away. But I venture to think they will nevertheless maintain their ground, and that they can only be met by the discovery of new facts or new laws, of a nature very different from any yet known to us. I can only hope that my treatment of the subject, though necessarily very meagre, has been clear and intelligible; and that it may prove suggestive, both to the opponents and to the upholders of the theory of Natural Selection.
ABRAXAS grossulariata, 119. Acanthotritus dorsalis, 94. Accipiter pileatus, 107. ACREIDE, the subjects of mimicry, 85, 86.
Acronycta psi, protective colouring of, 62.
ADAPTATION brought about by gene- ral laws, 276; looks like design, 281.
EGERIIDE mimic Hymenoptera, 90.
AGASSIZ, or embryonic character of ancient animals, 301.
Agnia fasciata, mimics another Longicorn, 95.
Agriopis aprilina, protective colour- ing of, 62.
ALCEDINID.E, sexual colouring and
nidification of, 240.
AMADINA, sexual colouring and ni- dification of, 243. AMPELIDE, sexual colouring and nidification of, 243. ANCYLOTHERIUM, 300. ANDRENIDE, 98.
Angræcum sesquipedale, 272; its fertilization by a large moth, 275.
ANIMALS, senses and faculties of,
127; intellect of, compared with that of savages, 341. ANISOCERINE, 92. ANOA, 196.
ANOPLOTIERIUM, 299. ANTHRIBIDE, mimicry of, 94; di- morphism in, 155. Anthrocera filipendulæ, 120. ANTHROPOLOGISTS, wide difference of opinion among, as to origin of human races, 304; conflict- ing views of, harmonized, 321. ANTIQUITY of man, 303, 322. APATHUS, 98.
APPARENT exceptions to law of co- lour and nidification, 253. AQUATIC birds, why abundant, 32. Araschnia prorsa, 154. ARCHEGOSAURUS, 300. ARCHEOPTERYX, 300,
ARCHITECTURE of most nations de- rivative, 228; Grecian, false in principle, 226.
ARCTIC animals, white colour of, 50, 51. ARGYLL, Duke of, on colours of Woodcock, 53; on mind in na- ture, 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.
BATES, Mr., first adopted the word "mimicry," 75; his observations on Leptalis and Heliconidæ, 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 Me- chanics," 363, 364.
BEAUTY in nature, 282; not uni-
versal, 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; dull colour of females, 114; nidi- fication as affecting colour of females, 116; refusing the gooseberry caterpillar, 119; the highest in rank and organiza. tion, 137; dimorphism in, 155; why peculiar nest built by each species, 215-219; build more per- fect nests as they grow older, 224, 227; alter and improve their nests, 226; sexual differ- ences of colour in, 239. Bombus hortorum, 90. Bombycilla garrula, colours and nidification of, 255. BOMBYLIUS, 98.
BRAIN of the savage but slightly
less than that of civilized man, 336; size of, an important ele- ment of mental power, 335; of savage races larger than their needs require, 338, 343; of man
and of anthropoid apes com- pared, 338.
BROCA, Professor Paul, on the fine
crania of the cave men, 337. Bryophila glandifera and B. perla protectively coloured, 63. BUCEROTIDE, sexual colouring and nidification of, 241. BUCCONIDE, sexual colouring and nidification of, 241.
BUFF-TIP moth, resembles a broken stick, 62.
BUILDINGS of various races do not change, 213. BUPRESTIDE,
resembling bird's dung, 57; similar colours in two sexes, 114. BUTTERFLIES, value of, in studying
"natural selection," 131; varie- ties of, in Sardinia and Isle of Man, 178.
CACIA anthriboides, 94.
Callizona acesta, protective colour- ing of, 59. CALORNIS, 239.
CAPITONIDE, sexual colouring and nidification of, 241. Capnolymma stygium, 94. CARABIDÆ, special protection among, 72; similar colouring of two sexes, 114. CASSIDE, resemble dew drops, 58. CATERPILLARS, mimicking a poi-
sonous snake, 99; gaudy co- lours of, 117; various modes of protection of, 118; gooseberry caterpillar, 119; Mr. Jenner Weir's observations on, 119; Mr. A. G. Butler's observations on, 121.
CELEBES, local modifications of form in, 170; probable cause of these, 176; remarkable zoolo- gical peculiarities of, 195-199. CENTROPUS, sexual colouring and nidification of, 242. Cephalodonta spinipes, 92. Ceroxylus laceratus, imitates a moss covered stick, 64. CERTHIOLA, sexual colouring and nidification of, 244. Cethosia cole, 172; biblis, 172. CETONIADE, how protected, 73; similar colours of two sexes, 114.
Charis melipona, 96. CHEMATOBIA, wintry colours of this genus, 62.
Chlamys pilula, resembles dung of caterpillars, 58.
CHRYSIDIDE, how protected, 72. CHRYSOMELIDE, similar colouring of two sexes, 114. CICINDELA, adaptive colour of va- rious species of, 57. Cilix compressa, resembles bird's dung, 63.
CLADOBATES, mimicking squirrels, 107.
CLASSIFICATION, form of true, 6;
circular, inadmissible, 8; quina- rian and circular, of Swainson, 46; argument from, against Mr. Darwin, 295.
CLIMACTERIS, sexual colouring and
nidification of, 243. COCCINELLIDE, how protected, 72;
similar colouring of sexes, 114. COEXISTING varieties, 159. Collyrodes lacordairei, 95.
COLOUR, in animals, popular theo- ries of, 47; frequent variations of, in domesticated animals, 48; influenced by need of conceal- ment, 49; in deserts, 49, 50; in Arctic regions, 50, 51; noc- turnal, 51; tropical, 52; special modifications of, 52; different distribution of, in butterflies and moths, 58; of autumnal and winter moths, 62; white, generally dangerous and there- fore eliminated, 66; why it exists so abundantly although often injurious, 69; influenced by need of protection, 113; of female birds, 114; in relation to nidification of birds, 116; gaudy colours of many caterpillars, 117; in nature, general causes of, 126; local variations of, 173; sexual differences of, in birds, 239; in female birds, how connected with their nidifica- tion, 240, 246; more variable than structure or habits, and therefore more easily modified, 249; of flowers, as explained by Mr. Darwin, 262; often corre- lated with disease, 316. COMPSOGNATHUS, 300. Condylodera tricondyloides, 97. CONSCIOUSNESS, origin of, 360;
Professor Tyndall on, 361; not a product of complex organiza- tion, 365.
CORRELATION of growth, 310. Corynomalus sp., 92.
COTINGIDE, sexual colouring and nidification of, 244.
CRATOSOMUS, a hard weevil, 94.
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