Medicines, effect produced by, the same in man and in monkeys.
Medusae, bright colours of some.
Megalithic structures, prevalence of.
Megapicus validus, sexual difference of colour in.
Megasoma, large size of males of.
Meigs, Dr. A., on variation in the skulls of the natives of America.
Meinecke, on the numerical proportion of the sexes in butterflies.
Melanesians, decrease of.
Meldola, Mr., colours and marriage flight of Colias and Pieris.
Meliphagidae, Australian, nidification of.