In my judgment it cannot be affirmed that the attempts of the latter half of the nineteenth century to develop an experimental science of psychology in independence of philosophical criticism and metaphysical assumption, or the claims of this science to have thrown any wholly new light upon the statement, or upon the solution of philosophical problems, have been largely successful. But certain more definitely psychological questions have been to a commendable degree better analyzed and elucidated; the new experimental methods, where confined within their legitimate sphere, have been amply justified; and certain _quasi_-metaphysical views respecting the nature of the human mind, and even, if you will, the nature of the Spirit in general--have been placed in a more favorable and scientifically engaging attitude toward speculative philosophy. This seems to me to be especially true with respect to two problems in which both empirical psychology and philosophy have a common and profound interest. These are (1) the complex synthesis of mental functions involved in every act of true cognition, together with the bearing which the psychology of cognition has upon epistemological problems; and (2) the yet more complex and profound analysis, from the psychological point of view, of what it is to be a self-conscious and self-determining Will, a true Self, together with the bearing which the psychology of selfhood has upon all the problems of ethics, æsthetics, and religion. The more obvious and easily traceable influences which have operated to incite and direct the philosophical development of the nineteenth century are, of course, dependent upon the teachings and writings of philosophers, and the schools of philosophy which they have founded. To speak of these influences even in outline would be to write a manual of the history of philosophy during that hundred of years, which has been of all others by far the most fruitful in material results, whatever estimate may be put upon the separate or combined values of the individual thinkers and their so-called schools. No fewer than seven or eight relatively independent or partially antagonistic movements, which may be traced back either directly or more indirectly to the critical philosophy, and to the form in which the problems of philosophy were left by Kant, sprung up during the century. In Germany chiefly, there arose the Faith-philosophy, the Romantic School, and Rational Idealism; in France, Eclecticism and Positivism (if, indeed, the latter can be called _a_ philosophy); in Scotland, a naïve and crude form of Realism, which served well for the time as an antagonist of a skeptical idealism, but which itself contributed to an improved form of Idealism; and in the United States, or rather in New England, a peculiar kind of Transcendentalism of the sentimental type. But all these movements of thought, and others lying somewhere midway between, in a pair composed