Helix pomatia, 353.

Helmholtz, M., on the imperfection
of the human eye, 163.
Helosciadium, 325.
Hemionus, striped, 128.

Hensen, Dr., on the eyes of Cepha-
lopods, 152.

Herbert, W., on struggle for exist-
ence, 49.

on sterility of hybrids, 238.
Hector, Dr., on glaciers of New Zea-
land, 335.

Hermaphrodites crossing, 76.
Helix, resisting salt water, 353.
Heron eating seed, 346.
Heron, Sir R., on peacocks, 70.
Heusinger, on white animals
soned by certain plants, 9.
Hewitt, Mr., on sterility of first
crosses, 249.

poi-

Hildebrand, Prof., on the self-ste-
rility of Corydalis, 238.
Hilgendorf, on intermediate varie-
ties, 275.

Himalaya, glaciers of, 335.

-, plants of, 337.

Hippeastrum, 238.
Hippocampus, 189.

Hofmeister, Prof., on the movements
of plants, 197.
Holly-trees, sexes.of, 73.

Hooker, Dr., on trees of New Zea-
land, 78.

on acclimatisation of Hima-
layan trees, 112.

-, on flowers of umbelliferæ, 116.
on the position of ovules, 172.
on glaciers of Himalaya, 335.
on algæ of New Zealand, 338.

on vegetation at the base of
the Himalaya, 338.

on Australian plants, 337, 355.
on relations of flora of Ame-

Hybridism, 235.

Hydra, structure of, 147.

Hymenoptera, fighting, 69.

Hymenopterous insect, diving, 142.
Hyoseris, 173.

Kentucky, caves of, 111.
Kerguelen-land, flora of, 341, 354.
Kidney-bean, acclimatisation of, 114.
Kidneys of birds, 115.

Kirby, on tarsi deficient in beetles,
108.

Knight, Andrew, on cause of varia-
tion, 5.

Kölreuter, on Intercrossing, 76.
on the barberry, 77.

-, on sterility of hybrids, 237.
on reciprocal crosses, 243.

on crossed varieties of nico-
tiana, 258.

on crossing male and herma-
phrodite flowers, 397.

L.

Lamarck, on adaptive characters,
373.

Lancelet, 99.

—, eyes of, 145.

Landois, on the development of the
wings of insects, 148.
Land-shells, distribution of, 353.

of Madeira, naturalised, 357.
resisting salt water, 353.
Languages, classification of, 371.
Lankester, Mr. E. Ray, on Longevity,

169.

-, on homologies, 385.

Lapse, great, of time, 266.
Larvæ, 388, 389.

Laurel, nectar secreted by the leaves,
73.

Laurentian formation, 287.
Laws of variation, 106.
Leech, varieties of, 59.

Leguminosæ, nectar secreted
glands, 73.

Leibnitz' attack on Newton, 421.
Lepidosiren, 83, 303.

by

limbs in a nascent condition,
398, 399.

Lewes, Mr. G. H., on species not hav-
ing changed in Egypt, 169.

-, on the Salamandra atra, 397.
on many forms of life having
been at first evolved, 425.
Life, struggle for, 49.
Lingula, Silurian, 286.
Linnæus, aphorism of, 365.
Lion, mane of, 69.

-, young of, striped, 388.
Lobelia fulgens, 57, 77.

sterility of crosses, 238.
Lockwood, Mr., on the ova of the
Hippocampus, 189.

Locusts transporting seeds, 327.
Logan, Sir W., on Laurentian forma-
tion, 287.

Lowe, Rev. R. J., on locusts visiting
Madeira, 327.

Lowness of structure connected with
variability, 118.

related to wide distribution,

359.
Lubbock, Sir J., on the nerves of
coccus, 35.

on secondary sexual characters,
124.

on a diving hymenopterous
insect, 142.

on affinities, 280.

on metamorphoses, 386, 389.
Lucas, Dr. P., on inheritance, 9.

Lucas, Dr. P., on resemblance of child

to parent, 261.

Lund and Clausen, on fossils of
Brazil, 310.

Lyell, Sir C., on the struggle for
existence, 49.

on modern changes of the
earth, 75.

on terrestial animals not having
been developed on islands, 180.
on a carboniferous land-shell,
271.

on strata beneath Silurian
system, 287.

on the imperfection of the
geological record, 289.

on the appearance of species,
289.

on Barrande's colonies, 291.

on tertiary formations of
Europe and North America, 298.

on parallelism of tertiary for-
mations, 301.

on transport of seeds by ice-
Dergs, 328.

on great alternations of cli-
mate, 342.

on the distribution of fresh-
water shells, 345.

on land-shells of Madeira,

357.
Lyell and Dawson, on fossilized trees
in Nova Scotia, 278.
Lythrum salicaria, trimorphic, 254.

rays, 150.

Matthiola, reciprocal crosses of, 244.
Maurandia, 197.

Means of dispersal, 323.

Mellipona domestica, 220.

Merrell, Dr., on the American cuckoo,
212.

Metamorphism of oldest rocks, 287.
Mice destroying bees, 56.

acclimatisation of, 113.
tails of, 189.

Miller, Prof., on the cells of bees,
221, 224.

Mirabilis, crosses of, 243.
Missel-thrush, 59.

Mistletoe, complex relations of, 2.
Mivart, Mr., on the relation of hair
and teeth, 115.

151.

on the eyes of cephalopods,

various objections to Natural
Selection, 174.

-, on abrupt modifications, 201.
on the resemblance of the
mouse and antechinus, 373.
Mocking-thrush of the Galapagos,
357.

Modification of species not abrupt,
424.

Moles, blind, 110.

Molothrus, habits of, 215.

Mongrels, fertility and sterility of.

255.

and hybrids compared, 259
Monkeys, fossil, 284, 285.
Monachanthus, 372.

Mons, Van, on the origin of fruit
trees, 21.