on modern changes of the earth, 95.
----, on measure of denudation, 284.
----, on a carboniferous land-shell, 289.
----, on strata beneath Silurian system, 308.
----, on the imperfection of the geological record, 311.
----, on the appearance of species, 312.
----, on Barrande's colonies, 313.
----, on tertiary formations of Europe and North America, 323.
----, on parallelism of tertiary formations, 328.
----, on transport of seeds by icebergs, 363.
----, on great alternations of climate, 382.
----, on the distribution of fresh-water shells, 385.
----, on land-shells of Madeira, 402.
Lyell and Dawson on fossilized trees in Nova Scotia, 297.

M.

Macleay on analogical characters, 426.
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, 300.
----, mammals of, 395.
Malpighiaceae, 417.
Mammae, rudimentary, 451.
Mammals, fossil, in secondary formation, 304.
----, insular, 394.
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.
Matteucci 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, 297.
Miller, Prof., 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, 268.
---- and hybrids compared, 272.
{498}
Monkeys, fossil, 304.
Monocanthus, 424.
Mons, Van, on the origin of fruit-trees, 29.
Moquin-Tandon on sea-side plants, 132.
Morphology, 433.
Mozart, musical powers of, 209.
Mud, seeds in, 386.
Mules, striped, 165.
Mueller, Dr. F., on Alpine Australian plants, 375.
Murchison, Sir R., on the formations of Russia, 290.
----, on azoic formations, 308.
----, on extinction, 317.
Mustela vison, 179.
Myanthus, 42