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DEDUCTIVE LOGIC

FOWLER

HENRY FROWDE, M.A.

PUBLISHER TO THE UNIVERSITY OF OXFORD

LONDON, EDINBURGH

NEW YORK

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President of Corpus Christi College
And formerly Professor of Logic in the University of Oxford

Honorary Doctor of Laws in the University of Edinburgh

TENTH EDITION, CORRECTED AND REVISED

OXFORD

AT THE CLARENDON PRESS

MDCCCCV

HARVARD
UNIVERSITY
LIBRARY
047859

OXFORD

PRINTED AT THE CLARENDON PRESS

BY HORACE HART, M.A.
PRINTER TO THE UNIVERSITY

PREFACE

THE precise object of the following pages is (without pre-supposing any technical acquaintance with logical terminology) to enable a student of average intelligence to acquire for himself an elementary knowledge of the main problems, principles, and rules of Deductive Logic. They are not designed to save him the trouble of afterwards consulting more advanced text-books, either in his own or other languages. The English student who wishes to gain an exact and detailed knowledge of the relations of Deduction to Induction, and consequently of the true place and value of the former process in any special science, must still have recourse to the works of Mr. Mill; or, if he wish to trace the history of logical terms and doctrines (one of the most important chapters in the history of both ancient and modern literature), he must still consult Sir W. Hamilton's Lectures, and the Appendices and Notes of Dr. Mansel to Aldrich's Logic,

To these works, as well as to Archbishop Whately's luminous Chapter on Fallacies, and to the original and suggestive work of Mr. James Mill on the Analysis of the Phenomena of the Human Mind, the Author must, once for all, express his obligations. He has, however, endeavoured, on all disputed points, to reason out his

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