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Abkriast groups, 373.
Abyssinia, plants of, 326.
Acciimatisation, 127.
Affinities of extinct species, 287.

of organlo beings, 358.
Agassis on Amblyopsls, 127.

on groups of species suddenly ap-
pearing, 204, 287.

on embryological succession, 205.

on tho glacial period, 310.

on embryological characters, 364.

on the embryos of vertebrates, 382.

on parallelism of embryological de-
velopment and geological succes-
sion, 390.
Algse of New Zealand, 327.
Alligators, males, fighting, 84.
Amblyopsis, blind fish, 127.
America, North- productions allied to
those of Europe, 323.

boulders and glaciers of, 325.

South, no modern formations on
west coast, 254.
Ammonites, sudden extinction of, 281.
Anagallis, sterility of, 219.
Analogy of variations, 143.
Ancylus, 336.

Animals, not domesticated from being

variable, 23.
domestic, descended from several

stocks, 24.
acciimatisation of, 129.
of Australia, 108.

with thicker fur in cold climates, 122.
blind, in caves, 125.
extinct, of Australia, 296.
Anomma, 213.

Antarctic islands, ancient flora of, 347.

Antirrhinum, 145.

Ants attending aphides. 188.

slave-making instinct, 195.
Ants, neuter, structure of, 209.
Aphides attended by ants, 188.
Aphis, development of, 384.
Aptervx, 163.
Arab horses, 38.

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Artichoke, Jerusalem, 129
Ascension, plants of, 839.
Ascieplas, pollen of, 173.
Asparagus, 313.
Aspicarpa, 363.
Asses, striped, 147.
Ateuchus, 123.

Audubon on habits of frigate-bird, 160

on variation in birds'-nests, 189.

on heron eating seeds, 338.
Australia, animals of, 108,

dogs of, 192.

extinct animals of, 296.

European plants in, 327.
Azara on flies destroying cattle, 70.
Azores, flora of, 316.

Babington, Mr., on British plants, 49.

Balancoment of growth, 133.

Bamboo with hooks, 176.

Barberry, flowers of, 92.

Barrande, M., on Silurian colonies, 274.

on the succession of species, 2S4.

on parallelism of palaeozoic forma
tlons, 287.

on affinities of ancient species, 288.
Barriers, importance of, 303.
Batraohlans on islands, 342.
Bats, how structure acquired, 163.

distribution of, 343.
Bear, catching water-Insects, 165.
Bee, sting of, 180.

queen, killing rivals, 180.
Bees fertilising flowers, 71.

hive, not sucking tho red clover
89.

hive- cell-making Instinct, 200.

humble, colls of, 200.

parasitic, 195.
Beetles, wingless, in Madeira, 124.

with deficient tarsi, 123.
Bentham, Mr., on British plants, 49.

on ciassification, 365.
Berkeley, Mr., on seeds iu saivwater, 312
Bermuda, birds of, 341.
Birds acqniring fear, 189.

annually cross the Atlantic, 317.

colour of, on continents, 121.

fossil, in caves of Brazil, 296

Birds of Madeira, Bermuda, and Gala
pagos, 34a
song of males, 84.
transporting seeds, 315.
waders, 337.
wingless, 123,163.

with traces of embryonic teeth, 301.
Bizcacha, 305.

affinities of, 373.
Bladder for swimming in fish, 170.
Blindness of cave animals, 126.
ltljth, Mr., on distinctness of Indian cat-
tie, 23.

on striped Hemlonus, 147.

on croused geese, 224.
Hoar, shoulder-pad of, 84.
Borrow, Mr., ou the Spanish pointer, 38.
Bury St. Vincent on Batrachians, 342.
Bosquet, M., on fossil Chthamalus, 266,
Boulders, erratic, on the Azores, 316.
Branchiae, 170.

Brent, Mr., on house-tumblers, 101.

on hawks killing pigeons, 315.
Brewer, Dr., on American cuckoo, 103.
Britain, mammals of, 344.
Bronn on duration of specific forms, 257.
Brown, Robert, on classification, Mt.
Buckman on variation in plants, 17.
Buzareinguee on sterility of varieties, 238.

Cabbage, varieties of, crossed, 03.

Caiceolaria, 222.

Canary-birds. sterility of hybrids, 223.

Capo do Verde islands. 347.

Cape of Good Hope, plants of, 102, 326.

Carrler-plgeoos killed by hawks, 315.

Cassinl on flowers of composite;, 131.

Catasetum, 360.

Cats, with blue eyes, deaf, 18.

variation in habits of, 86.

curling tail when going to spring, 170.
Cattie destroying fir-trees, 60.

destroyed by flies in La Plata, 70.

breeds of, locally extinct, 103.

fertility of Indian and European
breeds, 225.
Cave, inhabitants of, blind, 125.
Centres of creation, 307.
Cephalopoda), development of, 384.
Cervulus, 224.

Cotacea, teeth and hair, 131.
Ceylon, plants of, 326.
Chalk formation, 282.
Characters, divergence of, 103.

sexual, variable, 141.

adaptive or analogical, 371.
Charlock, 74.
Chocks to increase, 66.

mutual, 60.
Chickens, instinctive tameness of, 102.
Chthaiualina), 253.

Chthamalus, cretacean species of, Mo.
Circumstances favourable to selection of
domestic products, 42.

to natural selection, 05.
Cirri pedes capable of crossing, 05.

carapace aborted, 134.

their ovigerous frona, 172.

fossil, 266.

larvae of, 883.

Classification, 360.

Clift, Mr., on the succession of types, 206
Climate, effects of, in checking increase o'
beings, 67.
adaptation of, to organisms, 127.
Cobites, intestine of, 170.
Cockroach, 74.

Collections, palsMntological, poor, 252.
Colour, influenced by climate, 121.

in relation to attacks by flies, 177.
Columba livia, parent of domestic pigeons
27.

Colymbetes, 336.
Compensation of growth, 134.
Composite, outer and inner florets of, 131.

male flowers of, 392.
Conclusion, general, 410.
Conditions, slight changes in, favourable

to fertility, 235.
Coot, 160.

Coral-islands, seeds drifted to, 315.

reefs, indicating move merits of earth,
270.

Corn-crake, 160.

Correlation of growth in domestic produc-
tions, 18.
of growth, 130,177.
Cowslip, 51.

Creation, single centres of, 307.
Crinum, 221.
Crosses, reciprocal, 228.
Crossing of domestic animals, Importance
In altering breeds, 25.

advantages of, 01.

unfavourable to selection, 00.
Crustacea of New Zealand, 327.
Crustacean, blind, 125.
Cryptocerus, 211.
Ctcnomys, blind, 126.
Cuckoo, instinct of, 103.
Currants, grafts of, 231.
Currents of sea, rate of, 313.
Cuvier on conditions of existence, 184.

on fossil monkeys, 265.

Fred., on instinct, ISO.

Dana, Prof., on blind cnve-anlmals, 126.

istaceans of

on relations of c
324.

on crustaceans of New Zealand, 327.
De Cnndolle on struggle for existence, 01,

on umbelllfcra, 132.

on general affinities, 374.

Alph, on low plants, widely dis-
persed, 353.

on widely-ranging plants being va-
riable, M.

on naturalisation, 107.

on winged seeds, 133.

on Alpine species suddenly beeom
ing rare, 157.

on distribution of plants with large
seeds, 814.

on vegetation of Australia, 830.

on fresh-water plants, 336.

on insular plants, 330.
Degradation of coast rocks, 248.
Denudation, rate of, 260.

of oldest rocks, 269.
Development of ancient forms, 203,
Devonian system, 292.
Dianthus, fertility of crosses, 220.
Dirt on feet of birds, 316.
Dispersal, means of, 311.

during glacial period, 318.
Distribution, geographical, 302.

means of, 311.
Disuse, effects of, under nature, 122.
Divorgonoe of character, 103.
Division, physiological, of labour, 107.
Dogs, hairless, with imperfect teeth, 18.

descended from several wild stocks,
23.

domestic instincts of, 100.
inherited civilization of. 102.
fertility of breeds together, 224.
of crosses, 230.

proportions of, when young, 380.
Domestication, variation under, 14.
Downing, Mr., on fruit-trees in Amcrica,81.
Downs, North and South, 250.
Dragon-flies, intestines of, 170.
Drift-timber, 314,
Driver-ant. 213.

Drones killed by other bees, 180.
Duck, domestic, wings of, reduced, 17.

logger-headed, 163.
Duckweed, 336.
Dugong, affinities of, Mo.
Dung-beeties with deficient tarsi, 124.
Dyticus, 336.

Earl, Mr. W., on the Malay Archipelago,
844.

Ears, drooping, in domestic animals, 17.

Rudimentary, 304.
Earth, seeds in roots of trees, 314.
Eciton, 211.

Economy of organisation, 134.
Edentata, teeth and hair, 131.

fossil species of, 206.
Edwards, Milne, on physiological divisions
of labour, 107.

on gradations of structure, 173.

on embryologies! characters, 364.
Eggs, young birds escaping from, 83.
Electric organs, 172.
Elephant, rate of increase, 63,

of glacial period, 128.
Embryology, 381.
Existence, struggle for, 60.

conditions of, 184.
Extinction, 277.

as bearing on natural selection, 102.

of domestic varieties, 103.
Eye, structure of, 167.

correction for aberration, 180.
Eyes reduced in moles, 125.

Fabro, M., on parasitic sphex, 195.
Faiconer, Dr., on naturalisation of plants
in India, 64,

on fossil crocodile, 274.

on elephants and mastodons, 292,
Falkland Island, wolf of, 343.
Faults, 260.
Faunas, marine, 304.
Foar, instinctive, in birds, 189.
Feet of birds, young molluses adhering to,

I Fertility of hybrids, 221.

from slight changes in conditions,

235.

of crossed varieties, 236.
Fir-trees destroyed by cattle, 69.

pollen of, 181.
Fish, iVing, 163.

teieostean, sudden appearance of, 267

eating seeds, 337.

fresh-water, distribution of, 335.
Fishes, ganoid, now confined to fresh
water, 100.

electric organs of, 172.

ganoid, living in fresh water, 281.

of southern hemisphere, 827.
Flight, powers of, how acquired, 163.
Flowers, structure of, in relation to cross
ing, 91.

of compoeitse and umbellifersB, 131.
Forbes, E., on colours of shells, 121.

on abrupt range of shells in depth,
157.

on poorness of palaxmtological col-
lections, 252.

on continuous succession of genera,
276.

on continental extensions, 311.
on distribution during glacial period,
319.

on parallelism in time and spnco,356.
Forests, changes in, in America, 72.
Formation, Devonian, 292.
Formations, thickness of, in Britain, 240.

intermittent, 254.
Formica rufescene, 195.

sangulnea, 195.

flava, neuter of, 212.
Frena, ovigcrous, of cirripedes, 172.
Fresh-water productions, dispersal of,
334.

Fries on species in large genera being
closely allied to other species, tn.
Frigate-bird, 166.
Frogs on islands, 342.
Fruit-trees, gradual improvement of, 40.

in United States, 81.

varieties of, acelimatised in United
States, 129.
Fuel, crossed, 228.
Fur, thicker in cold climates, 132.
Furze, 382.

Galapagos Archipelago, birds of, Mo.

productions of, 347, 348.
Galeopithecus, 162.

Game, increase of, checked by vermin, W.
Gartner on sterility of hybrids, 219, 226.

on reciprocal crosses, 228.

on crossed maize and verbascum,
238.

on comparison of hybrids and mon
grels, 240.
Geese, fertility when crossed, 224.

upland, 166.
Genealogy important Jn classification, 370.
Geoffroy St. Hilaire on balancement, 133.

on homologous organs, 378.

Isidore, on variability of repeated
parts, 136.

on correlation in monstrosities, 18.

Geoffrey on correlation, 131

on variable parts being often mon-
strous, 140.
Geographical distribution, 302.
Geography, ancient, 422,
Geology, rut are progress of, 421.

imperfection of the record, 245.
Giraffe, tail of, 174.
Glacial period, 31S.
Gmelin on distribution, 318.
Gnathodon, fossil, 321.
GodwlQ-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,
94.

on naturalised plants in the United

States, 107.
on rarity of intermediate varieties,

158.

on Alpine plants, 318.
Dr. J. S., on striped mule, 149.
Grebe, 165.

Groups, aberrant, 373,
Grouse, colours of, 81.

red, a doubtful species, 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.
TTalr and teeth, correlated, 131.
Haroourt, Mr. B. V., on the birds of Ma-
deira, 340.

Ilartung, M., on boulders in the Azores,
817.

TTazel-nuts, 313.

Hearne on habits of bears, 165.

Heath, changes in vegetation, 70.

Heer, O., on plants of Madeira, 100.

Helix pomatia, 346.

Ilelosciadlum, 313.

Hemionus, striped, 147.

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

on sterility of hybrids, 220.
ITermaphrodites crossing, Oil
Heron eating seed, 838.
Heron, Sir K., on peacocks, 84.
Heusinger on white animals not poisoned

t) v certain plants, 16.
nowitt, Mr., on sterility of first crosses,
233.

Himalaya, glaciers of, 324.

plants of.326.
Hippoaatrum, 221.
Holly-trees, sexes of, 88.
Hollyhock, varieties of, crossed, 230.
Hooker, Dr., on trees of New Zealand, 04.

Hooker, Dr., on acelimatisation of ]

lavan trees, 127.
on flowers of umbellifcrte, 132.
on glaciers of Himalaya, 324.
on algae of New Zealand, 327.
on vegetation at the base of the

Himalaya, 329.
on plants of Tierra del Fuego, 326,

329.

on Australian plants, 327, 347.
on relations of flora of South
lea, 330.

on flora of the Antarctic land?, 341,
347.

on the plants of tho Galapagos, 541,
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.
Horees 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 of, 200.
Hunter, J., on secondary sexual charac-
ters, 136.

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

on embryologies! succession, 295.

on homologous organs, 381.

on the development of aphis, 334.
Hybrids and mongrels compared, 239.
Hybridism, 217.
Hydra, structure of, 170.

Tbla, 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,
8L

sea-side, colours of, 121.

blind, in caves, 126.

luminous, 173.

nouter, 209.
Instinct, 185.
Instincts, domestic, 190.
Intercrossing, advantages of, 90.
Islands, oceanic, 838.
Isolation favourable to selection, 97.

Japan, productions of, 324.
Java, plants of, 326.
Jones, Mr. J. M., on tho birds of
da, 840.

Juwsiou on classification, 363.

Kentucky, caves of, 125.
Kerguolen-land, flora of, 331, 347.
Kidney-bean, acelimatisation of, 120.
Kidneys of birds, 131.
Kirby 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.

Lcguminosae, 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 or 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 coceus, 47.
Lucas, Dr. 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,

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, Mo.
Lyell and Dawson on fossilised trees in

Nova Scotia, 259.

Macleay on analogical characters, 371 .
""Blra, plants of, 100.

beetles of, wingless, 124.

Madeira, fossil land-shol.s of, 296.

birds of. 340.
Magpie tame in Norway, 189.
Maize, crossed, 238.

Malay Archipelago compared with Eu-
rope, 262.

mammals of, 344.
Ma'pighiaceso, 363.
Mammae, rudimentary, 392.
Mammals, fossil, in secondary formation,
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.
Metamorphlsm of oldest rocks, 269.
Mice destroying bees, 72.

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

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

Mocklng-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 seaside plants, 121.

Morphology, 377.

Mozart, musical powers of, 186.

Mud, seeds In. 337. %

Mules, striped, 148.

M&ller, Dr. F., on Alpine Australian

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

on azoic formations, 268.

on extinction, 277.
Mustcla vison, 161.
Myanthus, 369.
Myrmecocystus, 211.
Myrmica, eyes of, 213.

Nails, rudimentary, 393.

Natural history, future progress of, 419.

selection, W.

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

In New Zealand, 180.
Nautilus, Silurian, 268.
Nectar of plants, 88.
Nectaries, how formed, 88.
Nolumbium luteum, 387.

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