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Moquin-Tandon, on sea-side plants,
Morren, on the leaves of Oxalis, 197.
Moths, hybrid, 240.
Mozart, musical powers of, 206.
Mud, seeds in, 345.
Mules, striped, 129.
Miiller, Adolf, on the instincts of the
Miiller, Dr. Ferdinand, on Alpine
Miiller, Fritz, on dimorphic crus-
, on the lancelet, 99.
r, on air-breathing crustaceans,
, on climbing plants, 197.
, on the self-sterility of orchids,
, on embryology in relation to
, on the metamorphoses of crus-
, on terrestrial and fresh-water
organisms not undergoing any me-
Multiplication of species not indefi-
Murchison, Sir R., on the forma-
, on azoic formations, 286.
, on extinction, 293.
Murie, Dr., on the modification of the
Murray, Mr. A., on cave-insects, Ill.
Mnstela vison, 138.
Myrmica, eyes of, 232.
Nageli, on morphological characters,
Nails, rudimentary, 400.
Naturalisation of forms distinct from
Naturalisation in New Zealand, 163.
, on hybrid gourds, 258.
. on reversion, 260.
Nautilus, Silurian, 286.
, naturalised products of, 309.
-, fossil birds of, 310.
, glaciers of, 335.
, crustaceans of, 338.
, algse of, 338.
, flora of, 354.
, number of plants of, 374.
Newton, Sir I., attacked for irre-
ligion, 421. , Prof., on earth attached to a
partridge's foot, 328.
Nitsche, Dr., on the Polyzoa, 193.
Noble, Mr., on fertility of Rhodo-
Nodules, phosphatic, in azoic rocks,
Oaks, variability of, 40.
Onites appelles, 108.
, the development of their
, forms of, 372.
Orchis, pollen of, 151.
Organisation, tendency to advance, 97.
Organs of extreme perfection, 143.
, electric, of fishes, 150.
of little importance, 156.
, homologous, 382.
, rudiments of, and nascent, 397.
Ornithorhynchus, 83, 367.
, mammse of, 190.
Ostrich not capable of flight, 180.
Ostrich, habit of laying eggs together,
, American, two species of, 318.
Otter, habits of, how acquired, 138.
Owen, Prof., on birds not flying, 108.
, on vegetative repetition, 118.
, on variability of unusually
developed parts, 119.
, on the eyes of fishes, 145.
■ ■, on the swim-bladder of fishes,
, on fossil horse of La Plata,
, on generalized form, 301.
, on .relations of ruminants and
pachyderms, 303. , on fossil birds of New Zealand,
•, on succession of types, 310.
, on affinities of the dugong,
, on homologous organs, 383.
, on the metamorphosis of ce-
Pacific Ocean, faunas of, 317.
Pacini, on electric organs, 151.
Paley, on no organ formed to give
Pallas, on the fertility of the domes-
Palm with hooks, 158.
Partridge, with ball of earth attached
to foot, 328.
Parus major, 141.
■ , sterility of, 239.
Pelvis of women, 115.
Petrels, habits of, 142.
Phasianus, fertility of hybrids, 240.
Pheasant, young, wild, 211.
Pictet, Prof., on groups of species
suddenly appearing, '282.
, on rate of organic change, 291.
, on continuous succession of
genera, 293. , on change in latest tertiary
forms, 278. , on close alliance of fossils in
consecutive formations, 306.
, on early transitional links, 283.
Pierce, Mr., on varieties of wolves,
Pigeons with feathered feet and skin
between toes, 9. , breeds described, and origin of,
, breeds of, how produced, 28,
, tumbler, not being able to get
out of egg, 68.
. reverting to blue colour, 127.
, instinct of tumbling, 210.
, young of, 392.
Pigs, black, not affected by the paint-
, modified by want of exercise,
Pistil, rudimentary, 397.
Plants, poisonous, not affecting cer-
, selection applied to, 27.
, gradual improvement of, 27.
, not improved in barbarous
, dimorphic, 35, 253.
, destroyed by insects, 53.
, in midst of range, have to
struggle with other plants, 60.
, nectar of, 73.
, fleshy, on sea-shores, 107.
, climbing, 147, 196.
, fresh-water, distribution of,
, low in scale, widely distri-
Pleuronectidse, their structure, 186.
Plumage, laws of change in sexes of
Plums in the United States, M.
Pointer dog, origin of, 25.
-, habits of, 210.
Poison not affecting certain coloured
animals, 9. , similar effect of, on animals
and plants, 425.
Pouchet, on the colours of flat-fish,
Prestwich, Mr., on English and
French Eocene formations, 300.
Psychology, future progress of, 428.
Quagga, striped, 129.
Quercus, variability of, 40.
Rabbit, disposition of young, 211.
Races, domestic, characters of, 12
Race-horses, Arab, 26
, English, 323.
Radcliffe, Dri) the electrical organs
Ramond, on plants of Pyrenees, 331.
Ramsay, Prof., on subaerial denu-
, on thickness of the British
formations, 268, 269.
, on faults, 268.
Ramsay, Mr., on instincts of cuckoo,
Ratio of increase, 50.
Rats supplanting each other, 59.
, acclimatisation of, 113.
, blind, in cave, 110..
Rengger, on flies destroying cattle,
Reproduction, rate of, 50.
to parents in mongrels and
Reversion, law of inheritance, 11.
, in pigeons, to blue colour, 127.
Rhododendron, sterility of, 239.
Richard, Prof., on Aspicarpa, 367.
Richardson, Sir J., on structure of
, on fishes of the southern hemi-
Robinia, grafts of, 246.
Rodents, blind, 110.
Rogers, Prof., Map of N. America,
Rudimentary organs, 397.
Rudiments important for classifica-
Rutimeyer, on Indian cattle, 14,
Salamandra atra, 397.
Sageret, on grafts, 246.
Salmons, males fighting, and hooked
jaws of, 69.
seeds, 325. not destructive to land-shells,
Salter, Mr., on early death of hybrid
, on flat-fish, 186.
Schlegel, on snakes, 113.
School, Dr., on the ears of mice, 172.
Scott, J., Mr., on the self-sterility of
orchids, 238. , on the crossing of varieties of
seeds, 325. not destructive to land-shells,
Sebright, Sir J., on crossed animals, I
suddenly appearing, 282.
• , winged, 117.
, means of dissemination, 154,
161, 327, 328. , power of resisting salt water,
, in crops and intestines of
birds, 326, 327.
, eaten by fish, 327, 346.
in mud, 345.
, hooked, on islands, 349.
Selection of domestic products, M.
•, unconscious, 27.
, natural, 62.
, sexual, 69.
, objections to term, 63.
natural, has not induced ste-
Sexes, relations of, 69.
sexual characters variable, 123.
Sheep, Merino, their selection, M.
—, two sub-breeds, unintentionally
, mountain varieties of, 59.
Shells, colours of, 107.
■ , hinges of, 154.
, littoral, seldom embedded, 270.
, fresh-water, long retain the
same forms, 308.
, fresh-water, dispersal of, 344.
—of Madeira, 349.
, land, distribution of, 349.
, land, resisting salt water, 325.
Silene, infertility of crosses, 243.
Silliman, Prof., on blind rat, 110.
Sirenia, their affinities, 302.
Sitaris, metamorphosis of, 394.
Skulls of young mammals, 159, 384.
Slave-making instinct, 216.
Smith, Col. Hamilton, on striped
, Mr. Fred., on slave-making
, on neuter ants, MI.
Smitt, Dr., on the Polyzoa, 193.
Snake with tooth for cutting through
Spaniel, King Charles's breed, M.
-, dominant, M.
, common, variable, 42.
in large genera variable, 44.
, groups of, suddenly appearing,
beneath Silurian formations,
successively appearing, 290.
throughout the world, 297.
Spencer, Lord, on increase in size of
, Herbert, Mr., on the first steps
in differentiation, 100.
, on the tendency to an equili-
Sphex, parasitic, 216.
Spiders, development of, 390.
Sports in plants, 8.
Sprengel, C. C, on crossing, 76.
, on ray-florets, 116.
Squirrels, gradations in structure,
Staffordshire, heath, changes in, M.
, their pedicellaria;, 192.
of hybrids, 236.
, laws of, 241.
, causes of, 247.
from unfavourable conditions,
not induced through natural
certain plants, 174.
, on classification, 368.
St. John, Mr., on habits of cats, 209.
Stocks, aboriginal, of domestic ani-
Strata, thickness of, in Britain, 268,
Stripes on horses, 128.
of types in same areas, 310.
Swallow, one species supplanting
t he feet of migratory birds, 328.
Tail of giraffe, 157.
of aquatic animals, 157.
, prehensile, 188.
, rudimentary, 400.
Tanais, dimorphic, M.
Tarsi, deficient, 108.
Tausch, Dr., on umbelliferse, 173.
Teeth and hair correlated, 115.
, rudimentary, in embryonic,
calf, 397, 420.
Temminck, on distribution aiding
habitable world, 286. , on the consolidation of the
crust of the earth, 409.
, mocking, of the Galapagos, 356.
, young of, spotted, 388.
, nest of, 234.
Thuret, M., on crossed fuci, 243.
Tierra del Fuego, dogs of, 211.
, plants of, 341.
Toads on islands, 350.
Tobacco, crossed varieties of, 258.
Tomes, Mr., on the distribution of
Transitions in varieties rare, 134.
Traquair, Dr., on flat-fish, 188.
Trautschold, on intermediate varie-
Trees on islands belong to peculiar
with separated sexes, 78.
Trifolium pratense, 57, 75.
, sudden extinction of, 297.
Trimen, Mr., on imitating-insects,
Trimorphism in plants, 35, 252.
Tuco-tuco, blind, 110.
Tumbler pigeons, habits of, heredi-
, young of, 392.
Turkey-cock, tuft of hair on breast,
, naked skin on head, 158.
, young of, instinctively wild,
Turnip and cabbage, analogous vari-
Type, unity of, 166, 167.
Types, succession of, in same areas,
Udders enlarged by use, 8.
, rudimentary, 397.
Ulex, young leaves of, 388.
, outer and inner florets of, 173.
Unity of type, 166, 167.
, effects of, in a state of nature,
Utility, how far important in the