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Geoffroy on correlation, 131.

on variable parts being often mon-
strous, 14a
Geographical distribution, 302.
Geography- ancient, 422.
Geology, future progress of, 421.

imperfection of the record, 245.
Giraffe, tail of, 174.
Glacial period, 318.
Gmelin on distribution, 318.
Gnathodoa, fossil, 321.
Godwin-Austen, Mr., on the Malay Archi-
pelago, 262.
Goethe on compensation of growth, 133.
Gooseberry, grafts of, 231.
Gould, Dr. A., on land-shells, 345.

Mr., on colours of birds, 121.

on birds of the Galapagos, 347.

on distribution of genera of birds,
352.

Gourds, crossed, 238.
Grafts, capacity of, 231.
Grasses, varieties of, 105.
Gray, Dr. Asa, on trees of United States,
M.

on naturalised plants in the United

States, 107.
on rarity of intermediate varieties,

158.

en Alpine plants, 318.

Dr. J. E., on striped mule, 140.
Grebe, 165.
Groups, aberrant, 373.
Grouse, colours of, 81.

red, a doubtful speo'es, 50.
Growth, compensation of- 134.

correlation of, in domestic products,
18.

correlation of, 130

Habit, effect of, under domestication, 17.

effect of, under nature, 122.

diversified, of same species, 164.
Hair and teeth, correlated, 131.
Harcourt, Mr. E. V., on the birds of Ma-
deira, 340.

Hartung, M., on boalders in the Azores,
817.

Haxel-nuts, 313.

Hearne on habits of bears, 165.

Heath, changes in vegetation, 70.

Heer, O., on plants ofMadeira, 100.

Helix pomatia, 346.

Helosciadium, 813.

Hemionus, striped, 147.

Herbert, W.,on struggle for existence, 61.

on sterility of hybrids, 220.
Hermaphrodites crossing, 91 .
Heron eating seed, 338.
Heron, Sir R., on peacocks, 84.
Hensinger on white animals not poisoned

by certain plants, 18.
Hewitt, Mr., on sterility of first crosses,

233.

Himalaya, glaciers of, 324.

plants of, 326.
Hippeastrum, 221.
Holfy-trees, sexes of, 88.
Hollyhock, varieties of, crossed, 239.
Hooker, Dr., on trees of New Zealand, 94.

Hooker, Dr., on acclimatisation of Hima-
layan trees, 127.

on flowers of umbelliferse, 132.

on glaciers of Himalaya, 324.

on algaB of New Zealand, 327.

on vegetation at the base of the
Himalaya. 329.

on plants of Tierra del Fnego, 326,
329.

on Australian plants, 327, 347.
on relations of flora of South Amer-
ica, 330.

on flora of the Antarctic lands, 341,
347.

on the plants of the Galapagos, 341,
347.

Hooks on bamboos, 176.

to seeds on islands, 342.
Horner, Mr., on the antiquity of Egyp-
tians, 23.
Horns, rudimentary, 394.
Horse, fossil, in La Plata, 278.
Horses destroyed by flies in La Plata, 70.

striped, 147.

proportions of, when young, 386.
Horticulturists, selection applied by, 35.
Huber on cells of bees, 205.

P., on reason blended with instinct,
186.

on habitual nature of instincts, 186.

on slave-making ants, 195.

on Melipona domestica, 200.
Humble-bees, cells df, 200.
Hunter, J., on secondary sexual charac-
ters, 136.

Hutton, Captain, on crossed geese, 224.
Huxley, Prof., on structure of hermaph-
rodites, 94.

on embryological succession, 295.

on homologous organs, 381.

on the development of aphis, 384.
Hybrids and mongrels compared, 239.
Hybridism, 217.
Hydra, structure of, 170.

Ibla, 134.

Icebergs transporting seeds, 316.
Increase, rate of, 63.

Individuals, numbers favourable to selec-
tion, 96.

many, whether simultaneously cre-
ated, 310.
Inheritance, laws of, 19.

at corresponding ages, 20, 82.
Insects, colour of, fitted for habitations
81.

sea-side, colours of, 121.

blind, in caves, 126.

luminous, 173.

neuter, 209.
Instinct, 185.
Instincts, domestic, 190.
Intercrossing, advantages of, 90.
Islands, oceanic, 338.
Isolation favourable to selection, 97.

Japan, productions of, 324.
Java, plants of, 326.

Jones, Mr. J. M., on the birds of Bermu-
da, 340.

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Ju&sieu on classification, 363.

Kentucky, caves of, 125.
Kerguelen-land, flora of, 331, 347.
Kidney-bean, acclimatisation of, 129.
Kidneys of birds, 131.
Klrby on tarsi deficient in beetles, 123.
Knight, Andrew, on cause of variation, 14.
Kolreuter on the barberry, 92.

on sterility of hybrids, 218.

on reciprocal crosses, 228.

on crossed varieties of nicotiana, 239.

on crossing male and hermaphrodite
flowers, 392.

Lamarck on adaptive characters, 371.
Land-shells, distribution of, 346.

of Madeira, naturalised, 350.
Languages, classification of, 367.
Lapse, great, of time, 247.
Larvae, 382. ,
Laurel, nectar secreted by the leaves, 88.
Laws of variation, 120.
Leech, varieties of, 73.
LeguminossB, nectar secreted by glands, 88.
Lepidosircn, 100, 288.
Life, struggle for, 60.
Lingula, Silurian, 268.
Linnaeus, aphorism of, 360.
Lion, mane of, 84.

young of, striped, 382
Lobelia fulgens, 71, 92.
Lobelia, sterility of crosses, 221.
Loess of the Rhine, 335.
Lowness of structure connected with va-
riability, 135.
Lowness, related to wide distribution, 353.
Lubbock, Mr., on the nerves of coccus, 47.
Lucas, Br. P., on inheritance, 19.

on resemblance of child to parent-
242.

Lund and Clausen on fossils of Brazil, 296.
Lyell, Sir C., on the struggle for existence,
61.

on modern changes of the earth, 90.
on measure of denudation, 249.
on a carboniferous land-shell, 253.
on fossil whales- 265.
on strata beneath Silurian system,
268.

on the imperfection of the geological

record, 271.
on the appearance of species, 273.
on Barrande's colonies, 274.
on tertiary formations of Europe and

North America, 282.
on parallelism of tertiary formations,

2S7.

on transport of seeds by icebergs,
317.

on great alternations of climate, 332.
on the distribution of fresh-water

shells, 336.
on land-shells of Madeira, 350.
Lyell and Dawson on fossilised trees in
Nova Scotia, 259.

Macleay on analogical characters, 371.
Madeira, plants of, 100.

beetles of, wingless, 121.

Madeira, fossil land-shells of, 296.

birds of, 340.
Magpie tame in Norway, 189.
Maize, crossed, 238.
Malay Archipelago compared with

of, 344.
Malpighiacese, 363.
Mammae, rudimentary, 392.
Mammals, fossil, in seconds
265.
insular, 343.
Man, origin of races of, 178.
Manatee, rudimentary nails of, 394.
Marsupials of Australia, 107.

fossil species of, 296.
Martens, M-, experiment on seeds, 315.
Martin, Mr. W. C, on striped mules, 148.
Matteuchi on the electric organs of rays,
172.

Matthiola, reciprocal crosses of, 228.
Means of dispersal, 311.
Melipona domestica, 200.
Metamorphism of oldest rocks, 269.
Mice destroying bees, 72.

acclimatisation of, 128.
Migration, bears on first appearance of

fossils, 259.
Miller. Prof., on the cells of bees, 201.
Mirabilis, crosses of, 228.
Missel-thrush, 74.
Misseltoe, complex relations of, 11.
Mississippi, rate of deposition at mouth,

249.

Mocking-thrush of the Galapagos, 350.
Modification of species, how far applica-
ble, 418.
Moles, blind, 125.

Mongrels- fertility and sterility of, 236.

and hybrids compared, 239.
Monkeys, fossil, 265.
Monocanthus, 369.

Mons, Van, on the origin of fruit-trees, 32.

Moquin-Tandon on sea-side plants, 121.

Morphology, 377.

Mozart, musical powers of, 186.

Mud, seeds in, 337.

Mules, striped, 148.

Muller, Dr. F., on Alpine Australian

plants, 327.
Murchison, Sir R., on the formations of
Russia, 253.

on azoio formations, 268.

on extinction, 277.
Mustela vison, 161.
Myanthus, 369.
Myrmecocystus, 211.
Myrmtca, eyes of, 213.

Nails, rudimentary, 393.

Natural history, future progress of, 419.

selection, 77.

system, 360.
Naturalisation of forms distinct from the
indigenous species, 107.

in New Zealand, 180.
Nautilus, Silurian, 268.
Nectar of plants, 88.
Nectaries, now formed, 88.
Nelumbium luteum, 337.

Nests, variation In, 189.

Neuter insects, 209.
Newman. Mr., on bumble-bees, 72.
New Zealand, productions of, not perfect,
180.

naturalised products of, 294.
foaail birds of, 296.
glacial action in, 325.
crustaceans of, 328.
sign of, 328.

number of plants of, 339.

flora of, 347.
Nlcotiana, crossed varieties of, 239.

certain species very .sterile, 227.
Noble, Mr., on fertility of Khododendron,
222.

Nodales, pbosphatic, in azoic rocks, 269.

Oak, varieties of, 51.

Onites apelles, 123.

Orchis, pollen of, 173.

Organs of extreme perfection, 167.

electric, of fishes, 172.

of little importance, 174.

homologous, 377.

rudiments of, 391.
Omlthorhyncfaus, 100, 362.
Ostrich not capable of flight, 123.

habit of laying eggs together, 194.

American, two species of, 305.
Otter, habits of, how acquired, 161.
Ouzel, water, 166.

Owen, Prof., on birds not flying, 123.

on vegetative repetition, 135.

on variable length. of arms in ourang-
outang, 136.

on the swim-bladder of fishes, 171.

on electric organs, 172.

on fossil horse of La Plata, 279.

on relations of ruminants and pachy-
derms, 288.

on fossil birds of New Zealand, 296.

on succession of types, 296.

on affinities of the dugong, 361.

on homologous organs, 378.

on the metamorphosis of cephalo-
poda and spiders, 384.?

Pacific Ocean, faunas of, 304.
Paley on no organ formed to give pain,
179.

Pallas on the fertility of the wild stocks

of domestic animals, 224.
Paraguay, cattle destroyed by flies, 71.
Parasites, 194.
Partridge, dirt on feet, 316.
Parts greatly developed, variable, 136.

degrees of utility of, 179.
Paras major, 164.
Passiflora, 221.
Peaches in United States, 81.
Pear, grafts of, 231
Pelargonium, flowers of, 132.

sterility of, 222.
Pelvis of women, UK1 .
Peloria, 132.
Period, glacial, 318.
Petrels, habits of, 165.
Phastanns, fertility of hybrids, 224.
Pheasant, young, wild, 192.

Philippl on tertiary Bpecles in Sicily, 273.
Pictet, Prof., on groups of species sudden-
ly appearing, 264, 267.
on rate of organic change, 274.
on continuous succession of genera-
277.

on close alliance of fossils in con-
secutive formations, 293.
on embryological succession, 295.
Pierce, Mr., on varieties of wolves, 87.
Pigeons with feathered feet and akin be-
tween toes, 18.
breeds described, and origin of, 25.
breeds of, how produced, 41, 44.
tumbler, not being able to get oat of

egg, 83.
reverting to blue color, 144.
instinct of tumbling- 191.
carriers, killed by hawks, 315.
young of, 387.
Pistil, rudimentary, 392.
Plants, poisonous, not affecting certain
coloured animals, 18.-
selection applied to, 36.
gradual improvement of, 40.
not improved in barbarous countries,
40.

destroyed by insects, 66.

in midst of range, have to struggle

with other plants, 75.
nectar of, 87.
fleshy, on sea-shores, 121.
fresh-water, distribution of, 336.
low in scale, widely distributed, 353.
Plumage, laws of change in sexes of birds.
85.

Plums in the United States, 81.
Pointer dog, origin of, 38.

habits of, 190.
Poison not affecting certain coloured ani-
mals, 18.

Poison, similar effect of, on animals and

plants, 419.
Pollen of fir-trees, 181.
Poole, Col., on striped hemionus, 147.
Potamogeton, 337.

Prestwich, Mr., on English and French

eocene formations, 287.
Primrose, 51.

sterility of, 219.
Primula, varieties of, 51.
Proteolepas, 134.
Proteus, 127.

Psychology, future progress of, 423.

Quagga, striped, 149.
Quince, grafts of, 231.

Babbit, disposition of young, 192.
Races, domestic, characters of, 21.
Race-horses, Arab, 38.

English, 810.
Ramond on plants of Pyrenees, 320.
Ramsay, Prof., on thickness of the British
formations, 249.

on faults, 250.
Ratio of increase, 63.
Rats, supplanting each other, 74.

acclimatisation of,-128.

blind in cave, 126.

Rattle-snake, 179.

Reason and Lnstinct, 186.

Recapitulation, general, 398.

Reciprocity of crosses, 228.

Record, geological, imperfect, 245.

Rengger on flies destroying cattle, 70.

Reproduction, rate of, 63.

Resemblance to parents in mongrel and
hybrids, 241.

Reversion, law of inheritance, 20.
in pigeons to blue colour, 144,

Rhododendron, sterility of, 222.

Richard, Prof., on Aspicarpa, 363.

Richardson, Sir J., on structure of squir-
rels, 162.

on fishes of the southern hemisphere,
327.

Robinla, grafts of, 231.
Rodents, blind, 125.
Rudimentary organs, 391.
Rudiments important for classification,
362.

Sageret on grafts, 231.
Salmons, males fighting, and hooked jaws
of, 84.

Salt water, how far injurious to seeds, 312.
Baurophagus sulphuratus, 164.
Schloute on blind insects, 126.
Schlcgel on snakes, 131.
Se.*-water, how far injurious to seeds, 812.
Sebright, Sir J., on crossed animals, 25.

on selection of pigeons, 34.
8edgwick, Prof., on groups of species sud-
denly appearing, 264.
Seedlings destroyed by insects, 66
Seeds, nutriment in, 75.

winged, 133.

power of resisting salt water, 312.
in crops and intestines of birds, 315.
eaten by fish, 316, 337.
in mud, 337.
hooked, on islands, 341.
Selection of domestic products, 33.

principle not of recent origin, 36.
unconscious, 37.
natural, 77.
sexual, 83.

natural, circumstances favourable
to, 95.
Sexes, relations of, 83.
Sexual characters variable, 141.

selection, 83.
Sheep- Merino their selection, 35.

two sab-breeds unintentionally pro-
duced, 39.

mountain, varieties of, 73.
Shells. colours of, 121.

littoral, seldom embedded, 253.

rresh-water, dispersal of, 335.

of Madeira, 341.

land, distribution of, 346.
SUene, fertility of crosses, 227.
Sllliman, Prof., on.blind rat, 125.
Skulls of young mammals, 176, 380.
Slave-making instinct, 195.
Smith, Col. Hamilton. on striped horses,
148.

Mr. Fred.. on slave-making ants,
195.

Smith, Mr. Fred., on neuter tints, 212.
Mr., of Jordan Hill, on the c"
tion of coast-rocks, 248.
Snap-dragon, 145.

Somerville, Lord, on selection of sheep,
34.

Sorbus, grafts of, 231.

Spaniel, King Charles's breed, 38.

Species, polymorphic, 48.

common, variable, 54.

in large genera variable, 55.

groups of, suddenly appearing, 264,
268.

beneath Silurian formations, 268.
successively appearing, 273.
changing simultaneously throughout

the world, 282.
Spencer, Lord, on increase in size of cattle,

38.

Sphex, parasitic, 195.
Spiders, development of, 384.
Spitz-dog crossed with fox, 236.
Sports in plants, 16.
Sprengle, C. C, on crossing, 92.

on ray-fiorets, 132.
Squirrels, gradations in structure, 162.
Staffordshire, heath, changes in, 70.
Stag-beetles, fighting, 84.
Sterility from changed conditions of life,
16.

of hybrids, 218.
laws of, 225.
causes of, 232.
from unfavourable conditions, 234.
of certain varieties, 237.
St. Helena, productions of, 339.
St. Hilaire. Aug., on classification, 364.
St. John. Mr., on habits of cats, 86.
Sting of bee, 180.

Stocks, aboriginal, of domestic animals, 23.
Strata, thickness of. in Britain, 249.
Stripes on horses, 147.
Structure. degrees of utility of, 179.
Struggle for existence, 60.
Succession, geological, 273.
Succession of types in same areas, 295.
Swallow, one species supplanting another,
74.

Swim-bladder, 170.
System, natural, 360.

Tail of giraffe, 174.

of aquatic animals, 175.

rudimentary, 394.
Tarsi deficient, 123.
Tausch on umbelliferous flowers, 132.
Teeth and hair correlated, 131.

embryonic, traces of, in birds, 891.

rudimentary, in embryonic calf, 891,
416.

Tegetmeier, Mr., on cells of bees, 202, 207.
Temminck on distribution aiding classifi-
cation, 365.
Thouln on grafts, 231.
Thrush, aquatic species of, 166.

mocking, of the Galapagos, 350.

young of, spotted, 382.

nest of, 215.
Thuret, M., on crossed fusl, 228.
Thwaites, Mr., on acclimatisation, 128.
Horra del Fuego, doga of, 192.

plants of- 326, 329.
Timber-drift- 314.
Time, lapse of, 247.
Titmouse, 164.
Toads on islands, 342.
Tobacco, crossed varieties of, 239.
Tomes, Mr., on the distribution of bats,
343.

Transitions in varieties rare, 155.
Trees on islands belong to peculiar orders,
342.

with separated sexes, 93.
Trlfollum pratense, 71, 89.

incarnatum, 89.
Trlgonia, 281.
Trilobites, 268.

sudden extinction of, 281.
Troglodytes. 216.
Tucutucu, blind, 125.

Tumbler pigeons, habits of, hereditary,
191.
young of, 387.
Turkey-cock, brush of hair on breast, 85.
Turkey, naked skin on head, 176.

young, wild, 192.
Turnip and cabbage, analogous variations

of, 144.
Type, unity of, 184.

Types, succession of, in same areas, 295.

Udders enlarged by use, 17.

rudimentary, 392.
TJlex, young leaves of- 382.
UmbclliferaB, outer and innep florets of, 131.
Unity of type, 184.

Use, effects of, under domestication, 17.

effects of, in a state of nature, 122,
123,

Utility, how far important in the con-
struction of each part, 178.

Valenciennes on fresh-water fish, 335.
Variability of mongrels and hybrids, 241.
Variation under domestication, 14.

caused by reproductive system being

affected by conditions of life, 15.
under nature, 46.
laws of, 120.
Variations appear at corresponding ages,
20, 82.

analogous in distinct species, 144.
Varieties, natural, 46.

struggle between, 73.

domestic, extinction of, 104.

transitional, rarity of, 154.

when crossed, fertile, 236.

when crossed, sterile, 237.

classification of, 368.
Verbascum, sterility of, 222.

varieties of, crosaed, 238.
Verneuil, M. de, on the succession of spe-
cies, 284.
Viola tricolor, 71.

Volcanic islands, denudation of, 249.
Vulture, naked skin on head, 176.

Wading-blrds, 337.

Wallace, Mr., on origin of species, 10.

on law of geographical distribution,
310.

on the Malay Archipelago, 344.
Wasp, sting of, 180.
Water, fresh, productions of, 334.
Water-hen, 166.

Waterhouse, Mr., on Australian marsu-
pials, 108.
on greatly developed parts being

variable, 136.
on cells of bees, 200.
on general affinities, 373.
Water-ouzel, 166.

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

of British plants, 58.
on acclimatisation, 128.
on flora of Azores, 316.
on Alpine plants, 320, 327.
on rarity of intermediate varieties,

158.

Weald, denudation of, 250.
Web of feet in water-birds, 166.
West Indian islands, mammals of, 344.
Westwood on species in large genera being
closely allied to others, 57.
on the tarsi of Engidae, 142.
on the antennae of hymenopterous
insects, 362.
Whales, fossil, 265.
Wheat. varieties of, 105.
White Mountains, flora of, 318.
Wings, reduction of size, 123.

of insects homologous with bran-
chiae, 171.
rudimentary, in insects, 391.
Wolf crossed with dog, 191.

of Falkland Isles, 343.
Wollaston, Mr., on varieties of insects, 50.
on fossil varieties of land-shells in

Madeira, 53.
on colours of insects on sea-shore,
121.

on wingless beetles, 124.
on rarity of intermediate varieties,
158.

on insular insects, 339.
on land-shells of Madeira, natu-
ralised, 350.
Wolves, varieties of, 86.
Woodpecker, habits of, 165.

green colour of, 176.
Woodward, Mr., on the duration of spo-
ciflo forms, 257.
on the continuous succession of gen-
era, 276.
on the succession of types, 296.
World, specles changing simultaneously

throughout, 282.
Wrens, nest of, 215.

Youatt, Mr., on selection, 34.

on sub-breeds of sheep- 39.
on rudimentary horns in young cat-
tle, 394.

Zebra, strlpes on, 147.

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