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Trochilium tipuliforme, 90.

TROGONIDE, sexual colouring and

nidification of, 241.
TROPICAL birds often green, 52.
TROPICs, most favourable to pro-
duction of perfect adaptation
among animals, 68; not favour-
able to growth of civilization,
3.18.
TRoPIDoRHYNCHUs mimicked by
orioles, 104.
TRUTHFULNESs of some Savages,
353; not to be explained on
utilitarian hypothesis, 354.
TURDIDAE, sexual colouring and
nidification of, 245.
TURNIx, 115, 251.
TYNDALI, Professor, on origin of
consciousness, 361.

UPUPIDAE, sexual colouring and
nidification of, 241.

Useful, and useless variations, 34.

TJTILITY, importance of the prin-
ciple of, 47, 127.

VARIABILITY, simple, 144.

WARIATIONS, useful and useless, 34;
laws of, 143, 266; as influenced
by locality, 166; of size, 168;
universality of, 287-291; are
there limits to, 291; of domestic
dogs, 293; of pigeons, 293.

VARIETIES, instability of, supposed
to prove the permanent dis-
tinctness of species, 26; if su-
perior will extirpate original
species, 36; its reversion then
impossible, 37; of domesticated
animals may partially revert,

38, 40; inconvenience of using

the term, 161. -
VERTEBRATA, mimicry among, 99.
VoICE of man, not explained by

natural selection, 350.
WoLUCELLA, species of mimic bees,

75, 98.

WALSH, Mr., on dimorphism, of

Papilio turnus, 153.
WEAPONs and tools, how they
affect man's progress, 314.
WEEVILs often resemble small
lumps of earth, 58.
WEIR, Mr. Jenner, on a moth
refused by birds, 89; on beetles
refused by birds, 93; on cater-
pillars eaten and rejected by
birds, 119
WESTwood, Professor, objections
to theory of mimicry, 108.
WHITE colour in domesticated and
wild animals, 66.
WILD and domesticated animals,
essential differences of, 38-41.
WILL really exerts force, 367;
probably the primary source of
force, 368.
WooD, Mr. T. W., on orange-tip
butterfly, 59.
WooDCOCKS and Snipes, protective
colouring of, 53.
WooDPECKERs, why scarce in Eng-
land, 32.

AANTHIA, autumnal colours of
these moths, 62.

ZEBRAS, 299,

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