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 more urgent. I had just two months to spare, at this period, in the intervals of writing for the Review. In these two months I completed the first draft of about a third, the most difficult third, of the book. What I had before written, I estimate at another third, so that only one-third remained. What I wrote at this time consisted of the remainder of the doctrine of Reasoning (the theory of Trains of Reasoning, and Demonstrative Science), and the greater part of the Book on Induction. When this was done, I had, as it seemed to me, untied all the really hard knots, and the completion of the book had become only a question of time. Having got thus far, I had to leave off in order to write two articles for the next number of the Review. When these were written, I returned to the subject, and now for the first time fell in with Comte’s Cours de Philosophie Positive, or rather with the two volumes of it which were all that had at that time been published.

My theory of Induction was substantially completed before I knew of Comte’s book; and it is perhaps well that I came to it by a different road from his, since the consequence has been that my treatise contains, what his certainly does not, a reduction of the inductive process to strict rules and to a scientific test, such as the syllogism is for ratiocination. Comte is always precise and profound on