A life-story such as that of Michael Faraday is both easy and difficult to tell—it is easy in that he passed a simple and unadventurous life; it is difficult, partly, perhaps, for the same reason, and partly because the story of his life-work is a story of the wonderful advance made in natural science during the first half of the present century. Any detailed account of that scientific work would be out of place in a biography such as the present, which aims at showing by the testimony of those who knew him and by an account of his relations with his fellow-men, how nobly unselfish, how simple, yet how grand and useful, was the long life of Michael Faraday.