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First edition in book form of Monge's geometry lectures at the Ecole Normale, the first public course in descriptive geometry. Like those of the other professors, the lectures were taken down by stenographers and published in installments in the Journal des séances des écoles normales. Monge should be considered the true creator of descriptive geometry. He viewed descriptive geometry as a powerful tool for discovery and demonstration in various branches of pure and infinitesimal geometry, which had been partially abandoned because of the success of Cartesian geometry (see DSB IX, 475).