Lesagef has shown that the height of certain plants is decreased by cultivation in a saline soil, and that the leaves of iLesage, Recherches exphrimentales sur les modifications de, feuilles chez les plantes maritimes, in Rev. gen.
See also Kuenen's National Religions and Universal Religions (Hibbert lectures) and Lagrange's Etudes sur les religions simitiques (2nd ed.).
About this time he conceived the idea of his Bibliotheque universelle de tous les auteurs ecclesiastiques, the first volume of which appeared in 1686.
It was during his imprisonment here that, "prive de toute espece de livres et de secours, surtout distrait par les malheurs de ma patrie et les miens propres," as he himself puts it, he began his researches on projective geometry which led to his great treatise on that subject.
In 1826, in his Memoire sur les roues hydrauliques a aubes courbes, he brought forward improvements in the construction of water-wheels, which more than doubled their efficiency.