=985.= I never come across one of Laplace’s “_Thus it plainly appears_” without feeling sure that I have hours of hard work before me to fill up the chasm and find out and show _how_ it plainly appears.--BOWDITCH, N. _Quoted by Cajori: Teaching and History of Mathematics in the U. S. (Washington, 1896), p. 104._ =986.= Biot, who assisted Laplace in revising it [The Mecánique Céleste] for the press, says that Laplace himself was frequently unable to recover the details in the chain of reasoning, and if satisfied that the conclusions were correct, he was content to insert the constantly recurring formula, “_Il est àisé a voir._” --BALL, W. W. R. _History of Mathematics (London, 1901), p 427._ =987.= It would be difficult to name a man more remarkable for the greatness and the universality of his intellectual powers than Leibnitz.--MILL, J. S. _System of Logic, Bk. 2, chap. 5, sect. 6._ =988.= The influence of his [Leibnitz’s] genius in forming that peculiar taste both in pure and in mixed mathematics which has prevailed in France, as well as in Germany, for a century past, will be found, upon examination, to have been incomparably greater than that of any other individual.--STEWART, DUGALD. _Philosophy of the Human Mind, Part 3, chap. 1, sect. 3._ =989.= Leibnitz’s discoveries lay in the direction in which all modern progress in science lies, in establishing order, symmetry, and harmony, i.e., comprehensiveness and perspicuity,--rather than in dealing with single problems, in the solution of which followers soon attained greater dexterity than himself. --MERZ, J. T. _Leibnitz, Chap. 6._