This volume attempts to give a short account of Herbert Spencer's life, an appreciation of his characteristics, and a statement of some of the services he rendered to science. Prominence has been given to his Autobiography, to his Principles of Biology, and to his position as a cosmic evolutionist; but little has been said of his psychology and sociology, which require another volume, or of his ethics and politics, or of his agnosticism-the whetstone of so many critics. Our appreciation of Spencer's services is therefore partial, but it may not for that reason fail in its chief aim, that of illustrating the working of one of the most scientific minds that ever lived, "whose excess of science was almost unscientific." The story of Spencer's life is neither eventful nor picturesque, but it commands the interest of all who admire faith, courage, and loyalty to an ideal. It is a story of plain living and high thinking, of one who, though vexed by an extremely nervous temperament, was as resolute as a Hebrew prophet in delivering his message. It is the story of a quiet servant of science, indifferent to conventional honours, careless about "getting on," disliking controversy, sensationalism, and noise, trusting to the power of truth alone, that it must prevail. Another aspect of interest is that Spencer was an arch-heretic, one of the flowers of Nonconformity, against theology and against metaphysics, against monarchy and against molly-coddling legislation, against classical education and against socialism, against war and against Weismann. So that we can hardly picture the man who has not some crow to pick with Spencer.