Excerpt from The Elements of Logic: Theoretical and Practical

All who have had anything to do with Logic will recognize, without being told it, the extent to which I am indebted to Jevons for both matter and method in the treatment of this subject. But they will quite as readily perceive the deviations from him, and the additions which I have made with the hope of improving upon his work. Jevons designed his "Elementary Lessons" to direct the student in practical reasoning and correct thinking in professional vocations. I have intended the present work to serve the same end, and, if possible, more completely than Jevons. For this reason I have been determined in the development of the subject by the questions constantly put me by students. As far as possible I have endeavored to answer all questions likely to be raised when framing rules about the logical treatment of conceptions and propositions. It will be apparent, therefore, that the plan has necessitated many judicious omissions both of irrelevant matter in Jevons and others, and of certain theoretical discussions peculiar to the scientific rather than the practical aspect of Logic. With a view to the student's guidance and mental discipline I have added a large number of practical questions and exercises at the close of the book.

It is important to remark, however, that I have aimed to satisfy two wants at the same time. I have tried to produce a work that could be used both for beginners and for advanced students of the subject, but not for those who care to go into it exhaustively. Beginners can be directed to the definitions and illustrations, and the heavier matter omitted, while the special questions developed at length and in a more technical manner can be taken up by the advanced student, or by those who are interested sufficiently to press further inquiries.

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