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Frogs on islands, ii. 182.
Fruit-trees, gradual improvement

of, i. 42.
— in United States, i. 104.
—, varieties of, acclimatised in

United States, i. 176.
Fuci, crossed, ii. 15, 23.
Fur, thicker in cold climates, i. 166.
Furze, ii. 241.

G.
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 Attiea,
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, #: progress of, ii. 802.
—, 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.
Goethe, on compensation of growth,
i. 182.
Gomphia, i. 272.
Gooseberry, grafts of, ii. 19.
Gould, Dr. Aug. A., on land-shells,
ii. 186.
—, Mr., on colours of birds, i. 165.
—, on instincts of cuckoo, i. 333.
—, on distribution of genera of
birds, ii. 195.
Gourds, crossed, ii. 38.
Graba, on the Uria 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.

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Habit, effect of, under nature, i. 168.
—, diversified, of same species,
i. 219.
Häckel, Prof., on classification and
the lines of descent, ii. 231.
Hair and teeth, correlated, i. 179.
Halitherium, ii. 108.
Harcourt, Mr. E. W., on the birds of
Madeira, ii. 180. -
Hartung, 'M. on boulders in the
Azores, ii. 149.
Hazel-nuts, ii. 143.
Hearne, on habits of bears, i.220.
Heath, changes in vegetation, i.
8

Hector, Dr., on glaciers of New Zea-
land, ii. 159.
Heer, Oswald, on ancient cultivated
plants, i. 20. -
—, on plants of Madeira, i. 130.
Helianthemum, i. 272.
Helix pomatia, ii. 187.
—, resisting salt water, ii. 187.
Helmholtz, §. on the imperfection
of the human eye, i. 255.
Helosciadium, ii. 143.
Hemionus, striped, i. 202.
Hensen, Dr., on the eyes of Cepha-
lopods, i. 237.
Herbert, W., on struggle for exist-
ence, i. 77.
—, on sterility of hybrids, ii. 6.
Hermaphrodites crossing, i. 119.
Heron eating seed, ii. 176.
Heron, Sir R., on peacocks, i. 109.
Heusinger, on white animals poi-
soned by certain plants, i. 13.
Hewitt, Mr., on sterility of first
crosses, ii. 23.
Hildebrand, Prof., on the self-ste-
rility of Corydalis, ii. 7.
Hilgendorf, on intermediate varie-
ties, ii. 66.
Himalaya, glaciers of, ii. 159.
—, plants of, ii. 162.
Hippeastrum, ii. 7.
Hippocampus, i. 295.
Hofmeister, Prof., on the move-
ments of plants, i. 308.
Holly-trees, sexes of, i. 115.
Hooker, Dr., on trees of New Zea-
land, i. 123.
—, on acclimatisation of Hima-
layan trees, i. 174.
TTg,on flowers of umbelliferae, i.

—, on the position of ovules, i. 268.

Hooker, Dr., on glaciers of Himala-
ya, ii. 159.

—, on algae of New Zealand, ii.
164

—, on vegetation at the base of
the Himalaya, ii. 164.
—, on plants of Tierra del Fuego,
ii. 161.
—, on Australian plants, ii. 163,
190.
—, on relations of flora of Amer-
ica, ii. 167.
—, on flora of the Antarctic lands,
ii. 169, 189.
—, on the plants of the Gala-
pagos, ii. 181, 188.
—, on glaciers of the Lebanon,
ii. 159.
—, on man not causing variabil-
ity, i. 97.
—, on plants, of mountains of
Fernando Po, ii. 162.
Hooks on palms, i. 247.
— on seeds, on islands, ii. 181.
Hopkins, Mr., on denudation, ii. 63.
Hornbill, remarkable instinct of, i.
364.
Horns, rudimentary, ii. 261.
fiorse, fossii, in in Plata, ii. 96.
—, proportions of, when young,
ii. 247.
Horses destroyed by flies in Para-
guay, i. 89.
, striped, i. 199.
Horticulturists, selection applied by,

i. 37.
Huber, on cells of bees, i. 349.
—, P. On reason blended with
instinct, i. 320.
—, on habitual nature of instincts,
i. 320.
—, on slave-making ants, i. 336.
—, on Melipona domestica, i. 343.
Hudson, Mr., on the Ground-Wood-
pecker of La Plata, i. 221.
-—, on the Molothrus, i. 334.
Humble-bees, cells of, i. 343.
Hunter, J., on secondary sexual
characters, i. 185.
Hutton, Captain, on crossed geese,
ii. 10.
Huxley, Prof., on structure of her-
maphrodites, i. 124.
—, on the affinities of the Sirenia,
ii. 108.
—, on forms connecting birds and
reptiles, ii. 108.

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Kidney-bean, acclimatisation of, i.
1

Kidneys of birds, i. 178.
Kirby, on tarsi deficient in beetles,
i. 168.
Knight, Andrew, on cause of varia-
tion, i. 8.
Kölreuter, on Intercrossing, i. 119.
—, on the barberr , i. 121.
—, on sterility of hybrids, ii. 3, 4.
—, on reciprocal crosses, ii. 15.
—, on crossed varieties of nico-
tiana, ii. 38.
—, on crossing male and herma-
phrodite flowers, ii. 256.

L.
Lamarck, on adaptive characters, ii.
218

Lancelet, i. 154.

—, eyes of, i. 227.

Landois, on the development of the
wings of insects, i. 231.

Land-shells, distribution of, ii. 186.

—, of Madeira, naturalised, ii.
193

—, resisting salt water, ii. 187.
#. classification of, ii. 214.
Lankester, Mr. E. Ray, on Longe-
vity, i. 263.
—, on homologies, ii. 237.
Lapse, great, of time, ii. 51.
Larvae, ii. 241, 242, 243.
Laurel, nectar secreted by the leaves,
i. 114.
Laurentian formation, ii. 84.
Laws of variation, i. 164.
Leech, varieties of, i. 93.
Leguminosae, nectar secreted by
glands, i. 114.
Leibnitz' attack on Newton, ii. 294.
Lepidosiren, i. 130; ii. 109.
—, limbs in a nascent condition,
ii. 258.
Lewes, Mr. G. H., on species not
having off. in Egypt, i.263.
—, on the Salamandra atra, ii. 256.
—, on many forms of life having
been at first evolved, ii. 300.
Life, struggle for, i. 77.
Lingula, Silurian, ii. 83.
Linnaeus, aphorism of, ii. 205.
Lion, mane of, i. 109.
—, young of, striped, ii. 241.
Lobelia fulgens, i. 90, 121.
—, sterility of crosses, ii. 7.

Lockwood, Mr., on the ova of the
Hippocampus, i. 295.

Locusts too seeds, ii. 147.

Logan, Sir W., on Laurentian for-
mation, ii. 84.

Lowe, Rev. R. T., on locusts visiting
Madeira, ii. 147.

Lowness of structure connected with
variability, i. 184.

—, related to wide distribution, ii.

196.
Lubbock, Sir J., on the nerves of
coccus, i. 54.
—, on secondary sexual charac-
ters, i. 193.
—, on a diving hymenopterous
insect, i. 222.
—, on affinities, ii. 73.
—, on metamorphoses, ii. 239, 242.
Lucas, Dr. P., on inheritance, i. 14.
—, on resemblance of child to
parent, ii. 43.
Lund and Clausen, on fossils of
Brazil, ii. 121.
Lyell, Sir C., on the struggle for
existence, i. 77.
—, on modern changes of the
earth, i. 118.
—, on terrestrial animals not hav-
ing been developed on islands, i.
281.
—, on a carboniferous land-shell.
ii. 59.
—, on strata beneath Silurian sys-
tem, ii. 84.
—, on the imperfection of the geo-
logical record, ii. 88.
—, on the appearance of species,
ii. 88.
—, on Barrande's colonies, ii. 90.
—, on tertiary formations of
Europe and North America, ii.
101.

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M.

Macleay, on analogical characters,
ii. 218.
Macrauchenia, ii. 107.
M. Donnell, Dr., on electric organs,
i. 234.
Madeira, plants of, i. 130.
—, beetles of, wingless, i. 169.
— fossil land-shells of, ii. iși.
—, birds of, ii. 180.
§. tame in Norway, i. 325.
Males o i. 108.
Maize, crossed, ii. 37.
Malay Archipelago compared with
Europe, ii. 74.
—, mammals of, ii. 185.
Malm, on flat-fish, i. 291.
Malpighiaceae, small imperfect flow-
ers of, i. 269.
—, ii. 209.
Mammae, their development, i. 295.
—, rudimentary, ii.255.
Mammals, fossil, in secondary for-
mation, ii. 79.
—, insular, ii. 183.
Man, origin of, ii. 304.
Manatee, rudimentary nails of, ii.

260.
Marsupials of Australia, i. 140.
—, structure of their feet, ii. 232.
—, fossil species of, ii. 121.
Martens, M., experiment on seeds,
ii. 144.
Martin, Mr. W. C., on striped mules,
i. 201.
Masters, Dr., on Saponaria, i. 272.
Matteucci, on the electric organs of
rays, i. 234.
Matthiola, reciprocal crosses of, ii.
15.
Maurandia, i. 307.
Means of dispersal, ii. 140.
Melipona domestica, i. 343.
Merrell, Dr., on the American
cuckoo, i. 330.
Metamorphism of oldest rocks, ii. 85.
Mice destroying bees, i. 90.
—, acclimatisation of, i. 175.
—, tails of, i. 294.
Miller, Prof., on the cells of bees, i.
344, 350.
Mirabilis, crosses of, ii. 15.
Missel-thrush, i. 93.
Mistletoe, complex relations of, i. 3.
Mivart, Mr., on the relation of hair
and teeth, i. 179.

Mivart, Mr., on the eyes of cephalo-
pods, i. 237.
—, various objections to Natural
Selection, i. 275.
—, on abrupt modifications, i. 813.
—, on the resemblance of the
mouse and antechinus, ii. 218.
Mocking-thrush of the Galapagos,
ii. 193.
Modification of species not abrupt,
ii. 298.
Moles, blind, i. 170.
Molothrus, habits of, i. 384. ...
Mongrels, fertility and sterility of,
ii. 34.
— and hybrids compared, ii. 39.
Monkeys, fossil, ii. 79.
Monachanthus, ii. 216.
Mons, Wan, on the origin of fruit-
trees, i. 33.
Monstrosities, i. 51.
Moquin-Tandon, on sea-side plants,
i. 166.
Morphology, ii. 231.
Morren, on the leaves of Oxalis, i.

308.
Moths, hybrid, ii. 9.
Mozart, musical powers of, i. 321.
Mud, seeds in, ii. 175.
Mules, striped, i. 201.
Müller, Adolf, on the instincts of the
cuckoo, i. 331.
Müller, Dr. Ferdinand, on Alpine
Australian plants, ii. 163.
Müller, Fritz, on dimorphic crusta-
ceans, i. 55, 362.
—, on the lancelet, i. 154.
—, on air-breathing crustaceans,
i. 238.
—, on climbing plants, i. 307.
—, on the self-sterility of orchids,
ll. I.
—, on embryology in relation to
classification, ii. 210.
—, on the metamorphoses of crus-
taceans, ii. 245, 253.
—, on terrestrial and fresh-water
organisms not undergoing any
metamorphosis, ii. 250.
Multiplication of species not indefi.
nite, i. 157.
Murchison, Sir R., on the forma-
tions of Russia, ii. 60.
—, on azoic formations, ii. 84.
—, on extinction, ii. 94.
Murie, Dr., on the modification of
the skull in old age, i. 233.

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Nägeli, on morphological characters,
i. 266.
Nails, rudimentary, ii. 260.
Nathusius, Won, on pigs, i. 249.
Natural history, future progress of,
ii. 301.
— selection, i. 97.
— system, ii. 204.
Naturalisation of forms distinct
from the indigenous species, i. 138.
Naturalisation in New Zealand, i.
255.
Naudin, on analogous variations in
gourds, i.,195.
—, on hybrid gourds, ii. 38.
—, on reversion, ii. 41.
Nautilus, Silurian, ii. 83.
Nectar of plants, i. 114.
Nectaries, how formed, i. 114.
Nelumbium luteum, ii. 176.
Nests, variations in, i. 324, 355, 364.
Neuter insects, i. 359, 360.
Newman, Col., on humble-bees, i. 90.
New Zealand, productions of, not
perfect, i. 255.
—, naturalised products of, ii. 119.
—, fossil birds of, ii. 121.
—, glaciers of, ii. 159.
—, crustaceans of, ii. 164.
—, algae of, ii. 164,
—, number of plants of, ii. 178.
—, flora of, ii. 189.
Newton, Sir I., attacked for irre-
ligion, ii. 294.
—, Prof., on earth attached to a
partridge's foot, ii. 148.
Nicotiana, crossed varieties of, ii. 39.
—, certain species very sterile, ii.
14

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