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1. LOGIC is divided into two branches, namely- (1) Inductive, (2) Deductive. 2. The problem of inductive logic is to determine the actual truth or falsity of propositions: the problem of deductive logic is to determine their relative truth or falsity, that is to say, given such and such propositions as true, what others will follow from them. 3. Hence in the natural order of treatment inductive logic precedes deductive, since it is induction which supplies us with the general truths, from which we reason down in our deductive inferences. 4. It is not, however, with logic as a whole that we are here concerned, but only with deductive logic, which may be defined as The Science of the Formal Laws of Thought. 5. In order fully to understand this definition we must know exactly what is meant by 'thought, ' by a 'law of thought, ' by the term 'formal, ' and by 'science.' 6. Thought, as here used, is confined to the faculty of comparison. All thought involves comparison, that is to say, a recognition of likeness or unlikeness. 7. The laws of thought are the conditions of correct thinking. The term 'law, ' however, is so ambiguous that it will be well to determine more precisely in what sense it is here used.

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