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Entered according to Act of Congress, in the year 1864, by

SEVER AND FRANCIS,

in the Clerk's Office of the District Court of the District of Massachusetts.

KETIL

UNIVERSITY PRESS:
WELCH, BIGELOW, AND COMPANY,

CAMBRIDGE.

PREFACE.

THE revival of the study of Logic, at least in

1 England and America, as an important element of a University education, dates only from the publication of Dr. Whately's treatise on the subject, little over thirty years ago. Yet so much has been accomplished for the advancement of the science during this short period, that this treatise, with all its excellences, must be admitted to be now as far behind the times as were the compilation by Aldrich, and the meagre compendium by Dr. Watts, the use of which it superseded. Dr. Whately lived long enough to be able to appropriate to himselfthe epigrammatic boast, that he had labored so effectually as to render his own work .useless. Without the interest which was awakened in the study of the science by the publication of his book and the discussions which it excited, it is not too much to say that many of the valuable works upon Logic, which have appeared during the last thirty years, either would not have been written, or would have lacked some of their most interesting and important features. Sir William Hamilton's own labors in this department, by which he certainly accomplished more for the science than has been done by any one man since Aristotle, began with an elabo

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