In the subsequent editions, the attempt to improve the work by additions and corrections, suggested by criticism or by thought, has been continued. In the present (seventh) edition, a few further corrections have been made, but no material additions. FOOTNOTES: [1] In the later editions of Archbishop Whately's _Logic_, he states his meaning to be, not that "rules" for the ascertainment of truths by inductive investigation cannot be laid down, or that they may not be "of eminent service," but that they "must always be comparatively vague and general, and incapable of being built up into a regular demonstrative theory like that of the Syllogism." (Book IV. ch. iv. § 3.) And he observes, that to devise a system for this purpose, capable of being "brought into a scientific form," would be an achievement which "he must be more sanguine than scientific who expects." (Book IV. ch. ii. § 4.) To effect this, however, being the express object of the portion of the present work which treats of Induction, the words in the text are no overstatement of the difference of opinion between Archbishop Whately and me on the subject. [2] Now forming a chapter in his volume on _The Philosophy of Discovery_. CONTENTS OF THE FIRST VOLUME. INTRODUCTION. § 1. A definition at the commencement of a subject must be provisional 1 2. Is logic the art and science of reasoning? 2 3. Or the art and science of the pursuit of truth? 3 4. Logic is concerned with inferences, not with intuitive truths 5 5. Relation of logic to the other sciences 8 6. Its utility, how shown 10 7. Definition of logic stated and illustrated 11 BOOK I. OF NAMES AND PROPOSITIONS. CHAPTER I. _Of the Necessity of commencing with an Analysis of Language._ § 1. Theory of names, why a necessary part of logic 17 2. First step in the analysis of Propositions 18 3. Names must be studied before Things 21 CHAPTER II. _Of Names._ § 1. Names are names of things, not of our ideas 23 2. Words which are not names, but parts of names 24 3. General and Singular names 26 4. Concrete and Abstract 29 5. Connotative and Non-connotative 31 6. Positive and Negative 42 7. Relative and Absolute 44 8. Univocal and Æquivocal 47 CHAPTER III. _Of the Things denoted by Names._ § 1. Necessity of an enumeration of Nameable Things. The Categories of Aristotle 49