Could there be a more conclusive testimony to his worth than this from a stranger? and if French geographers are excelled in these days by those of Germany and England, is it not consolatory and encouraging to them to know, that they have excelled in a science, in which they are now struggling to regain their former superiority?
Delisle lived to witness the success of his pupil, J. B. d'Anville. If the latter is inferior to Adrian Valois in the matter of historical science, he deserved his high fame for the relative improvement of his outlines, and for the clear and artistic appearance of his maps.
"It is difficult," says M. E. Desjardins, in his "Geographie de la Gaule Romaine," "to understand the slight importance which has been attributed to his works as a geographer, mathematician, and draughtsman." The latter more especially do justice to his great merit. D'Anville was the first to construct a map by scientific methods, and that of itself is sufficient glory. In the department of historical geography, D'Anville exhibited unusual good sense in discussion, and a marvellous topographical instinct for identifications, but it is well to remember that he was neither a man of science, nor even well versed in classic authorities. His most beautiful work is his map of Italy, the dimensions of which, hitherto exaggerated, extended from the east to the west in accordance with the ideas of the ancients.
In 1735, Philip Buache, whose name as a geographer is justly celebrated, inaugurated a new method in his chart of the depths of the English Channel, by using contour levels to represent the variations of the soil.
Ten years later d'Après De Mannevillette published his "Neptune Oriental," in which he rectified the charts of the African, Chinese, and Indian coasts. He added to it a nautical guide, which was the more precious at this period, as it was the first of the kind. Up to the close of his life he amended his manual, which served as a guide for all French naval officers during the latter part of the eighteenth century.
Of English astronomers and physicists, Hally was the chief. He published a theory of "Magnetic Variations," and a "History of the Monsoons," which gained for him the command of a vessel, that he might put his theory into practice.
That which D'Après achieved for the French, Alexander Dalrymple accomplished for the English. His views, however, bordered on the hypothetical, and he believed in the existence of an Antarctic Continent.
He was succeeded by Horsburgh, whose name is justly dear to navigators.
We must now speak of two important expeditions, which ought to have settled the animated discussion as to the shape of the earth. The Academy of Sciences had despatched a mission to America, to compute the arc of the meridian at the Equator. It was composed of Godin, Bouguer, and La Condamine.
It was decided to entrust a similar expedition to the North to Maupertuis.