Food, as determining number of species.

Foraminifera.

Forbes, D., on the Cordilleras. -on elevation in Chili. -on nitrate of soda beds in S. America.

Forbes, Edward, F.R.S. (1815-1854): filled the office of Palaeontologist to the Ordnance Geological Survey, and afterwards became President of the Geological Society; in 1854--the last year of his life--he was appointed to the chair of Natural History in the University of Edinburgh. Forbes published many papers on geological, zoological, and botanical subjects, one of his most remarkable contributions being the well-known essay "On the Connexion between the Distribution of the Existing Fauna and Flora of the British Isles and the Geological Changes which have affected their area" ("Mem. Geol. Surv." Volume I., page 336, 1846). (See "Proc. Roy. Soc." Volume VII., page 263, 1856; "Quart. Journl. Geol. Soc." Volume XI., page xxvii, 1855, and "Ann. Mag. Nat. Hist." Volume XV., 1855. -on flora of Azores. -on Chambers as author of the "Vestiges." -on continental extension. -Darwin opposed to his views on continental extension. -Darwin's opinion of. -Article on distribution. -on continuity of land. -on plant-distribution. -introductory lecture as professor in Edinburgh. -on former lower extension of glaciers in Cordillera. -lecture by. -letter to Darwin from. -on Madagascar insects. -on post-Miocene land. -Polarity theory. -on British shells. -too speculative. -on subsidence. -visits Down. -mentioned. -royal medal awarded to. -essay on connection between distribution of existing fauna and flora of the British Isles and geological changes.

Forbes, H.O., on Melastoma.

Force and Matter, Huxley on.

Forel, Auguste: the distinguished author of "Les Fourmis de la Suisse," Zurich, 1874, and of a long series of well-known papers. -on ants and beetles. -author of "Les Fourmis de la Suisse." -letter to.

Forfarshire, Lyell on glaciers of.

"Forms of Flowers," De Candolle's criticism of Darwin's. homomorphic and heteromorphic unions described in.

Forsyth-Major, zoological expedition to Madagascar.

"Fortnightly Review," Huxley's article on Positivism. Romanes on Evolution.

Fossil Cephalopods, Hyatt on.

Fossil corals.

Fossil plants, small proportion of. of Australia. sudden appearance of Angiosperms indicated by.

Fossil seeds, supposed vivification of.

Fossils as evidence of variability.

Fournier, E., De la Fecundation dans les Phanerogames.

Fowls, difference in sexes. -purred female.

Fox, tails of, used by Esquimaux as respirators.

Fox, Rev. W. Darwin.

Foxglove, use of hairs in flower.

France, edition of "Origin" in. -opinion favourable to Darwin's views in. -birth-rate.

Franco-Prussian war, opinion in England. -Science retarded by.

Frank, Albert Bernhard (1839-1900): began his botanical career as Curator of the University Herbarium, Leipzig, where he afterwards became Privatdocent and finally "Ausserordentlicher Professor." In 1881 Frank was appointed Professor of Plant-Physiology in the Landwirthschaftliche Hochschule, Berlin. In 1899 he was appointed to the Imperial Gesundheits-Amt in Berlin, and raised to the rank of Regierungsrath. Frank is chiefly known for his work on "The Assimilation of Free Nitrogen, etc.," and for his work on "The Diseases of Plants" ("Die Krankheiten der Pflanzen," 1880). It was his brilliant researches on growth-curvature ("Beitrage zur Pflanzen-physiologie," 1868, and "Die Naturlichen wagerechte Richtung von Pflanzen-theilen," 1870) which excited Darwin's admiration. -Darwin's admiration for his work.

Franklin, Sir J., search expedition.

Fraser, G., letter to.

"Fraser's Magazine," article by Hopkins. -article by Galton on twins. -Huxley on review in.

Freemasons' Tavern, meeting held at.

Freewill, a preordained necessity.

Freke, Dr., paper by.

Freshwater, Bee-orchis at.

Freshwater fauna, ocean faunas compared with. -poverty of. -preservation of.

Friendly Islands, rats regarded as game.

Fringillidae, colour and sexual selection.

Charles Darwin

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