ADVERTISEMENT TO THE FOURTH EDITION. The Author is gratified that the demand for this work still continues. Logic is a favourite branch of Study in our days. Prejudices respecting it have passed away; its value as an important branch of Education is now admitted; and many master minds are leading the thoughtful, with increasing profit and pleasure, into its loftier and more abstruse developments. Still, for the young at . least, an Elementary Treatise is necesssry. To meet this want in our first-class schools is the object kept constantly in view in this volume. It is at once simple and comprehensive. In addition to the numerous Examples and Exercises in foriner Editions, Diagrams have been introduced which represent the argument to the eye as in Euclid. The advantage of this must be obvious to all. Bath, August 1864. CONTENTS. Different meanings of the term Logic-Consequences of this diversity proper business of Logic simply Reasoning—The elements what respects Logic is a Science, and in what respects it is an Art. History of Logic-Zeno the Eleatic -Sophists--Socrates-Euclid of Megara, Plato-Aristotle—The fate of Aristotle's Manuscripts- Futile controversies of the Middle Ages-Perversion of the Syllo- gism—The revival of Letters—Erasmus and Luther; Ramus, Des Cartes, and Leibnitz; expose the errors of the School-men-Lord Bacon on logical studies—Locke's misapprehensions and mistakes on this subject— Watt's Logic-Mill's “System of Logic, Ratio- cinative and Inductive”—Archbishop Whately's “ Elements of Three operations of the mind in every process of argumentation- Simple Apprehension - Judgment - Reasoning-Logic divided Necessity and use of technical language—Terms may be confused, in- distinct, inadequate-Logical instruments for rectifying, as far as Necessity for distinguishing accurately things that differ—Verbal dis- tinctions—Real distinctions—Univocal, Equivocal, and Analogous terms—Singular and Common terms— Absolute, Relative, and Correlative terms—Opposite and Compatible terms—Abstract and Concrete terms-Connotative and Non-connotative terms-Posi- tire, Negative, and Privative terms-Definite and Indefinite terms Nature and use of Definition-Nominal Definition_Essential Defini- tion-Logical Definition-Accidental Definition-Rules for Defi- |