rom the Introductory. Thought is so wonderful and incomparable a thing that it is all the more deplorable that so many men use it indifferently. They will plan the building of a house, or a summer trip, to the smallest detail, but will permit their minds to remain in an almost continuous state of disorder. How many men ever stop seriously to analyze the workings of their minds, or carefully to consider by what means they reach certain conclusions? Thinking, like breathing, comes so naturally to them that they do not see any necessity for study. To others thought is so complex and evanescent that any attempt at classification of ideas seems an altogether hopeless undertaking. When, however, we find men so often entangled in mental absurdities, we are led to believe that some such study is essential to clear and accurate thinking. Disputation is carried on by most men as a spontaneous act. There are no rules by which the speaker is governed. But it should be remembered that "It is by a long, careful, patient analysis of the reasoning by which others have attained results, that we learn to think more correctly ourselves." The mind conceives, compares, abstracts, defines, judges, and seeks to express its conclusions to other minds. Its power grows through practise, and gradually it comes to realize the truth of Pascal's exclamation: "With space the universe encloses me and engulfs me like an atom, but with thought I enclose the universe!"