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* Lankester, E. R., on comparative longevity, 133, 136; on the destructive effects of intemperance, 137.
 * Lanugo, of the human fœtus, 19, 600.
 * Lapponian language, highly artificial, 91.
 * Lark, proportion of the sexes in the, 248; female, singing of the, 370.
 * Larks, attracted by a mirror, 413.
 * Lartet, E., comparison of cranial capacities of skulls of recent and tertiary mammals, 55; on the size of the brain in mammals, 81; on Dryopithecus, 155; on pre-historic flutes, 570.
 * Larus, seasonal change of plumage in, 492.
 * Larva, luminous, of a Brazilian beetle, 278.
 * Larynx, muscles of the, in song-birds, 371.
 * Lasiocampa quercus, attraction of males by the female, 252; sexual difference of colour in, 316.
 * Latham, R. G., on the migrations of man, 48.
 * Latooka, perforation of the lower lip by the women of, 576.
 * Laurillard, on the abnormal division of the malar bone in man, 39.
 * Lawrence, W., on the superiority of savages to Europeans in power of sight, 33; on the colour of negro infants, 558; on the fondness of savages for ornaments, 578; on beardless races, 581; on the beauty of the English aristocracy, 586.
 * Layard, E. L., on an instance of rationality in a cobra, 352; on the pugnacity of Gallus Stanleyi, 363.
 * Laycock, Dr., on vital periodicity, 8; theroid nature of idiots, 36.
 * Leaves, autumn, tints useless, 262.
 * Lecky, Mr., on the sense of duty, 97; on suicide, 117; on the practice of celibacy, 119; his view of the crimes of savages, 119; on the gradual rise of morality, 125.
 * Leconte, J. L., on the stridulant organ in the Coprini and Dynastini, 303.
 * Lee, H., on the numerical proportion of the sexes in the trout, 249.
 * Leg, calf of the, artificially modified, 574.
 * Legitimate and illegitimate children, proportion of the sexes in, 244.
 * Legs, variation of the length of the, in man, 26; proportions of, in soldiers and sailors, 32; front, atrophied in some male butterflies, 277; peculiarities of, in male insects, 277.
 * Leguay, on the occurrence of the supra-condyloid foramen in the humerus of man, 22.
 * "Lek" of the black-cock and capercailzie, 405.
 * Lemoine, Albert, on the origin of language, 87.
 * Lemur macaco, sexual difference of colour in, 537.
 * Lemuridæ, 152; ears of the, 15; variability of the muscles in the, 41; position and derivation of the, 157; their origin, 165.
 * Lemurs, uterus in the, 38.
 * Lenguas, disfigurement of the ears of the, 575.
 * Leopards, black, 539.
 * Lepidoptera, 307; numerical proportions of the sexes in the, 250; colouring of, 308; ocellated spots of, 427.
 * Lepidosiren, 159, 165.
 * Leptalides, mimicry of, 325.
 * Leptorhynchus angustatus, pugnacity of male, 299.
 * Leptura testacea, difference of colour in the sexes of, 294.
 * Leroy, on the wariness of young foxes in hunting-districts, 80; on the desertion of their young by swallows, 108.
 * Leslie, D., marriage customs of Kaffirs, 598.
 * Lesse, valley of the, 22.
 * Lesson, on the birds of paradise, 219, 403; on the sea-elephant, 528.
 * Lessona, M., observations on Serranus, 162.
 * Lethrus cephalotes, pugnacity of the males of, 297, 300.
 * Leuckart, R., on the vesicula prostatica, 24; on the influence of the age of parents on the sex of offspring, 245.
 * Levator claviculœ muscle, 42.
 * Libellula depressa, colour of the male, 290.
 * Libellulidæ, relative size of the sexes