i. 306;

on the house-cricket, i. 352; on the object of the song of birds, ii. 52; on the finding of new mates by white owls, ii. 105; on spring coveys of male partridges, ii. 107.

WHITENESS, a sexual ornament in some birds, ii. 232; of mammals inhabiting snowy countries, ii. 298.

WHITE-THROAT, aerial love-dance of the male, ii. 68.

WIDOW-BIRD, polygamous, i. 269; breeding plumage of the male, ii. 84, 97; female, rejecting the unadorned male, ii. 120.

WIDOWS and widowers, mortality of, i. 176.

WIGEON, pairing with a pintail duck, ii. 114.

WILCKENS, Dr., on the modification of domestic animals in mountainous regions, i. 120; on a numerical relation between the hairs and excretory pores in sheep, i. 248.

WILDER, Dr. Burt, on the greater frequency of supernumerary digits in men than in women, i. 276.

WILLIAMS, on the marriage-customs of the Fijians, ii. 374.

WILSON, Dr., on the conical heads of the natives of North-Western America, ii. 351; on the Fijians, ii. 352; on the persistence of the fashion of compressing the skull, ii. 353.

WING-SPURS, ii. 162.

WINGS, differences of, in the two sexes of butterflies and Hymenoptera, i. 345; play of, in the courtship of birds, ii. 95.

WINTER, change of colour of mammals in, ii. 298.

WITCHCRAFT, i. 68.

WIVES, traces of the forcible capture of, i. 182.

WOLF, winter change of the, ii. 298.

WOLFF, on the variability of the viscera in man, i. 109.

WOLLASTON, T. V., on _Eurygnathus_, i. 344; on musical curculionidae, i. 378; on the stridulation of _Acalles_, i. 384.

WOLVES learning to bark from dogs, i. 44; hunting in packs, i. 75.

WOLVES, black, ii. 294.

WOMBAT, black varieties of the, ii. 294.

WOMEN distinguished from men by male monkeys, i. 13; preponderance of, in numbers, i. 302; effects of selection of, in accordance with different standards of beauty, ii. 355; practice of capturing, ii. 360, 364; early betrothals and slavery of, ii. 366; selection of, for beauty, ii. 372; freedom of selection by, in savage tribes, ii. 372.

WONDER, manifestations of, by animals, i. 42.

WONFOR, Mr., on sexual peculiarities in the wings of butterflies, i. 345.

WOOLNER, Mr., observations on the ear in man, i. 22.

WOOD, J., on muscular variations in man, i. 109, 128, 129; on the greater variability of the muscles in men than in women, i. 275.

WOOD, T. W., on the colouring of the orange-tip butterfly, i. 394; on the habits of the Saturniidae, i. 398; on the habits of _Menura Alberti_, ii. 56; on _Tetrao cupido_, ii. 56; on the display of plumage by male pheasants, ii. 89; on the ocellated spots of the Argus pheasant, ii. 144; on the habits of the female Cassowary, ii. 204.

WOODCOCK, coloration of the, ii. 226.

WOODPECKER, selection of a mate by the female, ii. 116.

WOODPECKERS, ii. 56; tapping of, ii. 62; colours and nidification of the, ii. 171, 174, 223; characters of young, ii. 185, 199, 209.

WORMALD, Mr., on the coloration of _Hypopyra_, i. 397.

WOUNDS, healing of, i. 13.

WREN, ii. 198; young of the, ii. 209.

WRIGHT, C. A., on the young of _Orocetes_ and _Petrocincla_, ii. 220.

WRIGHT, Chauncey, on correlative acquisition, ii. 335; on the enlargement of the brain in man, ii. 391.

WRIGHT, Mr., on the Scotch deerhound, ii. 261; on sexual preference in dogs, ii. 271; on the rejection of a horse by a mare, ii. 272.

WRIGHT, W. von, on the protective plumage of the Ptarmigan, ii. 81.

WRITING, i. 182.

WYMAN, Prof., on the prolongation of the coccyx in the human embryo,