i. 128;

on the position of the Seals, i. 190; on the throat-pouch of the male Bustard, ii. 58.

FLY-CATCHERS, colours and nidification of, ii. 170.

FOETUS, human, woolly covering of the, i. 25; arrangement of the hair on, i. 193.

FOOD, influence of, upon stature, i. 115.

FOOT, prehensile, in the early progenitors of man, i. 206; prehensile power of the, retained in some savages, i. 142.

FORAMEN, supra-condyloid, exceptional occurrence of in the humerus of man, i. 28, 130; in the early progenitors of man, i. 206.

FORBES, D., on the Aymara Indians, i. 119; on local variation of colour in the Quechuas, i. 246; on the hairlessness of the Aymaras and Quechuas, ii. 322; on the long hair of the Aymaras and Quechuas, ii. 320, 348.

FOREL, F., on white young swans, ii. 211.

_Formica rufo_, size of the cerebral ganglia in, i. 145.

FOSSILS, absence of, connecting man with the apes, i. 201.

FOWL, occurrence of spurs in the female, i. 280; game, early pugnacity of, i. 295; Polish, early development of cranial peculiarities of, i. 295; variations in plumage of, ii. 74; examples of correlated development in the, ii. 130; domestic, breeds and sub-breeds of, ii. 178.

FOWLS, spangled Hamburgh, i. 281, 294; sexual peculiarities in, transmitted only to the same sex, i. 283; loss of secondary sexual characters by male, i. 284; inheritance of changes of plumage by, i. 281; Polish, origin of the crest in, i. 284; period of inheritance of characters by, i. 294; cuckoo-, i. 294; development of the comb in, i. 295; numerical proportion of the sexes in, i. 306; courtship of, ii. 117; mongrel, between a black Spanish cock and different hens, ii. 131; pencilled Hamburgh, difference of the sexes in, ii. 158; Spanish, sexual differences of the comb in, ii. 158; spurred, in both sexes, ii. 162.

FOX, W. D., on some half-tamed wild ducks becoming polygamous, and on polygamy in the guinea-fowl and canary-bird, i. 270; on the proportion of the sexes in cattle, i. 305; on the pugnacity of the peacock, ii. 46; on a nuptial assembly of magpies, ii. 102; on the finding of new mates by crows, ii. 104; on partridges living in triplets, ii. 107; on the pairing of a goose with a Chinese gander, ii. 114.

FOXES, wariness of young, in hunting districts, i. 50; black, ii. 294.

FRANCE, numerical proportion of male and female births in, i. 301.

FRANCESCO, B., on the Simian resemblances of man, i. 4.

FRASER, C., on the different colours of the sexes in a species of _Squilla_, i. 335.

_Fringilla cannabina_, ii. 86.

_Fringilla ciris_, age of mature plumage in, ii. 213.

_Fringilla cyanea_, age of mature plumage in, ii. 213.

_Fringilla leucophrys_, young of, ii. 217.

_Fringilla spinus_, ii. 115.

_Fringilla tristis_, change of colour in, in spring, ii. 85; young of, ii. 216.

FRINGILLIDAE, resemblance of the females of distinct species of, ii. 192.

FROGS, ii. 25; male, temporary receptacles for ova possessed by, i. 254; ready to breed before the females, i. 260; vocal organs of, ii. 28.

FRONTAL bone, persistence of the suture in, i. 124.

FRUITS, poisonous, avoided by animals, i. 36.

FUEGIANS, i. 167, 181; mental capacity of the, i. 34; quasi-religious sentiments of the, i. 67; power of sight in the, i. 118; skill of, in stone-throwing, i. 138; resistance of the, to their severe climate, i. 156, 237; difference of stature among the, i. 115; mode of life of the, i. 246; resemblance of, in mental characters, to Europeans, i. 232; aversion of, to hair on the face, ii. 348; said to admire European women, ii. 351.

FULGORIDAE, songs of the, i. 351.

FUR, whiteness of, in arctic animals, in winter, i. 282.

FUR-BEARING animals, acquired sagacity of, i. 50.

G.

_Gallicrex_, sexual difference in the colour of the irides in, ii. 128.

_Gallicrex cristatus_, red caruncle occurring in the male during the breeding-season, ii. 80.

GALLINACEAE, frequency of polygamous habits and of sexual differences in the, i. 269; love-gestures of, ii. 68; decomposed feathers in, ii. 74; stripes of young, ii. 184; comparative sexual differences between the species of, ii. 192, 194; plumage of, ii. 195.

GALLINACEOUS birds, weapons of the male, ii. 44; racket-shaped feathers on the heads of, ii. 73.

_Gallinula chloropus_, pugnacity of male, ii. 40.

_Gallinula cristata_, pugnacity of the male, ii. 41.

_Galloperdix_, spurs of, ii. 46; development of spurs in the female, ii. 162.

_Gallophasis_, young of, ii. 190.

_Gallus bankiva_, ii. 158; neck-hackles of, ii. 84.

_Gallus Stanleyi_, pugnacity of the male, ii. 44.

GALLS, i. 152.

GALTON, Mr., on the struggle between the social and personal impulses,