About 1820 he united some patriotic friends into a society, called Amis de la verite.
He wrote an epic, Charlemagne, ou l'Eglise delivree (2 vols., 1814), also La Verite sur les Cent _Tours and Memoirs, which were not completed.
Malebranche was from that hour consecrated to philosophy, and after ten years' study of the works of Descartes he produced the famous De la recherche de la verite, followed at intervals by other works, both speculative and controversial.
His writings against Malebranche were collected under the title Dissertations sur la recherche de la verite, 1693.
The last book (which is three-fourths of the whole work) is chiefly an answer to the famous Protestant work entitled Le Traite de l'Eglise by Du Plessis Mornay; and in the second edition (1595) there is an elaborate reply to an attack made on the third Verite by a Protestant writer.
