_Foucault’s_ great countryman, _Ampère_ (died 1836), the celebrated investigator in the fields of electricity, was also estranged from the Christian religion, but, after passing through torturing doubts, he regained undisturbed possession of his Catholic faith, and was a pious Christian at the time of his brilliant discoveries. He had frequent intercourse with _A. F. Ozanam_, and the discussion almost without exception turned to God. Then _Ampère_ would cover his forehead with his hands, exclaiming: “How great God is! Ozanam! how great God is, and our knowledge is as nothing.” “This venerable head,” _Ozanam_ relates of his friend, “covered with honours and full of knowledge, bowed down before the mysteries of the faith; he knelt at the same altars where before him _Descartes_ and _Pascal_ worshipped humbly, beside the poor widow and the small child, who perhaps were less humble than he” (_A. F. Ozanam_, Oeuvres Complètes, X, 37, and VIII, 89). As he was dying, and _M. Deschamps_, director of the college of Marseille, began to read aloud some passages from the “Imitation of Christ,” the dying man remarked that he knew the book by heart. Another great discoverer in the domain of electricity, who had preceded _Ampère_, was _Volta_ (died 1827). Like his great fellow countryman, _Galvani_ (died 1798), who did not disdain to be a member of the third order of St. Francis, _Volta_ was a staunch Catholic; every day he recited the rosary. At Como, his home, he was daily seen to go to holy Mass and, on holidays, to the Sacraments. Those who passed his house on Saturdays saw a small lamp burning before the picture of the Blessed Virgin Mary over his door. If the servant forgot to light the lamp, _Volta_ did it himself. On Feast days, when visiting the parish church, the great electrician could be seen among the children, explaining the catechism to them.