The present book is a tool for the teaching of the liberal arts in high school, or in the freshman year of college for those students whose high school studies were inadequate. It is intended to be at once a handbook and a textbook. As a handbook it should be used by the student throughout his four years in high school in every course. Every teacher in the school should insist that in each subject of the curriculum the processes of definition, statement, and argumentation outlined here should be exactly practiced in the student's reading recitation, discussion, and examination for that subject. In this way the transfer of training can be made explicit and effective. On the other hand this work is also a textbook to assist in the learning of these logical processes. The most appropriate place for its use is in the customary English courses. Here it will not replace the customary material but it will serve as a guide for teacher and student in using material to develop the liberal arts.