Age of the world.

Aggressive plants, introduction of.

Agricultural Society, experiments on potatoes.

Airy, H. letter to.

Albemarle Island, Darwin's collection of plants from. -volcanoes of.

Aldrovanda.

Alerse ("Alerce"), occurrence in Chiloe.

Algae, movement of male-cells to female organ.

Alisma, F. Muller's observations on. -submerged flowers of.

Alisma macrophylla, circumnutation of.

Allbutt, Prof. Clifford, on sperm-cells.

Allen, Grant, review by Romanes of his "Physiological Aesthetics."

Allen, J.A., on colours of birds. -on mammals and birds of Florida.

Allogamy, use of term.

Almond, seedling peaches resembling.

Alopecurus pratensis, fertilisation of.

Alpine floras, Arctic and. -of Azores, Canaries and Madeira. -absence of, in southern islands. -Ball on origin of flora. -Darwin's work on. -of United States. -existence prior to Glacial period. -Ice-action in New Zealand, and. -Ball on origin of.

Alpine insects.

Alpine plants. -change due to transplanting. -slight change in isolated forms. -as evidence of continental land at close of Glacial period.

Alps, Australian. -Murchison on structure of. -submergence. -Tyndall's book on.

Alternate generations, in Hydrozoa.

Amazonia, Insects of.

Amazons, L. Agassiz on glacial phenomena in valley of. -L. Agassiz on geology of. -Bates on lepidoptera of. -sedimentation off mouth of.

Amber, extinct plants preserved in.

Amblyopsis, a blind cave-fish, effect of conditions on.

Ameghino, Prof., discovery of Neomylodon Listai.

America (North), are European birds blown to? -Falconer on elephants. -fauna and flora of Japan and. -flora of. -mammalian fauna. -introduction of European weeds. -subsidence during Glacial period. -western European plants and flora of. -contrast during Tertiary period between South and. -former greater distinction between fauna of South and. -glaciation of South and. -Rogers on coal-fields.

America (South), Bollaert's "Antiquities" of. -Araucarian fossil wood from. -Carabi of. -elevation of coast. -fauna of. -floras of Australia and. -geology of. -Darwin's "Geological Observations" on. -deposition of sediment on coast. -European plants in. -frequency of earthquakes. -D. Forbes on geology of. -W. Jameson on geology of. -D'Orbigny on. -volcanic eruptions. -Wallace opposed to continent uniting New Zealand, Australia and.

American War.

Ammonia, Darwin's work on effect on roots of carbonate of.

Ammonites, degeneration of. -reversion. -of S. America.

Amsinckia.

Amsinckia spectabilis, dimorphism of.

Anacamptis (=Orchis pyramidalis), fertilisation of.

Anacharis (=Elodea Canadensis), spread of.

Analogy, difference between homology and.

Anamorphism, Huxley on.

Anatifera, illustrating difficulty in nomenclature.

Anatomy of Vertebrata, Owen's attack on Darwin and Lyell in.

"Ancient Sea Margins," by R. Chambers.

Anderson-Henry, Isaac (1799?-1884): of Edinburgh, was educated as a lawyer, but devoted himself to horticulture, more particularly to experimental work on grafting and hybridisation. As President of the Botanical Society of Edinburgh he delivered two addresses on "Hybridisation or Crossing of Plants," of which a full abstract was published in the "Gardeners' Chronicle," April 13th, 1867, page 379, and December 21st, 1867, page 1296. See obit. notice in "Gardeners' Chronicle," September 27th, 1884, page 400. -letter to.

Andes, Darwin on geology of. -high-road for European plants. -comparatively recent origin.

Anemophilous plants, Delpino's work on.

Angiosperms, origin of.

Angraecum sesquipedale, Duke of Argyll on.

Animal Intelligence, Romanes on.

Animals, difference between plants and. -resemblance to plants.

Annuals, adapted to short seasons. -Hildebrand on percentages of.

Anoplotherium, occurrence in Eocene of S. America.

Ansted, David Thomas, F.R.S. (1814-80): Fellow of Jesus College, Cambridge, Professor of Geology at King's College, London, author of several papers and books on geological subjects (see "Quart.

Charles Darwin

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