ELEMENTS OF LOGIC: ON THE BASIS OF LECTURES 160 B69 1730 BY WILLIAM BARRON, F. R. S. E. PROFESSOR OF BELLES-LETTRES AND LOGIC IN THE UNIVERSITY OF WITH LARGE SUPPLEMENTARY ADDITIONS, CHIEFLY FROM WATTS, ABERCROMBIE, BROWN, WHATELY, MILLS, AND THOMSON. EDITED AND COMPILED BY REV. JAMES R. BOYD, AUTHOR OF ELEMENTS OF RHETORIC, EDITOR OF KAMES' CRITICISM, AND OF ENGLISH POETS WITH NOTES, ETC. NEW YORK: A. S. BARNES & CO., 51 & 53 JOHN-STREET. KD32710 HARVARD Entered according to Act of Congress, in the year 1856, BY A. S. BARNES & CO., In the Clerk's Office of the District Court of the United States for the Southern District of New York. RICHARD C. VALENTINE, STEREOTYPER AND ELECTROTYPIST, 17 Dutch street, corner of Fulton, NEW YORK. GEORGE W. WOOD, Printer, No 2 Dutch-street INTRODUCTORY OBSERVATIONS. THE Lectures which constitute the basis of the present work were read by the learned author, during twenty-five sessions, in the University of St. Andrews, and may consequently be presumed to have been elaborated with great care, and to be worthy of the attentive study of all who desire to become acquainted with the science and the art of Reasoning. As the Lectures are few and concise, there seemed to be occasion, in fitting them the better for a text-book in schools, or even for private perusal, to supplement them occasionally, from the works of distinguished writers on Logic, on points where, for practical utility, a more full discussion of the subject is needed; and also to introduce various important topics upon which Professor Barron had neglected to offer observations. As stated in the title-page, the works to which the compiler has had recourse for this purpose, are, chiefly, those of Dr. Isaac Watts, Dr. Abercrombie, Archbishop Whately, Dr. Thomas Brown, John Stuart Mills, and William Thomson. The contributions gained from these standard sources will be found at least equal in value, and nearly also in amount, to the Lectures. It is hoped, therefore, that a work has thus been constructed which will be found to possess some advantages over the text-books now most generally used. One peculiar feature of it, is the omission of a great deal of perplexing and useless matter relating to the Syllogism; and yet it presents a full discussion of the value and functions of that ancient form of rea |