Synopsis There are to things that this book is not. First, it is not an historical introduction to philosophy. I have dealt only in a few cases with the history of the problems under consideration, but have generally given only brief notes and a few references to guide the student should he desire to devote some time to looking up historical matters. Secondly, it is not a handbook of philosophy. It does not give pro and con all the various doctrines held by the great philosophical writers of the past and the leading writers of the present. It does not give an exhausitive bibliography under the different headings, but mentions as a rule only those books with whose titles the beginner should get acquainted and in which he will find the best introduction to a further and profounder treatment of the problem in hand. The book presupposes on the part of the reader a general knowledge of natural science, psychology, and formal logic.