“At one time it is arithmetic or geometry which must do him service in illustrating certain truths and relations; at another time it is physical and chemical laws, which he applies to illuminate moral and religious truths. And not only in scientific essays is this the case, or only in sermons preached before the university, but even in his English sermons he makes unhesitating use of such illustrations.”1 It is certain that he pursued these studies with such eagerness and success, that he soon obtained