lopment of Tertiary mammals, 391
on specialised forms dying out, 395

Marsupials, distribution of, 350

Mathematical faculty, the origin of the, 464
how developed, 466
not developed by law of natural selection, 469

Mathematics, late development of, 465

Meldola, Professor R., on variable protective colouring, 196
on mimicry among British moths, 249 (note)
on an extension of the theory of mimicry, 255 (note)

Melons, variations of, 87

Methona psidii and Leptalis orise (figs.), 241

Meyer, Dr. A.B., on mimicry of snakes, 262

Milne Edwards, on variation of lizards, 46

Mimicking birds deceive naturalists, 264
butterfly, figure of, 241

Mimicry, 239
how it has been produced, 242
among protected genera, 249
extension of, 255
in various orders of insects, 257
among vertebrata, 261
among birds, 263
objections to theory of, 264

Mineral particles carried by wind, 363

Miocene fossils of North America, 378

Missing links, character of, 380

Mivart, Dr. St. George, on variation of ribs and dorsal vertebrae, 69
on supposed useless characters, 138 (note)
on resemblance of man and apes, 451

Modifications for special purposes, 113

Mongrels, sterility of, 165

Monkeys affected by medicines as are men, 450

Monocotyledons degradations from dicotyledons, 325 (note)
scarcity of, in Rocky Mountains, 401
scarcity of, in Alpine flora, 401

Moral nature of man, origin of, 461

Morse, Professor E.T., on protective colouring of marine mollusca, 209

Moseley, Professor, on protective resemblance among marine
animals, 208
on courtship of Great Albatross, 287

Moths, protected groups of, 235

Mountains, remote, with identical plants, 369

Mueller, Dr. Fritz, on inhabitants of bromelia leaves, 118
on butterfly, deceived by its mimic, 245
his explanation of mimicry among protected genera, 252
Dr. Hermann, on variability of Myosurus minimus, 78

Murray, Mr. John, on bulk of land and ocean, 344
on quartz particles on ocean floor, 363
Rev. R.P., variation in the neuration of butterflies' wings, 45

Musical and artistic faculties, origin of, 467

Myosurns minimus, variability of, 78

=N=

Natural selection with changed and unchanged conditions, 103
and sterility, 173
overpowers effects of use and disuse, 435
the most important agency in modifying species, 444

Naturalist deceived by a mimicking insect, 259
by mimicking birds, 264

Naudin, M