 408.
  • Birthplace of man, 155.
  • Births, numerical proportions of the sexes in, in animals and man, 215, 216; male and female, numerical proportion of, in England, 242.
  • Bischoff, Prof., on the agreement between the brains of man and of the orang, 6; figure of the embryo of the dog, 10; on the convolutions of the brain in the human fœtus, 11; on the difference between the skulls of man and the quadrumana, 149; resemblance between the ape's and man's, 200.
  • Bishop, J., on the vocal organs of frogs, 350; on the vocal organs of corvine birds, 370; on the trachea of the Merganser, 374.
  • Bison, American, co-operation of, 101; mane of the male, 521.
  • Bitterns, dwarf, coloration of the sexes of, 461.
  • Biziura lobata, musky odour of the male, 359; large size of male, 362.
  • Blackbird, sexual differences in the, 219; proportion of the sexes in the, 248; acquisition of a song by, 370; colour of the beak in the sexes of the, 383, 491; pairing with a thrush, 414; colours and nidification of the, 455; young of the, 487; sexual difference in coloration of the, 491.
  • Black-buck, Indian, sexual difference in the colour of the, 535.
  • Blackcap, arrival of the male, before the female, 212; young of the, 487.
  • Black-cock, polygamous, 219; proportion of the sexes in the, 248; pugnacity and love-dance of the, 363; call of the, 375; moulting of the, 392; duration of the courtship of the, 405; and pheasant, hybrids of, 414; sexual difference in coloration of the, 491; crimson eye-cere of the, 491.
  • Blacklock, Dr., on music, 572.
  • Black-grouse, characters of young, 465, 471.
  • Blackwall, J., on the speaking of the magpie, 90; on the desertion of their young by swallows, 108; on the superior activity of male spiders, 221; on the proportion of the sexes in spiders, 254; on sexual variation of colour in spiders, 272; on male spiders, 272.
  • Bladder-nose Seal, hood of the, 528.
  • Blaine, on the affections of dogs, 523.
  • Blair, Dr., on the relative liability of Europeans to yellow fever, 194.
  • Blake, C. C., on the jaw from La Naulette, 40.
  • Blakiston, Capt., on the American snipe, 377; on the dances of Tetrao phasianellus, 381.
  • Blasius, Dr., on the species of European birds, 422.
  • Bledius taurus, hornlike processes of male, 299.
  • Bleeding, tendency to profuse, 237.
  • Blenkiron, Mr., on sexual preference in horses, 524.
  • Blennies, crest developed on the head of male, during the breeding season, 338.
  • Blethisa multipunctata, stridulation of, 302.
  • Bloch, on the proportions of the sexes in fishes, 249.
  • Blood, arterial, red colour of, 261.
  • —— pheasant, number of spurs in, 364.
  • Bluebreast, red-throated, sexual differences of the, 472.
  • Blumenbach, on Man, 28; on the large size of the nasal cavities in American aborigines, 34; on the position of man, 149; on the number of species of man, 174.
  • Blyth, E., on the structure of the hand in the species of Hylobates, 51; observations on Indian crows, 102; on the development of the horns in the Koodoo and Eland antelopes, 234; on the pugnacity of the males of Gallinula cristata, 360; on the presence of spurs in the female Euplocamus erythrophthalmus, 364; on the pugnacity of the amadavat, 366; on the spoonbill, 374; on the