r fur in cold climates
--blind, in caves
--extinct, of Australia

Anomma

Antarctic islands, ancient flora of

Antechinus

Ants attending aphides
--slave-making instinct
--neuters, structure of

Apes, not having acquired intellectual powers

Aphides attended by ants

Aphis, development of

Apteryx

Arab horses

Aralo-Caspian Sea

Archeopteryx

Archiac, M. de, on the succession of species

Artichoke, Jerusalem

Ascension, plants of

Asclepias, pollen of

Asparagus

Aspicarpa

Asses, striped
--improved by selection

Ateuchus

Aucapitaine, on land-shells

Audubon, on habits of frigate-bird
--on variation in birds' nests
--on heron eating seeds

Australia, animals of
--dogs of
--extinct animals of
--European plants in
--glaciers of

Azara, on flies destroying cattle

Azores, flora of

Babington, Mr., on British plants

Baer, Von, standard of Highness
--comparison of bee and fish
--embryonic similarity of the Vertebrata

Baker, Sir S., on the giraffe

Balancement of growth

Baleen

Barberry, flowers of

Barrande, M., on Silurian colonies
--on the succession of species
--on parallelism of palaeozoic formations
--on affinities of ancient species

Barriers, importance of

Bates, Mr., on mimetic butterflies

Batrachians on islands

Bats, how structure acquired
--distribution of

Bear, catching water-insects

Beauty, how acquired

Bee, sting of
--queen, killing rivals
--Australian, extermination of

Bees, fertilizing flowers
--hive, not sucking the red clover
--hive, cell-making instinct
--Ligurian
--variation in habits

Bees, parasitic
--humble, cells of

Beetles, wingless, in Madeira
--with deficient tarsi

Bentham, Mr., on British plants
--on classification

Berkeley, Mr., on seeds in salt-water

Bermuda, birds of

Birds acquiring fear
--beauty of
--annually cross the Atlantic
--colour of, on continents
--footsteps, and remains of, in secondary rocks
--fossil, in caves of Brazil
--of Madeira, Bermuda, and Galapagos
--song of males
--transporting seeds
--waders
--wingless

Bizcacha, affinities of

Bladder for swimming, in fish

Blindness of cave animals

Blyth, Mr., on distinctness of Indian cattle
--on striped Hemionus
--on crossed geese

Borrow, Mr., on the Spanish pointer

Bory St. Vinc