Lyell and Dawson on fossilized trees in Nova Scotia, 296.

Macleay on analogical characters, 427.

Madeira:  plants of, 107. beetles of, wingless, 135. fossil land-shells of, 339. birds of, 390.

Magpie tame in Norway, 212.

Maize, crossed, 270.

Malay Archipelago:  compared with Europe, 299. mammals of, 395.

Malpighiaceae, 417.

Mammae, rudimentary, 451.

Mammals:  fossil, in secondary formation, 303. insular, 393.

Man, origin of races of, 199.

Manatee, rudimentary nails of, 454.

Marsupials:  of Australia, 116. fossil species of, 339.

Martens, M., experiment on seeds, 360.

Martin, Mr. W. C., on striped mules, 165.

Matteuchi on the electric organs of rays, 193.

Matthiola, reciprocal crosses of, 258.

Means of dispersal, 356.

Melipona domestica, 225.

Metamorphism of oldest rocks 308.

Mice:  destroying bees, 74. acclimatisation of, 141.

Migration, bears on first appearance of fossils, 296.

Miller, Professor, on the cells of bees, 226.

Mirabilis, crosses of, 258.

Missel-thrush, 76.

Misseltoe, complex relations of, 3.

Mississippi, rate of deposition at mouth, 284.

Mocking-thrush of the Galapagos, 402.

Modification of species, how far applicable, 483.

Moles, blind, 137.

Mongrels:  fertility and sterility of, 267. and hybrids compared, 272.

Monkeys, fossil, 303,

Monocanthus, 424.

Mons, Van, on the origin of fruit-trees, 29, 39.

Moquin-Tandon on sea-side plants, 132.

Morphology, 434.

Mozart, musical powers of, 209.

Mud, seeds in, 386.

Mules, striped, 165.

Muller, Dr. F., on Alpine Australian plants, 375.

Murchison, Sir R.:  on the formations of Russia, 289. on azoic formations, 307. on extinction, 317.

Mustela vison, 179.

Myanthus, 424.

Myrmecocystus, 238.

Myrmica, eyes of, 240.

Nails, rudimentary, 453.

Natural history:  future progress of, 484. selection, 80. system, 413.

Naturalisation:  of forms distinct from the indigenous species, 115. in New Zealand, 201.

Nautilus, Silurian, 306.

Nectar of plants, 92.

Nectaries, how formed, 92.

Nelumbium luteum, 387.

Nests, variation in, 212.

Neuter insects, 236.

Newman, Mr., on humble-bees, 74.

New Zealand:  productions of, not perfect, 201. naturalised products of, 337. fossil birds of, 339. glacial action in, 373, crustaceans of, 376. algae of, 376. number of plants of, 389. flora of, 399.

Nicotiana:  crossed varieties of, 271. certain species very sterile, 257.