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.
Noble, Mr., on fertility of Rhododendron, 251.
Nodules, phosphatic, in azoic rocks, 307,
Oak, varieties of, 50.
Onites apelles, 135.
Orchis, pollen of, 193,
Organs: of extreme perfection, 186, electric, of fishes, 192. of little importance, 194. homologous, 434. rudiments of, 450.
Ornithorhynchus, 107, 416.
Ostrich: not capable of flight, 134. habit of laying eggs together, 218. American, two species of, 349.
Otter, habits of, how acquired, 179.
Ouzel, water, 185.
Owen, Professor: on birds not flying, 134. on vegetative repetition, 149. on variable length of arms in ourang-outang, 150. on the swim-bladder of fishes, 191. on electric organs, 192. on fossil horse of La Plata, 319. on relations of ruminants and pachyderms, 329. on fossil birds of New Zealand, 339. on succession of types, 339. on affinities of the dugong, 414. on homologous organs, 435. on the metamorphosis of cephalopods and spiders, 442.
Pacific Ocean, faunas of, 348.
Paley on no organ formed to give pain, 201.
Pallas on the fertility of the wild stocks of domestic animals, 253.
Paraguay, cattle destroyed by flies, 72.
Parasites, 217.
Partridge, dirt on feet, 362.
Parts: greatly developed, variable, 150. degrees of utility of, 201.
Parus major, 183.
Passiflora, 251.
Peaches in United States, 85.
Pear, grafts of, 261.
Pelargonium: flowers of, 145. sterility of, 251.
Pelvis of women, 144,
Peloria, 145.
Period, glacial, 365.
Petrels, habits of, 184.
Phasianus, fertility of hybrids, 253.