It is a pity that in many instances study of argument is regarded only as a stepping-stone to successful debating, the most rigid of argumentative forms. In reality it is a training, often much needed among college students, in habits of accurate thinking, fair-mindedness, and thorough ness. If this new edition helps to instruction in which argument is regarded from the start by teacher and pupil as above all a means to accurate, thorough, formulated thinking, enjoyable to the thinker, presented in a well phrased and individual style, the chief desire of the authors in their revision will be fulfilled.