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Horses destid. 147.

when solied by, 35

Gooffroy on correlation, 131.

Hooker, Dr., on acclimatisation of Hima
on variable parts being often mon-

layan trees, 127.
strous, 140.

on flowers of umbelliferæ, 132.
Geographical distribution, 302.

on glaciers of Himalaya, 324.
Geography, ancient, 422

on algæ of New Zealand, 337.
Geology, future progress of, 421.

on vegetation at the base of the
imperfection of the record, 245.

Himalaya, 329.
Giraffe, tail of, 174.

on plants of Tierra del Fuego, 326,
Glacial period, 318.

329.
Gmelin on distribution, 318.

on Australian plants, 327, 347.
Gnathodoa, fossil, 321.

on relations of flora of South Amer.
Godwin-Austen, Mr., on the Malay Archi-

ica, 330.
pelago, 262.

on flora of the Antarctic lands, 341,
Goethe on compensation of growth, 133.

347.
Gooseberry, grafts of, 231.

on the plants of the Galapagos, 341,
Gould, Dr. A., on land-shells, 345.

347.
Mr., on colours of birds, 121.

Hooks on bamboos, 176.
on birds of the Galapagos, 347.

to seeds on islands, 342.
on distribution of genera of birds, Horner, Mr., on the antiquity of Egyp-
352.

tians, 23.
Gourds, crossed, 238.

Horns, rudimentary, 394.
Grafts, capacity of, 231.

Horse, fossil, in La Plata, 278.
Grasses, varieties of, 105.

Horse's destroyed by flies in La Flata, 70.
Gray, Dr. Asa, on trees of United States, striped, 147.
94.

proportions of, when young, 386.
on naturalised plants in the United Horticulturists, selection applied by, 35.
States, 107.

Huber on cells of bees, 205.
on rarity of intermediate varieties, P., on reason blended with instinct,

158.
on Alpine plants, 318.

on habitual nature of instincts, 186.
Dr. J. E., on striped mule, 149.

on slave-making ante, 195.
Grebe, 165.

on Melipona domestica, 200.
Groups, aberrant, 373.

Humble-bees, cells of, 200.
Grouse, colours of, 81.

Hunter, J., on secondary sexual charac-
red, a doubtful specles, 50.

ters, 136.
Growth, compensation of, 134.

Hutton, Captain, on crossed geese, 224.
correlation of, in domestic products, Huxley, Prof., on structure of hermaph-

18.
correlation of, 130

on embryological succession, 295.

on homologous organs, 381.
Habit, effect of, under domestication, 17.

on the development of aphis, 384.
effect of, under nature, 122.

Hybrids and mongrels compared, 239.
diversified, of same species, 164. Hybridism, 217.
Hair and teeth, correlated, 131.

Hydra, structure of, 170.
Harcourt, Mr. E. V., on the birds of Ma-
deira, 340.

Ibla, 134.
Hartung, M., on boulders in the Azores, Icebergs transporting seeds, 316.
317.

Increase, rate of, 63.
Hazel-nuts, 313.

Individuals, numbers favourable to selec-
Hearne on habits of bears, 165.

tion, 96.
Heath, changes in vegetation, 70.

many, whether simultaneously cre-
Heer, O., on plants of Madeira, 100.

ated, 310.
Helix pomatia, 846.

Inheritance, laws of, 19.
Helosciadium, 313.

at corresponding ages, 20, 82.
Hemionus, striped, 147.

Insects, colour of, fitted for habitations
Herbert, W., on struggle for existence, 61.

81.
on sterility of hybrids, 220.

sea-side, colours of, 121.
Hermaphrodites crossing, 91.

blind, in caves, 126.
Heron eating seed, 338.

luminous, 173.
Heron, Sir R., on peacocks, 84.

neuter, 209.
Heusinger on white animals not poisoned Instinct, 185.
by certain plants, 18,

Instincts, domestic, 190.
Hewitt, Mr., on sterility of first crosses, Intercrossing, advantages of, 90.
233.

Islands, oceanic, 338.
Himalaya, glaciers of, 324.

Isolation favourable to selection, 97.
plants of, 326.
Hippeastrum, 221.

Japan, productions of, 324.
Holly-trees, sexes of, 88.

Java, plants of, 326.
Hollyhock, varieties of, crossed, 239, Jones, Mr. J. M., on the birds of Bermu-
Hooker, Dr., on trees of New Zealand, 94.

da, 340.

Luizley, Prites, 94rical succe, 381... 384.

insular, 34ces of, 17: of, 394.

este

Jussieu on classification, 363.

| Madeira, fossil land-shells of, 296.

birds of, 340.
Kentucky, caves of, 125.

Magpie tame in Norway, 189.
Kerguelen-land, flora of, 331, 347.

Maize, crossed, 238.
Kidney-bean, acclimatisation of, 129. Malay Archipelago compared with Eu
Kidneys of birds, 131.

rope, 262.
Kirby on tarsi deficient in beetles, 123. : mammals of, 344.
Knight, Andrew, on cause of variation, 14. Malpighiaceæ, 363.
Kolreuter on the barberry, 92.

Mammæ, rudimentary, 392.
on sterility of hybrids, 218.

Mammals, fossil, in secondary formation,
on reciprocal crosses, 228.

265.
on crossed varieties of nicotiana, 239.
on crossing male and hermaphrodite Man, origin of races af, 178.
flowers, 392.

Manatee, rudimentary nails of, 394.

Marsupials of Australia, 107.
Lamarck on adaptive characters, 371.

fossil species of, 296.
Land-shells, distribution of, 346.

Martens, M., experiment on seeds, 315.
of Madeira, naturalised, 350.

Martin, Mr. W.O., on striped mules, 148.
Languages, classification of, 367.

Matteuchi on the electric organs of rays,
Lapse, great, of time, 247.

172.
Larvæ, 382.

Matthiola, reciprocal cros
Laurel, nectar secreted b

Means of dispersal, 311.
Laws of variation, 120.

Melipona domestica, 200.
Leech, varieties of, 73.

Metamorphism of oldest rocks, 269.
Leguminosæ, nectar secreted by g

Mice destroying bees, 72.
Lepidosiren, 100, 288.

acclimatisation of, 128.
Life, struggle for, 60.

Migration, bears on first appearance of
Lingula, Silurian, 268.

fossils, 259.
Linnæus, aphorism of, 360.

Miller, Prof., on the cells of bees, 201.
Lion, mane of, 84.

Mirabílis, crosses of, 228.
young of, striped, 382

Missel-thrush, 74.
Lobelia fulgens, 71, 92.

Misseltoe, complex relations of, 11.
Lobelia, sterility of crossos, 221.

Mississippi, rate of deposition at mouth,
Loess of the Rhine, 335.

249.
Lowness of structure connected with va- Mocking-thrush of the Galapagos, 350.
riability, 135.

Modification of species, how far applica
Lowness, related to wide distribution, 353.

ble, 418.
Lubbock, Mr., on the nerves of coccus, 47. Moles, blind, 125.
Lucas, Dr. P.; on inheritance, 19.

Mongrels, fertility and sterility of, 236.
on resemblance of child to parent, and hybrids compared, 239.
242.

Monkeys, fossil, 265.
Lund and Clausen on fossils of Brazil, 296. Monocanthus, 369.
Lyell, Sir C., on the struggle for existence, Mons, Van, on the origin of fruit-trees, 32.
61.

Moquin-Tandon on sea-side plante, 121.
on modern changes of the earth, 90. Morphology, 377.
on measure of denudation, 249. Mozart, musical powers of, 186.
on a carboniferous land-shell, 253. Mud, seeds in, 337.
on fossil whales, 265.

Mules, striped, 148.
on strata beneath Silurian system, Müller, Dr. É., on Alpine Australian
268.

plants, 327.
on the imperfection of the geological Murchison, Bir R., on the formations of
record, 271.

Russia, 253.
on the appearance of species, 273.

on azoic formations, 268.
on Barrande's colonies, 274.

on extinction, 277.
on tertiary formations of Europe and Mustela vison, 161.
North America, 282.

| Myanthus, 369.
on parallelism of tertiary formations, Myrmecocystus, 211.
287.

Myrmica, eyes of, 213.
on transport of seeds by icebergs,
317.

Nails, rudimentary, 393.
on great alternations of climate, 332. Natural history, future progress of, 419.
on the distribution of fresh-water selection, 77.
shells, 336.

system, 360.
on land-shells of Madeira, 350. Naturalisation of forms distinct from tho
Lyell and Dawson on fossilised trees in

indigenous species, 107.
Nova Scotia, 259.

in New Zealand, 180.

Nautilus, Silurian, 268.
Macleay on analogical characters, 371. Nectar of plants, 88.
Madeira, plants of, 100.

Nectaries, how formed, 88.
beetles of, wingless, 124.

Nelumbium luteum, 337.

R

Nests, variation in, 189.

| Philippi on tertiary species in Sicily, 273.
Neuter insects, 209.

Pictet, Prof., on groups of species sudden.
Newman, Mr., on humble-bees, 72.

ly appearing, 264, 267.
New Zealand, productions of, not perfect, on rate of organic change, 274.
180.

on continuous succession of genera,
naturalised products of, 294.

277.
fossil birds of, 296.

on close alliance of fossils in con-
glacial action in, 325.

secutive formations, 293.
crustaceans of, 328.

on embryological succession, 295.
algæ of, 328.

Pierce, Mr., on varieties of wolves, 87.
number of plants of, 339.

Pigeons with feathered feet and skin be-
flora of, 347.

tween toes, 18.
Nicotiana, crossed varieties of, 239.

breeds described, and origin of, 25.
certain species very.sterile, 227.

breeds of, how produced, 41, 44
Noble, Mr., on fertility of Rhododendron, tumbler, not being able to get out of
222.

egg, 83.
Nodules, phosphatic, in azoic rocks, 269. reverting to blue color, 114.

instinct of tumbling, 191.
Oak, varieties of, 51.

carriers, killed by hawks, 315.
Onites a pelles, 123.

young of, 387.
Orchis, pollen of, 173.

Pistil, rudimentary, 392.
Organs of extreme perfection, 167.

Plants, poisonous, not affecting certain
electric, of fishes, 172.

coloured animals, 18:
of little importance, 174.

selection applied to, 36.
homologous, 377.

gradual improvement of, 40.
rudiments of, 391.

not improved in barbarous cjuntries,
Ornithorhynchus, 100, 362.

40.
Ostrich not capable of Aight, 123.

destroyed by insects, 66.
habit of laying eggs together, 194.

in midst of range, bave to struggle
American, two species of, 305.

with other plants, 75.
Otter, habits of, how acquired, 161.

nectar of, 87.
Ouzel, water, 166.

fleshy, on sea-shores, 121, 3..
Owen, Prof., on birds not flying, 123.

fresh-water, distribution of, 336.
on vegetative repetition, 135.

low in scale, widely distributed, 353.
on variable length of arms in ourang. Plumage, laws of change in sexes of birds,

outang, 136.
on the swim-bladder of fishes, 171. Plums in the United States, 81.
on electric organs, 172.

| Pointer dog, origin of, 38..
on fossil borse of La Plata, 279.

habits of, 190.
on relations of ruminants and pachy. Poison not affecting certain caoured ani,
derms, 288.

mals, 18.
on fossil birds of New Zealan

Poison, similar effect of, on animals and
on succession of types, 296.

plants, 419.
on affinities of the dugong, 361. Pollen of fir-trees, 181.
on homologous organs, 378.

Poole, Col., on striped hemionus, 147.
on the metamorphosis of cephalo Potamogeton, 337.
pods and spiders, 384.

Prestwich, Mr., on English and French

eocene formations, 287.
Pacific Ocean, faunas of, 304.

Primrose, 51.
Paley on no organ formed to give pain, sterility of, 219.
179.

Primula, varieties of, 51. '
Pallas on the fertility of the wild stocks Proteolepas, 134.
of domestic animals, 224.

Proteus, 127.
Paraguay, cattle destroyed by flies, 71. Psychology, future progress of, 423.
Parasites, 194.
Partridge, dirt on feet, 316.

Quagga, striped, 149.
Parts greatly developed, variable, 136. Quince, grafts of, 231. :" .

degrees of utility of, 179.
Parus major, 164.

Rabbit, disposition of young, 192.
Passiflora, 221.

Races, domestic, characters of, 21.
Peaches in United States, 81.

Race-horses, Arab, 38.
Pear, grafts of, 231.

English, 310.
Pelargonium, flowers of, 132.

Ramond on plants of Pyrenees, 320.
sterility of, 222.

Ramsay, Prof., on thickness of the British
Pelvis of women, 131.

formations, 249.
Peloria, 132.

on faults, 250...
Period, glacial, 318. -

Ratio of increaso, 63.
Petrels, habits of, 165.

Rats, supplanting each other, 74.
Phasianus, fertility of hybrids, 224.

acclimatisation of; 128.
Pheasant, young, wild, i92.

blind in cave, 125.

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Rattle-snake, 179.

Smith, Mr. Fred., on neuter ants, 212.
Reason and instinct, 186.

Mr., of Jordan Hill, on the degrada.
Recapitulation, general, 398.

tion of coast-rocks, 248.
Reciprocity of crosses, 228.

Snap-dragon, 145.
Record, geological, imperfect, 245.

Bomerville, Lord, on selection of sheep,
Rengger on flies destroying cattle, 70.

34.
Reproduction, rate of, 63.

Sorbus, grafts of, 231.
Resemblance to parents in mongres and Spaniel, King Charles's breed, 38.
hybrids, 241.

Species, polymorphic, 48.
Reversion, law of inheritance, 20.

common, variable, 54.
in pigeons to blue colour, 144.

in large genera variable, 55.
Rhododendron, sterility of, 222.

groups of, suddenly appearing, 264,
Richard, Prof., on Aspicarpa, 363.

268.
Richardson, Sir J., on structure of squir beneath Silurian formations, 268.
rels, 162.

successively appearing, 273.
on fishes of the southern hemisphere, changing simultaneously throughout
327.

the world, 282.
Robinia, grafts of, 231.

Spencer, Lord, on increase in size of cattle,
Rodents, blind, 125.

38.
Rudimentary organs, 391.

Sphex, parasitic, 195.
Rudiments important for classification, Spiders, development of, 384.
362.

Spitz-dog crossed with fo

Sports in plants, 16.
Sageret on grafts, 231.

Sprengle, O. c., on crossing, 92,
Salmons, males fighting, and hooked jaws on ray-fiorets, 132.
of, 84.

Squirrels, gradations in structure, 162.
Salt water, how far injurious to seeds, 312. Staffordshire, heath, changes in, 70.
Saurophagus sulphuratus, 164.

Stag-beetles, fighting, 84.
Schiödte on blind insects, 126.

Sterility from changed conditions of life,
Schlegel on enakes, 131.

16.
Se3-water, how far injurious to seeds, 312. of hybrids, 218.
Sebright, Sir J., on crossed animals, 25.

laws of, 225.
on selection of pigeons, 34.

causes of, 232.
Sedgwick, Prof., on groups of species sud from unfavourable conditions, 234.
denly appearing, 264.

of certain variettes, 237.
Beedlings destroyed by insec cts, 66

St. Helena, productions of, 339.
Beeds, nutriment in, 75.

St. Hilaire, Aug., on classification, 364,
winged, 133.

St. John, Mr., on habits of cats, 86.
power of resisting salt water, 312. Sting of bee, 180.

ps and intestines of birds, 315. Stocks, aboriginal, of domestic animals, 23.
eaten by fish, 316, 337. .

Strata, thickness of, in Britain, 249.
in mud, 337.

Stripes on horses, 147.
hooked, on islands, 341.

Structure, degrees of utility of, 179.
Selection of domestic products, 33.

Struggle for existence, 60.
principle not of recent origin, 36. Succession, geological, 273.
unconscious, 37.

Succession of types in same areas, 295.
natural, 77.

Swallow, one species supplanting another,
sexual, 83.

74.
natural, circumstances favourable Swim-bladder, 170.
to, 95.

System, natural, 360.
Sexes, relations of, 83.
Sexual characters 'variable, 141.

Tail of giraffe, 174.
selection, 83,

of aquatic animals, 175.
Bheep, Merino, their selection, 35.

rudimentary, 394.
two sub-breeds unintentionally pro- Tarsi deficient, 123.
duced, 39.

Tausch on umbelliferous flowers, 132.
mountain, varieties of, 73.

Teeth and hair correlated, 131.
Shells, colours of, 121.

embryonic, traces of, in birds, 391.
littoral, heldom embedded, 253.

rudimentary, in embryonic calf, 391,
fresh-water, dispersal of, 335.

416.
of Madeira, 341.

Tegetmeier. Mr.. on cells of bees. 202. 207.
land, distribution of, 346.

Temminck on distribution aiding classifi-
Bilene, fertility of crosses, 227.

cation, 365.
Billimán, Prof., on blind rat, 125.

Thouin on grafts, 231.
Bkulls of young mammals, 176, 380. Thrush, aquatic species of, 166.
Slave-making instinct, 195.

mocking, of the Galapagos, 350.
Smith, Col. Hamilton, on striped horses, young of, spotted, 382.
148.

nest of, 215.
Mr. Fred., on slave-making ants, Thuret, M., on crossed fusi, 228.
195.

Thwaites, Mr., on acclimatisation, 128.

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Weala logarity

Tierra del Fuego, dogs of, 192.

| Wallace, Mr., on origin of species, 10.
plants of, 326, 320.

on law of geographical distribution,
Timber-drift, 314.

310.
Time, lapse of, 247.

on the Malay Archipelago, 344.
Titmouse, 164.

Wasp, sting of, 180.
Toads on islands, 342.

Water, fresh, productions of, 334.
Tobacco, crossed varieties of, 239.

Water-hen, 166.
Tomes, Mr., on the distribution of bats, Waterhouse, Mr., on Australian margu-
343.

pials, 108.
Transitions in varieties rare, 155.

on greatly developed parts being
Trees on islands belong to peculiar orders,

variable, 136.
342.

on cells of bees, 200.
with separated sexes, 93.

on general affinities, 373. .
Trifolium pratense, 71, 89.

Water-ouzel, 166.
incarnatum, 89,

Watson, Mr. H. C., on range of varieties
Trigonia, 281,

of British plants, 58.
Trilobites, 268.

on acclimatisation, 128.
sudden extinction of, 281.

on flora of Azores, 316."
Troglodytes, 216.

on Alpine plants, 320, 327.
Tucutucu, blind, 125.

on rarity of intermediate varieties,
Tumbler pigeons, habits of, hereditary,
191.

Weald, denudation of, 250.
young of, 387.

Web of feet in water-birds, 166.
Turkey-cock, brush of hair on breast, 85. West Indian islands, mammals of, 344.
Turkey, naked skin on head, 176.

Westwood on species in large genera being
young, wild, 192.

closely allied to others, 57.
Turnip and cabbage, analogous variations on the tarsi of Engidæ, 142.
of, 144.

on the antennæ of hymenopterous
Type, unity of, 184.

insects, 362.
Types, succession of, in same areas, 295. Whales, fossil, 265.

Wheat, varieties of, 105.
Udders enlarged by use, 17.

White Mountains, flora of, 318.
rudimentary, 392."

Wings, reduction of size, 123.
Ulex, young leaves of, 382.

of insects homologous with bran-
Umbelliferæ, outer and inner florets of, 131.

chiæ, 171.
Unity of type, 184.

rudimentary, in insects, 391.
Use, effects of, under domestication, 17. Wolf crossed with dog, 191.

effects of, in a state of nature, 122, of Falkland Isles, 343.
123,

Wollaston, Mr., on varieties of insecte, 50.
Utlity, how far important in the con on fossil 'varieties of land-shells in
struction of each part, 178.

Madeira, 53.

on colours of insects on sea-shore,
Valenciennes on fresh-water fish, 335.
Variability of mongrels and hybrids, 241.

on wingless beetles, 124.
Variation under domestication, 14.

on rarity of intermediate varieties,
caused by reproductive system being

158.
affected by conditions of life, 15. on insular insects, 339.
under nature, 46.

on land-shells of Madeira, natu-
laws of, 120.

ralised, 350.
Variations appear at corresponding ages, Wolves, varieties of, 86.
20, 82.

Woodpecker, habits of, 165.
analogous in distinct species, 144.

green colour of, 176.
Varieties, natural, 46.

Woodward, Mr., on the duration of spa
struggle between, 73.

cific forms, 257.
domestic, extinction of, 104.

on the continuous succession of gen.
transitional, rarity of, 154.

era, 276.
when crossed, fertile, 236.

on the succession of types, 296.
when crossed, sterile, 237.

World, species changing simultaneously
classification of, 368.'

throughout, 282.
Verbascum, sterility of, 222.

Wrens, nest of, 215.
varieties of, crossed, 238.
Verneuil, M. de, 'on the succession of spe- Youatt, Mr., on selection, 34.
cies, 284.

on sub-breeds of sheep, 39.
Viola tricolor, 71.

on rudimentary horns in young cat-
Volcanic islands, denudation of, 249.

tle, 394.
Vulture, naked skin on head, 176.

Zebra, stripes on, 147.
Wading-birds, 337.

121.

10.

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