To have placed Psychology and Ethics on a scientific basis in harmony with the discoveries of the century is a truly great achievement. Many years have now passed away since Herbert Spencer claimed the whole domain of knowledge as his own, and undertook to revise, in accordance with the latest lights, the whole sphere of philosophy. What must have seemed intolerable presumption in 1860 became in 1896 a completed task. In universality of knowledge he rivals Aristotle and Bacon at a time when the sphere of learning is immensely larger than in their epochs. It is not within the province of this survey of literature to go through the twelve large volumes of his works in detail. We would rather point out that, to the unphilosophical reader, who would willingly know something of Spencer's literary powers, the "Study of Sociology," which he wrote for the "International Scientific Series," and the treatise on "Education" are books which all who read must enjoy. To him, with Mill, belongs the glory of restoring to Great Britain the old supremacy in philosophy given to her by Bacon, continued by Locke, Hume, and Berkeley, but temporarily interrupted by Kant and Hegel. Another writer who has attempted to combine psychology with physiology is =Alexander Bain (1818- )=, who was for many years Professor of Logic in the University of Aberdeen, and twice Lord Rector. Bain assisted Mill in the preparation of his "Logic," and has himself written a treatise on that science, also lengthy works on "The Senses and the Intellect," and "The Emotions and the Will." Perhaps his work on "Mental and Moral Science" is his best-known contribution to student literature. Although he is the author of books on grammar and composition, Professor Bain's style is always oppressively heavy and unattractive. As Spencer and Bain combined psychology with physiology, so it was the effort of Boole and De Morgan to extend the scope of logic by an ingenious application of mathematics.