i. 136;

influence of, on man, i. 151, 154; limitation of the principle, i. 152; influence of, on social animals, i. 155; Mr. Wallace on the limitation of, by the influence of the mental faculties in man, i. 158; influence of, in the progress of the United States, i. 179.

NATURAL and sexual selection contrasted, i. 278.

NAULETTE, jaw from, large size of the canines in, i. 126.

NEANDERTHAL skull, capacity of the, i. 146.

NECK, proportion of, in soldiers and sailors, i. 117.

_Necrophorus_, stridulation of, i. 378, 382.

_Nectarinia_, young of, ii. 190.

_Nectariniae_, nidification of, ii. 169; moulting of the, ii. 83.

NEGRO, resemblance of a, to Europeans, in mental characters, i. 232.

NEGRO-WOMEN, their kindness to Mungo Park, i. 95.

NEGROES, character of, i. 216; lice of, i. 220; blackness of, i. 224, ii. 381; variability of, i. 225, 226; immunity of, from yellow fever, i. 243; difference of, from Americans, i. 247; disfigurements of the, ii. 296; colour of newborn children of, ii. 318; comparative beardlessness of, ii. 321; readily become musicians, ii. 334; appreciation of beauty of their women by, ii. 344, 346; idea of beauty among, ii. 350; compression of the nose by some, ii. 352.

NEOLITHIC period, 183.

_Neomorpha_, sexual difference of the beak in, ii. 39.

_Nephila_, i. 337.

NESTS, made by fishes, ii. 19; decoration of, by Humming-birds, ii. 112.

NEUMEISTER, on a change of colour in pigeons after several moultings, i. 294.

NEURATION, difference of, in the two sexes of some butterflies and hymenoptera, i. 345.

NEUROPTERA, i. 314, 361.

_Neurothemis_, dimorphism in, i. 363.

NEW ZEALAND, expectation by the natives of, of their extinction,