igin of, 116

Weale, Mr. Mansel, on protective colours of butterflies, 206

Weeds of United States, 15

Weir, Mr. Jenner, on deceptive resemblance of a caterpillar to
a twig, 204
on inedibility of conspicuous caterpillars, 236
on birds disregarding inedible larvae, 254

Weismann on progressive adaptation of colours of larva, 206
on non-heredity of acquired characters, 440
and Galton's theories of heredity almost identical, 443 (note)
on origin of the mathematical faculty, 472 (note)

Weismann's theory of heredity, 437

Westwood, Professor, on variation of insects, 44
deceived by a mimicking cricket, 259

White coloration of insular birds and butterflies, 230

Whymper, Mr., his sensations when falling on the Matterhorn, 38

Willows, species and varieties of British, 77

Wilson, Alexander, his account of the passenger-pigeon in North
America, 31

Wind-carriage of seeds explains many facts of plant distribution,
371

Wind-dispersal of seeds, objections to, 365

Wind-fertilised degraded from insect-fertilised flowers, 324

Wings of stone-curlews (figure), 223 why small but useless are
retained, 416

Wit and humour, origin of faculties of, 472

Wollaston, Mr. T.W., on variation of beetles, 44 on small
butterfly in Porto Santo, 106

Wolves, varieties of in Catskill Mountains, 105

Wood, Mr. J., on muscular variations, 447

Mr. T.W., on variable colouring of pupae of cabbage butterflies,
197

Woodward, Dr. S.P., on variation of mollusca, 43

=Y=

Youatt, on breeds of sheep, 97

Young animals often spotted, 289

=Z=

Zebra, markings for recognition and protection, 220 (note)

THE END

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