i. 314;

on stridulant beetles, i. 379.

JAPAN, encouragement of licentiousness in, i. 134.

JAPANESE, general beardlessness of the, ii. 321; aversion of the, to whiskers, ii. 349.

JARDINE, Sir W., on the Argus pheasant, ii. 72, 97.

JARROLD, Dr., on modifications of the skull induced by unnatural position, i. 147.

JAVANESE, relative height of the sexes of, ii. 320; notions of female beauty, ii. 347.

JAW, influence of the muscles of the, upon the physiognomy of the apes, i. 144.

JAWS, smaller in the same ratio with the extremities, i. 117; influence of food upon the size of, i. 118; diminution of, in man, i. 144; in man, reduced by correlation, ii. 325.

JAY, young of the, ii. 209; Canada, young of the, ii. 209.

JAYS, new mates found by, ii. 104; distinguishing persons, ii. 110.

JEFFREYS, J. Gwyn, on the form of the shell in the sexes of the Gasteropoda, i. 324; on the influence of light upon the colours of shells, i. 326.

JELLY-FISH, bright colours of some, i. 322.

JENNER, Dr., on the voice of the rook, ii. 61; on the finding of new mates by magpies, ii. 103; on retardation of the generative organs in birds, ii. 107.

JENYNS, L., on the desertion of their young by swallows, i. 84; on male birds singing after the proper season, ii. 107.

JERDON, Dr., on birds dreaming, 46; on the pugnacity of the male bulbul, ii. 41; on the pugnacity of the male _Ortygornis gularis_, ii. 44; on the spurs of _Galloperdix_, ii. 46; on the habits of _Lobivanellus_, ii. 48; on the spoonbill, ii. 60; on the drumming of the Kalij pheasant, ii. 63; on Indian bustards, ii. 65; on _Otis bengalensis_, ii. 69; on the ear-tufts of _Sypheotides auritus_, ii. 73; on the double moults of certain birds, ii. 82; on the moulting of the honey-suckers, ii. 83; on the moulting of bustards, plovers, and drongos, ii. 84; on display in male birds, ii. 86; on the spring change of colour in some finches, ii. 86; on the display of the under tail-coverts by the male bulbul, ii. 96; on the Indian honey-buzzard, ii. 126; on sexual differences in the colour of the eyes of hornbills,