i. 77;

non-prevalence of suicide among the lowest barbarians, i. 94; on the immorality of savages, i. 97; on Mr. Wallace's claim to the origination of the idea of natural selection, i. 137; on the absence of remorse among savages, i. 164; on the former barbarism of civilised nations, i. 181; on improvements in the arts among savages, i. 182; on resemblances of the mental characters in different races of men, i. 232; on the power of counting in primeval man, i. 234; on the arts practised by savages, i. 234; on the prehensile organs of the male _Labidocera Darwinii_, i. 329; on _Chloeon_, i. 341; on _Smynthurus luteus_, i. 348; on strife for women among the North American Indians, ii. 324; on music, ii. 334; on the ornamental practices of savages, ii. 338; on the estimation of the beard among the Anglo-Saxons, ii. 349; on artificial deformation of the skull, ii. 352; on "communal marriages," ii. 358, 360; on exogamy, ii. 360, 364; on the Veddahs, ii. 363; on polyandry, ii. 365.

LUCANIDAE, variability of the mandibles in the male, i. 376.

_Lucanus_, large size of males of, i. 347.

_Lucanus cervus_, numerical proportion of sexes of, i. 313; weapons of the male, i. 375.

_Lucanus elaphus_, use of mandibles of, i. 377; large jaws of male, i. 342.

LUCAS, Prosper, on sexual preference in horses and bulls, ii. 272.

LUNAR periods, i. 212.

LUND, Dr., on skulls found in Brazilian caves, i. 218.

LUNGS, enlargement of, in the Quechua and Aymara Indians, i. 119; a modified swim-bladder, i. 207; different capacity of in races of man, i. 216.

LUMINOSITY in insects, i. 345.

LUSCHKA, Prof., on the termination of the coccyx, i. 30.

LUST, instinct of, i. 89.

LUXURY, comparatively innocuous, i. 171.

_Lycaena_, sexual differences of colouring in species of, i. 390.

LYELL, Sir C., on the antiquity of man, i. 3; on the origin of man, i. 4; on the parallelism of the development of species and languages,