I am about to endeavor to set forth the life and work of Sir William Siemens, who was not only an ardent scientific discoverer, but one whose work for the last five or six years has interested the general public to a degree that has perhaps never before been the case with any man so devoted to science as he was. Of him it may be said, without fear of contradiction, that he has, beyond all his contemporaries, promoted the practical application of scientific discovery to industrial purposes. It has also been said by one who had the privilege of his friendship, that “no one could know him without feeling how lovely his character was. Wonderful as were the qualities of his mind, they were equalled by the nobleness of his heart.” These two sentences, then, will serve to indicate my purpose. In telling, with necessary brevity, the story of the life of Sir William Siemens, I shall try to keep in view the fact that even his great powers, without his large heart, would never have produced the impression which he did upon the national mind. Hence, after I have given a sketch of some of the more important discoveries of the inventor, and their consequences to the national life, I shall, with the help of materials most kindly and liberally placed at my disposal by his family, try to show what manner of man he was, and what impression he made upon those who had the very great advantage of personal communion with him. Charles William Siemens was born at Lenthe in Hanover on April 4, 1823, and was one among many of a family eminent for their scientific knowledge and practical skill. The possession of such unusual talents by a whole family is rarer, perhaps, in the intellectual life of England than in that of Germany; at any rate, in the absence of definite statistics such as those compiled with so much care by Mr. Francis Galton, the general impression is that such is the case. It is not difficult to discern in the scientific career of the Brothers Siemens some prominent characteristics of their race; and in the life of Sir William, the sympathy of the German mind for general principles, and the tenacity with which it clings to them, are well illustrated, and stand out in strongly-marked contrast to the usual indifference of the average English mind to theoretic conclusions, as opposed to so-called practical ones. It would be well-nigh impossible to find among Englishmen one instance in which an inventor has been so confident of the possible utility of a few grand general principles, that he has worked out from them several great inventions; and that he felt himself justified in this confidence after years of hard work is evidenced by his own saying that “the farther we advance, the more thoroughly do we approach the indications of pure science in our practical results.”