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* Maynard, C. J., on the sexes of Chrysemys picta, 351.
 * Meckel, on correlated variation of the muscles of the arm and leg, 44.
 * Medicines, effect produced by, the same in man and in monkeys, 7.
 * Medusœ, bright colours of some, 260.
 * Megalithic structures, prevalence of, 179.
 * Megapicus validus, sexual difference of colour in, 458.
 * Megasoma, large size of males of, 279.
 * Meigs, Dr. A., on variation in the skulls of the natives of America, 26.
 * Meinecke, on the numerical proportion of the sexes in butterflies, 250.
 * Melanesians, decrease of, 185.
 * Meldola, Mr., colours and marriage flight of Colias and Pieris, 319.
 * Meliphagidæ, Australian, nidification of, 454.
 * Melita, secondary sexual characters of, 268.
 * Meloë, difference of colour in the sexes of a species of, 294.
 * Memory, manifestations of, in animals, 74.
 * Memnon, young, 168.
 * Mental characters, difference of, in different races of men, 167.
 * faculties, diversity of, in the same race of men, 26; inheritance of, 27; variation of, in the same species, 27, 66; similarity of the in different races of man, 178; of birds, 410.
 * powers, difference of, in the two sexes in man, 563.
 * Menura Alberti, 406; song of, 371.
 * superba, 406; long tails of both sexes of, 451.
 * Merganser, trachea of the male, 374.
 * serrator, male plumage of, 393.
 * Mergus cucullatus, speculum of, 236.
 * merganser, young of, 467.
 * Metallura, splendid tail-feathers of, 443.
 * Methoca ichneumonides, large male of, 279.
 * Meves, M., on the drumming of the snipe, 377.
 * Mexicans, civilisation of the, not foreign, 145.
 * Meyer, on a convoluted body at the extremity of the tail in a Macacus and a cat, 23.
 * , Dr. A., on the copulation of Phryganidæ of distinct species, 275.
 * , Prof. L., on development of helix of ear, 15, 16; men's ears more variable than women's, 224; antennæ serving as ears, 280.
 * Migrations of man, effects of, 47.
 * Migratory instinct of birds, 105; vanquishing the maternal, 107, 113.
 * Mill, J. S., on the origin of the moral sense, 98; on the "greatest happiness principle," 120; on the difference of the mental powers in the sexes of man, 564.
 * Millipedes, 274.
 * Milne-Edwards, H., on the use of the enlarged chelæ of the male Gelasimus, 267.
 * Milvago leucurus, sexes and young of, 479.
 * Mimicry, 323.
 * Mimus polyglottus, 411.
 * Mind, difference of, in man and the highest animals, 126; similarity of the, in different races, 178.
 * Minnow, proportion of the sexes in the, 249.
 * Mirror, larks attracted by, 413.
 * Mitchell, Dr., interbreeding in the Hebrides, 189.
 * Mitford, selection of children in Sparta, 29.
 * Mivart, St. George, on the reduction of organs, 12; on the ears of the lemuroidea, 15; on variability of the muscles in lemuroidea, 41, 48; on the caudal vertebræ of monkeys, 58; on the classification of the primates, 153; on the orang and on man, 154; on differences in the lemuroidea, 155; on the crest of the male newt, 348.
 * Möbius, Prof., on reasoning powers in a pike, 75.
 * Mocking-thrush, partial migration of, 411; young of the, 487.
 * Modifications, unserviceable, 62.
 * Moggridge, J. T., on habits of spiders, 69; on habits of ants, 147.