A critical and analytical, rather than speculative, discussion of the theory of knowledge. Since knowledge is inseparable from its expressions, the author begins with an examination of meaning; he then proceeds to discuss the nature of facts, relations, qualities, universals, and individuals, and finally the definition and tests of truth. The question of truth is naturally linked to that of belief, judgment, and negation; and since logical form stands out most clearly in quasi-mathematical deductive systems, a chapter is given to the study of these systems. A list of selected readings bearing on the subjects discussed in each chapter is given.