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Baleen, i. 285.
Barberry, flowers of, i. 121.
Barrande, M., on Silurian colonies,
ii. 90.
—, on the succession of species,
ii. 103.
-—, on parallelism of palaeozoic
formations, ii. 106.
-—, on affinities of ancient species,
ii. 108.
Barriers, importance of, ii. 130.
Bates, Mr., on mimetic butterflies,
ii. 222, 223, 224.
Batrachians on islands, ii. 182.
Bats, how structure acquired, i.
218.
—, distribution of, ii. 184.
Bear, catching water-insects, i. 220.
Beauty, how acquired, i. 249; ii.
283.
Bee, sting of, i.255.
—, queen, killing rivals, i. 256.
—, Australian, extermination of,
i. 93.
Bees fertilising flowers, i. 90.
—, hive, not sucking the red
clover, i. 117.
—, Ligurian, i. 117.
—, hive, ceil-making instinct, i.
342.
—, variation in habits, i. 324.
—, parasitic, i. 336.
—, humble, cells of, i. 343.
Beetles, wingless, in Madeira, i. 169.
— with deficient tarsi, i. 168.
Bentham, Mr., on British plants, i.
58.
—, on classification, ii. 211.
Berkeley, Mr., on seeds in salt
water, ii. 142.
Bermuda, birds of, ii. 180.
Birds acquiring fear, i. 325.
—, beauty of, i. 252.
— annually cross the Atlantic, ii.

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Cabbage, varieties of crossed, i, 122.
Calceolaria, ii. 7, 8.
Canary-birds, sterility of hybrids,

ii. 9.
Cape de Verde islands, productions
of, ii. 189.
—, plants of, on mountains, ii.
1

Cape of Good Hope, plants of, i.
158; ii. 178.

Carpenter, Dr., on foraminifera, ii.
117.

Carthamus, i. 271.

Catasetum, i. 243; ii. 216.

Cats, with blue eyes, deaf, i. 13.

—, variation in habits of, i. 325.

- curling tail when going to
spring, i. 254.

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—, development of, ii. 244.
Cercopithecus, tail of i. 294.
Ceroxylus laceratus, i. 284.
Cervulus, ii. 9.
Cetacea, teeth and hair, 1.179.
—, development of the whale-
bone, i. 285.
Cetaceans, i. 285.
Ceylon plants of, ii. 164.
Chalk formation, ii. 100.
Characters, divergence of, i. 134.
—, sexual, variable, i. 185, 191.
—, adaptive or analogical, ii. 218.
Charlock, i. 94.
Checks, to increase, i. 83.
---, mutual, i. 86.
Chelae of Crustaceans, i. 300.
Chickens, instinctive tameness of,
i. 329.
Chironomus, its asexual reproduc-
tion, ii. 240.
Chthamalinae, ii. 59.
Chthamalus, cretacean species of,
ii. 81.
Circumstances favourable to selec-
tion of domestic £ i. 46.
— — to natural selection, i. 124.
Cirripedes capable of crossing, i. 124.
—, carapace aborted, i. 184.
—, their ovigerous frena, i. 232.
—, fossil, ii. 80.
—, larvae of, ii. 243.
Claparède, Prof, on the hair-clasp-
ers of the Acaridae, i. 239.
Clarke, Rev. W. B., on old glaciers
in Australia, ii. 159.
Classification, ii. 202.
Clift, Mr., on the succession of types,
ii. 121.
Climate, effects of in checking in-
crease of beings, i. 84
-, adaptation of, to organisms, i.
174.

Climbing plants, i. 230.
—, development of, i. 305.
Clover visited by bees, i. 117.
Cobites, intestine of, i. 229.
Cockroach, i. 93.
Collections, palaeontological, poor,
ii. 58.
Colour, influenced by climate, i. 165.
- in relation to attack by flies,
i. 248

Columba livia, parent of domestic
£ i. 26.

Colymbetes, ii. 174.

Compensation of growth, i. 182.

c:* flowers and seeds of, i.
179.

- outer and inner florets of, i.
270

—, male flowers of, ii. 257.
Conclusion, general, ii. 293.
Conditions, slight changes in, fa-
vourable to fertility, ii. 27.
Convergence of genera, i. 156.
Coot, i. 222.
Cope, Prof, on the acceleration or
retardation of the period of repro-
duction, i. 232.
Coral-islands, seeds drifted to, ii.
145.

- reefs, indicating movements of
earth, ii. 145.
Corn-crake, i. 223.
Correlated variation in domestic
productions, i. 13.
Coryanthes, i. 241.
Creation, single centres of, ii. 135.
Crinum, ii. 6.
Croll, Mr., on subaerial denudation,
ii. 53, 56.
—, on the age of our oldest for-
mations, ii. 83.
-, on , alternate Glacial periods
in the North and South, ii. 160.
Crosses, reciprocal, ii. 14.
Crossing of domestic animals, im-
portance in altering breeds, i. 23.
—, advantages of, i. 119, 120.
-, unfavourable to selection, i.
125.

Cruger, Dr., on Coryanthes, i. 241.
Crustacea of New Zealand, ii. 164.
Crustacean, blind, i. 171.
air-breathers, i. 238.
Crustaceans, their chelae, i. 300.
Cryptocerus, i. 359.
Ctenomys, blind, i. 170.
Cuckoo, instinct of, i. 319, 330.

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Dana, Prof., on blind cave-animals,

i. 172.
—, on relations of crustaceans of
Japan, ii. 158.
—, on crustaceans of New Zea-
land, ii. 164.
Dawson, Dr., on eozoon, ii. 85.
De Candolle, Aug. Pyr, on struggle
for existence, i. 77.
—, on umbelliferae, i. 181.
—, on general affinities, ii.228.
—, Alph., on the variability of
oaks, i. 62.
—, on low plants, widely dis-
persed, ii.,196.
—, on widely-ranging plants be-
ing variable, i. 67.
—, on naturalisation, i. 139.
—, on winged seeds, i. 181.
—, on Alpine species suddenly
becoming rare, i. 210.
—, on distribution of plants with
large seeds, ii.145.
—, on vegetation of Australia, ii.
167.
—, on fresh-water plants, ii. 174.
—, on insular plants. ii. 178.
Degradation of rocks, ii. 52.
Denudation, rate of, ii. 54.
— of oldest rocks, ii. 85.
— of granitic areas, ii. 64.
Development of ancient forms, ii.
116.
Devonian system, ii. 113.
Dianthus, fertility of crosses, ii. 13.
Dimorphism in plants, i. 55; ii. 29.
Dirt on feet of birds, ii. 148.
Dispersal, means of, ii. 140.
– during Glacial period, ii. 151.
Distribution, geographical, ii. 129.
—, means of, ii. 140.
Disuse, effect of, under nature, i.
167.
Uivergence of character, i. 134.

Mr. on the flight of

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—, - of crosses, ii. 35.
—, proportions of body in differ-
ent breeds, when young, ii. 247.
Domestication, variation under, i. 7.
Double flowers, i. 358.
Downing, Mr., on fruit-trees in
America, i. 104.
Dragon flies, intestines of, i. 229.
Drift-timber, ii. 145.
Driver-ant, i. 361.
Drones killed by other bees, i. 256.
Duck, domestic, wings of, reduced,
i. 12.
—, beak of, i. 285.
—, logger-headed, i. 218.
Duckweed, ii. 173.
Dugong, affinities of, ii. 206.
£ with deficient tarsi, i.
168.
Dytiscus, ii. 174.

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Eggs, young birds escaping from, i.
106.

Egypt, productions of, not modified,
i. 263.

Electric organs, i. 234.
Elephant, rate of increase, i. 80.
–, of Glacial period, i. 176.
Embryology, ii. 239.
Eozoon Canadense, ii. 84.
Epilepsy inherited, i. 167.
Existence, struggle for, i. 75.
—, condition of, i. 261.
Extinction, as bearing on natural
selection, i. 150.
— of domestic varieties, i. 145.
—, ii. 94.
Eye, structure of, i. 225.
—, correction for aberration, i. 255.
Eyes, reduction in moles, i. 170.

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Fabre, M., on hymenoptera fight-
ing, i. 108.
—, on parasitic sphex, i. 336.
—, on Sitaris, ii. 252.
Falconer, Dr., on naturalisation of
plants in India, i. 80.
—, on elephants and mastodons,
ii. 113.
– and Cautley, on mammals of
sub-Himalayan beds, ii. 122.
Falkland Islands, wolf of, ii. 183.
Faults, ii. 54.
Faunas, marine, ii. 131.
Fear, instinctive, in birds, i. 329.
Feet of birds, young molluscs ad-
hering to, ii. 174.
Fertilisation variously effected, i.
241, 252.
Fertility of hybrids, ii. 6.
-, from slight changes in condi-
tions, ii. 28.
– of crossed varieties, ii. 34.
Fir-trees destroyed by cattle, i. 88.
-, pollen of, i. 257.
Fish, flying, i. 218.
—, teleostean, sudden appearance
of, ii. 81.
, eating seeds, ii. 146, 175.
—, #: distribution of,
ii. 172.
Fishes, ganoid, now confined to
fresh water, i. 130.
—, electric organs of, i. 234.
-, ganoid, living in fresh water,

ii. 99.

Fishes, of southern hemisphere, ii.

164.
Flat-fish, their structure, i. 290.
Flight, powers of, how acquired, i.
218

Flint tools, proving antiquity of

man, i. 21.
Flower, Prof, on the Larynx, i. 297.
—, on Halitherium, ii. 108.
—, on the resemblance between
the jaws of the dog and Thyla-
cinus, ii. 220.
—, on the homology of the feet of
certain marsupials, ii. 232.
Flowers, structure of. in relation to
crossing, i. 114
—, of compositae and umbelli-
ferae, i. 179, 270.
—, beauty of, i. 252.
—, double, i. 358.
Flysch formation, destitute of or-
ganic remains, ii. 59.
Forbes, Mr. D., on glacial action in
the Andes, ii. 160.
—, E., on colours of shells, i. 165.
—, on abrupt range of shells in
depth, i. 210.
—ion poorness of palaeontological
collections, ii. 58.
—, on continuous succession of
genera, ii. 93.
—, on continental extensions, ii.
140, 141.
—, on distribution during Glacial
period, ii. 152.
—, on parallelism in time and
space, ii. 200.
Forests, changes in, in America, i.
91.
Formation, Devonian, ii. 113.
–, Cambrian, ii. 84.
Formations, thickness of, in Britain,
ii. 55.
—, intermittent, ii. 69.
Formica, rufescens, i. 336.
— sanguinea, i. 338.
—, flava, neuter of, i. 360.
Forms, lowly organised, long en-
during, i. 154.
Frena, ovigerous, of cirripedes, i.
232.
Fresh-water productions, dispersal
of, ii. 171.
Fries, on species in large genera
being closely allied to other spe-
cies, i. 71.
Frigate-bird, i. 222.

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Galapagos Archipelago, birds of
ii. 179.
—, productions of, ii. 188, 190.
Galaxias, its wide range, ii. 172.
Galeopithecus, i. 217.
Game, increase of, checked by ver-
min, i. 86.
Gärtner, on sterility of hybrids, ii.
3, 4, 11
—, on reciprocal crosses, ii. 15.
—, on crossed maize and verbas-
cum, ii. 37.
—, on comparison of hybrids and
mongrels, ii. 40, 41, 42.
Gaudry, Prof., on intermediate ge-
nera of fossil mammals in Attica,
ii. 107.
Geese, fertility when crossed, ii. 9,
10

–, upland, i. 222.
Geikie, Mr., on subaerial denuda-
tion, ii. 53.
Genealogy, important in classifica-
tion, ii. 212.
Generations, alternate, ii. 239.
Geoffroy St. Hilaire, on balance-
ment, i. 182.
—, on homologous organs, ii. 233.
—, Isidore, on variability of re-
peated parts, i. 184.
—, or correlation, in monstrosi-
ties, i. 13.
—, on correlation, i. 179.
—, on variable parts being often
monstrous, i. 190.
Geographical distribution, ii. 129.
Geography, ancient, ii. 303.
Geology, future progress of, ii. 302.
30% imperfection of the record, ii.
Gervais, Prof, on Typotherium, ii.

108.
Giraffe, tail of, i. 245.
–, structure of, i. 276.
Glacial period, ii. 151.

Glacial period, affecting the North
and South, ii. 158.
Glands, mammary, i. 295.
Gmelin, on distribution, ii. 151.
Godwin-Austen, Mr., on the Malay
Archipelago, ii. 74.
o: on compensation of growth,
1. 152.
£ i. £a. f
}ooseberry, of, ii. 19.
Gould, Dr. Aug. A., on land-shells,
ii. 186.
—, Mr., on colours of birds, i. 165.
-, on instincts of cuckoo, i. 833.
—, on distribution of genera of
birds, ii. 195.
Gourds, crossed, ii. 38.
Graba, on the tria lacrymas, i. 113.
Grafting, capacity of, ii. 18, 19, 20.
Granite, areas of denuded, ii. 64.
Grasses, varieties of, i. 137.
Gray, Dr. Asa, on the variability of
oaks, i. 62.
—, on man not causing variabil-
ity, i. 98.
—, on sexes of the holly, i. 116.
-, on trees of the United States,
i. 123.
—, on naturalised plants in the
United States, i. 139.
—, on aestivation, i. 272.
—, on Alpine plants, ii. 151.
—, on rarity of intermediate va-
rieties, i. 212.
—, Dr. J. E., on striped mule, i.
199.
Grebe, i. 221.
Grimm, on asexual reproduction, ii.
240.
Groups, aberrant, ii. 227.
Grouse, colours of, i. 104.
—, red, a doubtful species, i. 59.
Growth, compensation of, i. 182.
Günther, Dr., on flat-fish, i. 292.
—, on prehensile tails, i. 295.
—, on the fishes of Panama, ii.
131.
—, on the range of fresh-water
fishes, ii. 172.
—, on the limbs of Lepidosiren,
ii. 258.

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