ossulariata_, 119.

_Acanthotritus dorsalis_, 94.

_Accipiter pileatus_, 107.

ACRAEIDAE, the subjects of mimicry, 85, 86.

_Acronycta psi_, protective colouring of, 62.

ADAPTATION brought about by general laws, 276;
looks like design, 281.

AEGERIIDAE mimic Hymenoptera, 90.

AGASSIZ, or embryonic character of ancient animals, 301.

_Agnia fasciata_, mimics another Longicorn, 95.

_Agriopis aprilina_, protective colouring of, 62.

ALCEDINIDAE, sexual colouring and nidification of, 240.

AMADINA, sexual colouring and nidification of, 243.

AMPELIDAE, sexual colouring and nidification of, 243.

ANCYLOTHERIUM, 300.

ANDRENIDAE, 98.

_Angraecum sesquipedale_, 272;
its fertilization by a large moth, 275.

ANIMALS, senses and faculties of, 127;
intellect of, compared with that of savages, 341.

ANISOCERINAE, 92.

ANOA, 196.

ANOPLOTHERIUM, 299.

ANTHRIBIDAE, mimicry of, 94;
dimorphism in, 155.

_Anthrocera filipendulae_, 120.

ANTHROPOLOGISTS, wide difference of opinion among, as to origin of
human races, 304;
conflicting views of, harmonized, 321.

ANTIQUITY of man, 303, 322.

APATHUS, 98.

APPARENT exceptions to law of colour and nidification, 253.

AQUATIC BIRDS, why abundant, 32.

_Araschnia prorsa_, 154.

ARCHEGOSAURUS, 300.

ARCHAEOPTERYX, 300.

ARCHITECTURE of most nations derivative, 228;
Grecian, false in principle, 226.

ARCTIC animals, white colour of, 50, 51.

ARGYLL, Duke of, on colours of Woodcock, 53;
on mind in nature, 265;
criticism on Darwin's works, 269;
on humming birds 282;
on creation by birth, 287.

ASILUS, 97.

ASPECTS of nature as influencing man's development, 317.

BABIRUSA, 196.

BALANCE in nature, 42.

BARRINGTON, Hon. Daines, on song of birds, 220.

BASILORNIS, 196.

BATES, Mr., first adopted the word "mimicry," 75;
his observations on Leptalis and Heliconidae, 82;
his paper explaining the theory of mimicry, 83;
objections to his theory, 108;
on variation, 165;
on recent immigration of Amazonian Indians, 214.

BAYMA, Mr., on "Molecular Mechanics," 363, 364.

BEAUTY in nature, 282;
not universal, 284;
of flowers useful to them, 285;
not given for its own sake, 285.

BIRDS, possible rapid increase of, 29;
numbers that die annually, 30;
mimicry among, 103;
d