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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.
Acrxide, the subjects of mimicry,

85, 86.
Acronycta psi, protective colouring

of, 62.
Adaptation brought about by gene-
ral laws, 276; looks like design,

ÆGERudæ mimic Hymenoptera,

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.
Angræcum sesquipedale, 272; its

fertilization by a large moth,

ANIMALS, senses and faculties of,

127; intellect of, compared with

that of savages, 341.
Anoa, 196.

Anturibide, mimicry of, 94; di-

morphism in, 155.
Anthrocera filipendule, 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.
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.

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.
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.
CAPITONIDÆ, sexual colouring and

nidification of, 241. .
Capnolymma stygium, 94.
CarabiDÆ, special protection

among, 72; similar colouring

of two sexes, 114.
Cassid, 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.
CETONIAD.E, how protected, 73;

similar colours of two sexes,

CEYCOPSIS, 196. ..
Charis melipona, 96.
CHEMATOBIA, wintry colours of this

genus, 62.
Chlamys pilula, resembles dung of

caterpillars, 58.
CHRYSIDID.E, how protected, 72.
CHRYSOMELIDE, similar colouring

of two sexes, 114.
CICINDELA, adaptive colour of va-

rious species of, 57.
Cilir compressa, resembles bird's

dung, 63.
CLADOBATES, mimicking squirrels,

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
tban structure or habits, and
therefore more easily modified,
249 ; of flowers, as explained by
Mr. Darwin, 262; often corre-

lated with disease, 316.
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.
COTINGIDÆ, sexual colouring and

nidification of, 244.
CratosOMUS, a hard weevil, 94.

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