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World, species changing simultanc-

ously throughout, 297.
Wrens, nest of, 234.
Wright, Mr. Chauncey, on the giraffe,
178.

on abrupt modifications, 203.
Wyman, Prof., on correlation of com
lour and effects of poison, 9.

on the cells of the bee, 222,

Y.

Youatt, Mr., on selection, 23.

on sub-breeds of sheep, 26.

on rudimentary horns in young
cattle, 400.

Z.
Zanthoxylon, 174.
Zebra, stripes on, 128.
Zeuglodon, 302.

Wollaston, Mr., on varicties of in-
sects, 38.

on fossil varieties of shells in
Madeira, 42.

on colours of insects on sea-
shore, 107.

on wingless beetles, 109.

on rarity of intermediate va-
rieties, 136.

on insular insects, 347.
, on land-shells of Madeira, natu-
ralised, 357.
Wolves, varieties of, 71.
Woodcock with earth attached to leg,

328.
Woodpecker, habits of, 141.

- green colour of, 158.
Woodward, Mr., on the duration of
specific forms, 276.

on Pyrgoma, 284.

on the continuous succession of
genera, 293,

on the succession of types, 311.

THE END

LANE MEDICAL LIBRARY

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