Deluo's earnestness in availing himself of his geological observations to prove the veracity of the Mosaic narrative involved him in contro versial correspondence with several of his contemporaries, and par ticularly with Dr. Teller of Berlin : ' Lettres sur le Christianisme, addressaes an Dr. Teller,' 1801; 'Correspondence particuliere entre le Doeteur Teller et J. A. Deltic,' in French and German, 1803-1 ; and also with Professor Reimarus of Hamburg, Anuonce d'un Ouvrage de M. J. A. Reimarus sur Is Formation du Globe, par J. A. Deltic,' Hanover, 1803. But though Deluc was earnest in his religions conviction, and in supporting it by arguments, his spirit was far from being intolerant, as he shows in numerous passages of his works, and especially in his Discours sur la Toldrance! in tho first volume of the ' Histoire de la Terre et de PlIontme.' Ile was a great admirer of Bacon, and wrote 'Pracis de la Philosophie de Bacon, ct des Progres qu'ont fait lea Sciences Naturelles par see Preceptea of son Example,' 2 vols. Svo, l'aris, 1802. Ile wrote also on education Lettres sur ]'Education lieligieuse de l'Enfanco, prectic16ce et suivien de dataiLs historiques,' 8vo, 1799; besides many other memoirs, treatises, &c.,
which appeared in the ' Journal dca ScaVens," Transactions Philos°. phiques! end other scientific journals, French, English, and German.. lie was a member of the Royal Societies of Loudon, Dublin, and Gottingen, and correspondent of the academies of Paris, Montpellier, .16. Ito was appointed in 1798 professor of philosophy and geology in the University of Gottingen. Ito passed several years in Germany, at Berlin, Ilanover, Brunswick, &c. After the battle of Jena he returned to England, where he passed the remainder of his life, chiefly at Windsor, where his situation of reader to the queen gave him a free access to the royal family, by the members of which he was much respected. Ho died at Wiudsor, November 1817, in his ninety-first year. His brother and fellow-observer, Guillaume Antoine Deluc, died at Geneva in 1812, and left a rich collection of mineralogy, will& was increased by his son Andra Deluo, who wrote an Histoire du Passage des Alpes par Annibal,' Geneva, 1818.