The author may be allowed to add, that Mr. Mill, before publication, expressed a favourable opinion of the manner in which the work had been executed. Without such commendation the volume would hardly have been offered to the public. LONDON: _Dec. 21, 1865_. CONTENTS. PAGE INTRODUCTION 1 BOOK I. NAMES AND PROPOSITIONS. CHAP. I. On the Necessity of commencing with an Analysis of Language in Logic 3 II. Names 3 III. The Things denoted by Names 7 IV. Propositions 17 V. The Import of Propositions 19 VI. Propositions merely Verbal 24 VII. The Nature of Classification, and the Five Predicables 26 VIII. Definition 30 BOOK II. REASONING. I. Inference, or Reasoning in General 35 II. Ratiocination, or Syllogism 36 III. The Functions and Logical Value of the Syllogism 39 IV. Trains of Reasoning, and Deductive Sciences 43 V. & VI. Demonstration and Necessary Truths 46 BOOK III. INDUCTION. I. Preliminary Observations on Induction in general 53 II. Inductions improperly so called 54 III. The ground of Induction 57 IV. Laws of Nature 58 V. The Law of Universal Causation 60 VI. The Composition of Causes 66 VII. Observation and Experiment 67 VIII. & Note to IX. The Four Methods of Experimental Enquiry 69 X. Plurality of Causes, and intermixture of Effects 73 XI. The Deductive Method 76 XII. & XIII. The Explanation and Examples of the Explanation of Laws of Nature 77 XIV. The Limits to the Explanation of Laws of Nature; and Hypotheses 79 XV. Progressive Effects, and continued Action of Causes 81 XVI. Empirical Laws 83 XVII. Chance, and its Elimination 85 XVIII. The Calculation of Chances 87 XIX. The Extension of Derivative Laws to Adjacent Cases 89