sonal and private experiences. As a consequence, mind, the source and possessor of knowledge, was thought of as wholly individual. Thus upon the educational side, we find educational reformers, like Montaigne, Bacon, Locke, henceforth vehemently denouncing all learning which is acquired on hearsay, and asserting that even if beliefs happen to be true, they do not constitute knowledge unless they have grown up in and been tested by personal experience. The reaction against authority in all spheres of life, and the intensity of the struggle, against great odds, for freedom of action and inquiry, led to such an emphasis upon personal observations and ideas as in effect to isolate mind, and set it apart from the world to be known.
This isolation is reflected in the great development of that branch of philosophy known as epistemology—the theory of knowledge. The identification of mind with the self, and the setting up of the self as something independent and self-sufficient, created such a gulf between the knowing mind and the world that it became a question how knowledge was possible at all. Given a subject—the knower—and an object—the thing to be known—wholly separate from one another, it is necessary to frame a theory to explain how they get into connection with each other so that valid knowledge may result. This problem, with the allied one of the possibility of the world acting upon the mind and the mind acting upon the world, became almost the exclusive preoccupation of philosophic thought. The theories that we cannot know the world as it really is but only the impressions made upon the mind, or that there is no world beyond the individual mind, or that knowledge is only a certain association of the mind's own states, were products of this preoccupation. We are not directly concerned with their truth; but the fact that such desperate solutions were widely accepted is evidence of the extent to which mind had been set over the world of realities. The increasing use of the term 'consciousness' as an equivalent for mind, in the supposition that there is an inner world of
