I may slip in here a quotation from Emerson. "In Newton," said Emerson, "science was as easy as breathing; he used the same wit to weigh the moon that he used to buckle his shoes; and all his life was simple, wise, and majestic. So it was in Archimedes--always self-same, like the sky. In Linnæus, in Franklin, the like sweetness and equality--no stilts, no tiptoe; and their results are wholesome and memorable to all men." What Lord Kelvin had done, and was still to do, could not be described by any writing of less than encyclopaedic scope, and a knowledge as wide and {110} deep as his own. Helmholtz may be quoted, as he has been quoted by many who attempted the larger task from a scientific standpoint. Helmholtz was his intimate friend. Helmholtz said: "He is an eminent mathematician, but the gift to translate real facts into mathematical equations, and vice versa, is, by far, more rare than to find a solution of a given mathematical problem, and in this direction he is most eminent and original." Kelvin's first published paper was a defence of the mathematician, Fourier. His second was on "The Uniform Motion of Heat in Homogeneous Solid Bodies, and Its Connection With The Mathematical Theory of Electricity." I think he was eighteen then. He was certainly showing the bent of his mind. Fifty or sixty years later he said, in a presidential address to the Royal Society: "Tribulation, not undisturbed progress, gives life and soul, and leads to success where success can be reached." I do not know what his tribulations were, but they may have been the tribulations of defeat. He may have faced many defeats, but he won more successes. And the world was more concerned with scientific discoveries during his career than it had been in the time of Count Rumford and Humphry Davy, whose work in disproving that heat is a material body had been forgotten because nobody seemed to think it more important than curious. Sometime in the eighteen-forties James Prescott Joule ascertained the dynamical equivalent of heat, and settled the fact that heat is a mode of motion. Kelvin may be said to have leaped to the side of his friend. {111}