71.
--------, boulders and glaciers of, 373.
----, South, no modern formations on west coast, 290.
Ammonites, sudden extinction of, 321.
Anagallis, sterility of, 247.
Analogy of variations, 159.
Ancylus, 386.
Animals, not domesticated from being variable, 17.
----, domestic, descended from several stocks, 19.
--------, acclimatisation of, 141.
---- of Australia, 116.
---- with thicker fur in cold climates, 133.
----, blind, in caves, 137.
----, extinct, of Australia, 339.
Anomma, 240.
Antarctic islands, ancient flora of, 399.
Antirrhinum, 161.
Ants attending aphides, 210.
----, slave-making instinct, 219.
----, neuter, structure of, 236.
Aphides, attended by ants, 210.
Aphis, development of, 442.
Apteryx, 182.
Arab horses, 35.
Aralo-Caspian Sea, 339.
Archaic, M. de, on the succession of species, 325.
Artichoke, Jerusalem, 142.
Ascension, plants of, 389.
Asclepias, pollen of, 193.
Asparagus, 359.
Aspicarpa, 417.
Asses, striped, 163.
Ateuchus, 135.
Audubon on habits of frigate-bird, 185.
---- on variation in birds'-nests, 212.
---- on heron eating seeds, 387.
Australia, animals of, 116.
----. dogs of, 215.
----, extinct animals of, 339.
----, European plants in, 375.
Azara on flies destroying cattle, 72.
Azores, flora of, 363.

B.

Babington, Mr., on British plants, 48.
Balancement of growth, 147.
Bamboo with hooks, 197.
Barberry, flowers of, 98.
Barrande, M., on Silurian colonies, 313.
---- on the succession of species, 325.
---- on parallelism of palaeozoic formations, 328.
---- on affinities of ancient species, 330.
Barriers, importance of, 347.
Batrachians on islands, 393.
Bats, how structure acquired, 180.
----, distribution of, 394.
Bear, catching water-insects, 184.
Bee, sting of, 202.
----, queen, killing rivals, 202.
Bees fertilising flowers, 73.
----, hive, not sucking the red clover, 95.
{492}
--------, cell-making instinct, 224.
----, humble, cells of, 225.
----, parasitic, 218.
Beetles, wingless, in Madeira, 135.
---- with deficient tarsi, 135.
Bentham, Mr., on British plants, 48.
----, on classification, 419.
Berkeley, Mr., on seeds in salt-water, 358.
Bermuda, birds of, 391.
Birds acquiring fear, 212.
---- annually cross the Atlantic, 364.
----, colour of, on continents, 132.
----, footsteps and remains of, in secondar