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Besides other works on astronomy and chronology, Eratosthenes wrote a Geographica in three books, in which he first gave a history of geography up to date and then passed on to mathematical geography, the spherical shape of the earth, &c., &c. Apollonius of Perga was with justice called by his contemporaries the 'Great Geometer', on the strength of his great treatise, the Conics.

A pink-coloured woolly saussurea and Delphinium glaciale are two of the most lofty plants, and are commonly found from 17,500 feet to 18,000 feet. Besides some barren mosses several lichens grow on the top, as Cladonia vermicularis, the yellow Lecidea geographica and the orange L. miniata.

Tubingen, 1808: in octavo. Paris: 1808. It contains a series of descriptions of the different styles of scenery and remarkable objects in the vast regions he had visited, portrayed with all the vigour and accuracy for which the author is distinguished. XI. De Distributione Geographicâ Plantarum secundum Coeli Temperiem et Altitudinem Montium, Prolegomena. In octavo. Paris: 1817.

One other great merit of Eratosthenes is, that he first raised Geography to the rank of a science. His Geographica were an organic collection, the first the world had ever seen, of all the travels and books of earth-description heaped together in the Great Library, of which he was for many years the keeper.

His works, printed in that language at Rome, were afterwards translated into Latin, and printed at Paris, under the patronage of the famous Thuanus, chancellor of France, with the title of Geographica Nubiensis, containing an account or all the nations lying on the Senegal and Gambia.