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Dogs, fertility of breeds together, | Falconer, Dr., on naturalisation of

228.

399.

of crosses, 240.
proportions of, when young,

Domestication, variation under, 7.
Downing, Mr., on fruit-trees in
America, 77.

Downs, North and South, 256.
Dragon-flies, intestines of, 171.
Drift-timber, 824.
Driver-ant, 216.

Drones killed by other bees, 182.
Duck, domestic, wings of, reduced,
10.

logger-headed, 163.
Duckweed, 846.

Dugong, affinities of, 373.
Dung-beetles with deficient tarsi,

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Eye, structure of, 168.

plants in India, 60.

800.

on fossil crocodile, 281.
on elephants and mastodons,

and Cautley on mammals of
sub-Himalayan beds, 305.
Falkland Island, wolf of, 353.
Faults, 255.

Faunas marine, 813.

Fear, instinctive, in birds, 190.
Feet of birds, young molluscs ad-
hering to, 846.
Fertility of hybrids, 224.

from slight changes in con.
ditions, 239.

of crossed varieties, 240.
Fir-trees destroyed by cattle, 66.
pollen of, 182.

Fish, flying, 164.

teleostean, sudden appearance

of, 273.

eating seeds, 325, 847.
fresh-water, distribution of,

844.

Fishes, ganoid, now confined to
fresh water, 97.

electric organs of, 173.
ganoid, living in fresh water

288.

of southern hemisphere, 337.
Flight, powers of, how acquired,
164.

Flowers, structure of, in relation
to crossing, 83.

- of compositæ and umbel.
liferæ, 131.

Forbes, E., on colours of shells,
120.

on abrupt range of shells in
depth, 157.

on poorness of palæonto-
logical collections, 258.

on continuous succession of
genera, 284.

on continental extensions,
320.

on distribution during glacial
period, 329.

on parallelism in time and
space, 868.

correction for aberration, 181. Forests, changes in, in America,

Eyes reduced in moles, 124.

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69.

Formation, Devonian, 299.
Formations, thickness of, in
Britain, 254.

Formations, intermittent, 269.
Formica rufescens, 190.
sanguinea, 197.

flava, neuter of, 215.
Frena, ovigerous, of cirripedes,
172.

Fresh-water productions, dispersal
of, 844.

Fries on species in large genera
being closely allied to other
species, 52.
Frigate-bird, 167.
Frogs on islands, 353.
Fruit-trees, gradual improvement
of, 84.

in United States, 77.
varieties of, acclimatised

in United States, 129.
Fuci, crossed, 232.

Fur, thicker in cold climates, 121.
Furze, 395.

Galapagos Archipelago, birds of,
351.

productions of, 358, 360.
Galeopithecus, 163.

Game, increase of, checked by
vermin, 63.
Gärtner on sterility of hybrids,
221, 222.

on reciprocal crosses, 232.
on crossed maize and ver-
bascum, 242.

on comparison of hybrids and
mongrels, 244.
Geese, fertility when crossed, 227.
upland, 167.
Genealogy important in classifica-
tion, 378.

Geoffroy St. Hilaire on balance-
ment, 133.

390.

on homologous organs,

Isidore, on variability of

repeated parts, 135.

on correlation in mon-

strosities, 11.

on correlation, 180.
on variable parts being
often monstrous, 140.
Geographical distribution, 805.
Geography, ancient, 438.
Geology, future progress of, 438.
imperfection of the record,
250.
Giraffe, tail of, 175.

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Hermaphrodites crossing, 87.
Heron eating seed, 348.
Heron, Sir R., on peacocks, 81.
Heusinger on white animals not
poisoned by certain plants, 11.
Hewitt, Mr., on sterility of first
crosses, 237.

Himalaya, glaciers of, 335.
plants of, 336.

Hippeastrum, 225.
Holly-trees, sexes of, 84.
Hollyhock, varieties of, crossed,
243.

Hooker, Dr., on trees of New
Zealand, 91.

on acclimatisation of Hima-
layan trees, 127.

on flowers of umbelliferæ,
181.

on glaciers of Himalaya, 335.
on algae of New Zealand, 387.
on vegetation at the base of
the Himalaya, 340.

on plants of Tierra del Fuego,
336, 839.

on Australian plants, 337,
359.

on relations of flora of South
America, 340.

on flora of the Antarctic
lands, 842, 359.

on the plants of the Gala-

pagos, 352, 357.
Hooks on bamboos, 177.

to seeds on islands, 352.
Horner, Mr., on the antiquity of
Egyptians, 17.

Horns, rudimentary, 408.
Horse, fossil, in La Plata, 286.
Horses destroyed by flies in La
Plata, 67.

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Icebergs transporting seeds, 326.
Increase, rate of, 59.
Individuals, numbers favourable
to selection, 92.

many, whether simultane-
ously created, 319.
Inheritance, laws of, 12.

at corresponding ages, 13, 78.
Insects, colour of, fitted for habi-
tations, 77.

sea-side, colours of, 120.
blind, in caves, 125.
luminous, 174.
neuter, 212.
Instinct, 186.

Instincts, domestic, 193.
Intercrossing, advantages of, 88.
Islands, oceanic, 349.

Isolation favourable to selection,
95.

Japan, productions of, 334.
Java, plants of, 336.

Jones, Mr. J. M., on the birds of
Bermuda, 351.

Jussieu on classification, 375.

Kentucky, caves of, 124.
Kerguelen-land, flora of, 342, 358.
Kidney-bean, acclimatisation of,

129.

Kidneys of birds, 130.

Kirby on tarsi deficient in beetles,
122.
Knight, Andrew, on cause of
variation, 7.

Kölreuter on the barberry, 89.

on sterility of hybrids, 221.
on reciprocal crosses, 282.
-on crossed varieties of nico-
tiana, 243

Kölreuter, on crossing male and
hermaphrodite flowers, 405.

Lamarck on adaptive characters,
884.
Land-shells, distribution of, 856.

of Madeira, naturalised, 862.
Languages, classification of, 880.
Lapse, great, of time, 253.
Larvæ, 395.

Lyell, Sir C., on transport of seeds
by icebergs, 326.

on great alternations of cli.
mate, 343.

on the distribution of fresh-
water shells, 346.

on land-shells of Madeira, 861.
Lyell and Dawson on fossilised
trees in Nova Scotia, 266.

Laurel, nectar secreted by the Macleay on analogical characters,

leaves, 83.

Laws of variation, 119.

Leech, varieties of, 70.

Leguminosæ, nectar secreted by

glands, 83.

Lepidosiren, 97, 296.
Life, struggle for, 56.

Lingula, Silurian, 275.

Linnæus, aphorism of, 872.

Lion, mane of, 80.

young of, striped, 395.
Lobelia fulgens, 68, 89.

Lobelia, sterility of crosses, 224.
Loess of the Rhine, 345.

Lowness of structure connected
with variability, 185.
Lowness, related to wide distribu-
tion, 364.

Lubbock, Mr., on the nerves of
coccus, 42.
Lucas, Dr. P., on inheritance, 12.
on resemblance of child to
parent, 247.

Lund and Clausen on fossils of
Brazil, 804.
Lyell, Sir C., on the struggle for
existence, 58.

on modern changes of the

earth, 86.

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384.

Madeira, plants of, 97.

beetles of, wingless, 128.

fossil land-shells of, 304.
birds of, 851.

Magpie tame in Norway, 191.
Maize, crossed, 242.

Malay Archipelago compared with
Europe, 268.

mammals of, 355,

Malpighiaceae, 875.

Mammæ, rudimentary, 404.
Mammals, fossil, in secondary
formation, 272.
insular, 853.

Man, origin of races of, 179.
Manatee, rudimentary nails of,
408.

Marsupials of Australia, 105.

fossil species of, 304.
Martens, M., experiment on seeds,

323.
Martin, Mr. W. C., on striped
mules, 149.

Matteucci, on the electric organs
of rays, 173.

Matthiola, reciprocal crosses of,

232.

Means of dispersal, 320.
Melipona domestica, 202.
Metamorphism of oldest rocks,
276.

Mice destroying bees, 68.

acclimatisation of, 128.
Migration, bears on first appear-
ance of fossils, 267.
Miller, Prof., on the cells of bees,

203.

Mirabilis, crosses of, 282.
Missel-thrush, 70. "

Mistletoe, complex relations of, 3.
Mississippi, rate of deposition at
mouth, 255.

Mocking thrush of the Galapagos,
361.

Modification of species, how far | Noble, Mr., on fertility of Rhodo-

applicable, 435.

Moles, blind, 124.

Mongrels, fertility and sterility
of, 240.

and hybrids compared, 244.
Monkeys, fossil, 272.
Monocanthus, 382.

Mons, Van, on the origin of fruit-
trees, 27.

Moquin-Tandon on sea-side plants,
120.

Morphology, 390.

Mozart, musical powers of, 188.
Mud, seeds in, 347.
Mules, striped, 149.

Müller, Dr. F., on Alpine Aus-
tralian plants, 337.

Murchison, Sir R., on the forma.
tions of Russia, 259.

on azoic formations, 275.
on extinction, 285.

Mustela vison, 161.
Myanthus, 382.

Myrmecocystus, 214.

Myrmica, eyes of, 216.

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dendron, 226.

Nodules, phosphatic, in zoic
rocks, 276.

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on electric organs, 173.
on fossil horse of La Plata,
286.

on relations of ruminants and
pachyderms, 295.

on fossil birds of New Zea-
land, 804.

on succession of types, 304.
on affinities of the dugong,
373.

on homologous organs, 390.
on the metamorphosis of
cephalopods and spiders, 397.

Pacific Ocean, faunas of, 318.
Paley on no organ formed to give
ain, 181.

Pallas on the fertility of the will
stocks of domestic animals, 228
Paraguay, cattle destroyed by
flies, 67.

Parasites, 196.

Partridge, dirt on feet, 326.
Parts greatly developed, variable,
136.

degrees of utility of 181.

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