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In the same year, 1837, and in the midst of these occupations, I resumed the Logic. I had not touched my pen on the subject for five years, having been stopped and brought to a halt on the threshold of Induction. I had gradually discovered that what was mainly wanting, to overcome the difficulties of that branch of the subject, was a comprehensive, and, at the same time, accurate view of the whole circle of physical science, which I feared it would take me a long course of study to acquire; since I knew not of any book, or other guide, that would spread out before me the generalities and processes of the sciences, and I apprehended that I should have no choice but to extract them for myself, as I best could, from the details. Happily for me, Dr. Whewell, early in this year, published his History of the Inductive Sciences. I read it with eagerness, and found in it a considerable approximation to what I wanted. Much, if not most, of the philosophy of the work appeared open to objection; but the materials were there, for my own thoughts to work upon: and the author had given to those materials that first degree of elaboration, which so greatly facilitates and abridges the subsequent labour. I had now obtained what I had been waiting for. Under the impulse given me by the thoughts excited by Dr. Whewell, I read again Sir J. Herschel's Discourse on the Study of Natural Philosophy: and I was able to measure the progress my mind had made, by the great help I now found in this work—though I had read and even reviewed it several years before with little profit. I now set myself vigorously to work out the subject in thought and in writing. The time I bestowed on this had to be stolen from occupations 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 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 the method of investigation, but he does not even attempt any exact definition of the conditions of proof: and his writings show that he never attained a just conception of them. This, however, was specifically the problem, which, in treating of Induction, I had proposed to myself. Nevertheless, I gained much from Comte, with which to enrich my chapters in the subsequent rewriting: and his book was of essential service to me in some of the parts which still remained to be thought out. As his subsequent volumes successively made their appearance, I read them with avidity, but, when he reached the subject of Social Science, with varying feelings. The fourth volume disappointed me: it contained those of his opinions on social subjects with which I most disagree. But the fifth, containing the connected view of history, rekindled all my enthusiasm; which the sixth (or concluding) volume did not materially abate. In a merely logical point of view, the only leading conception for which I am indebted to him is that of the Inverse Deductive Method, as the one chiefly applicable to the complicated subjects of History and Statistics: a process differing from the more common form of the deductive method in this—that instead of arriving at its conclusions by general reasoning, and verifying them by specific experience (as is the natural order in the deductive branches of physical science), it obtains its generalizations by a collation of specific experience, and verifies them by ascertaining whether they are such as would follow from known general principles. This was an idea entirely new to me when I found it in Comte: and but for him I might not soon (if ever) have arrived at it.

I had been long an ardent admirer of Comte's writings before I had any communication with himself; nor did I ever, to the last, see him in the body. But for some years we were frequent correspondents, until our correspondence became controversial, and our zeal cooled. I was the first to slacken correspondence; he was the first to drop it. I found, and he probably found likewise, that I could do no good to his mind, and that all the good he could do to mine, he did by his books. This would never have led to discontinuance of intercourse, if the differences between us had been on matters of simple doctrine. But they were chiefly on those points of opinion which blended in both of us with our strongest feelings, and determined the entire direction of our aspirations. I had fully agreed with him when he maintained that the mass of mankind, including even their rulers in all the practical departments of life, must, from the necessity of the case, accept most of their opinions on political and social matters, as they do on physical, from the authority of those who have bestowed more study on those subjects than they generally have it in their power to do. This lesson had been strongly impressed on me by the early work of Comte, to which I have adverted. And there was nothing in his great Treatise which I admired more than his remarkable exposition of the benefits which the nations of modern Europe have historically derived from the separation, during the Middle Ages, of temporal and spiritual power, and the distinct organization of the latter. I agreed with him that the moral and intellectual ascendancy, once exercised by priests, must in time pass into the hands of philosophers, and will naturally do so when they become sufficiently unanimous, and in other respects worthy to possess it. But when he exaggerated this line of thought into a practical system, in which philosophers were to be organized into a kind of corporate hierarchy, invested with almost the same spiritual supremacy (though without any secular power) once possessed by the Catholic Church; when I found him relying on this spiritual authority as the only security for good government, the sole bulwark against practical oppression, and expecting that by it a system of despotism in the state and despotism in the family would be rendered innocuous and beneficial; it is not surprising, that while as logicians we were nearly at one, as sociologists we could travel together no further. M. Comte lived to carry out these doctrines to their extremest consequences, by planning, in his last work, the Systhme de Politique Positive, the completest system of spiritual and temporal despotism which ever yet emanated from a human brain, unless possibly that of Ignatius Loyola: a system by which the yoke of general opinion, wielded by an organized body of spiritual teachers and rulers, would be made supreme over every action, and as far as is in human possibility, every thought, of every member of the community, as well in the things which regard only himself, as in those which concern the interests of others. It is but just to say that this work is a considerable improvement, in many points of feeling, over Comte's previous writings on the same subjects: but as an accession to social philosophy, the only value it seems to me to possess, consists in putting an end to the notion that no effectual moral authority can be maintained over society without the aid of religious belief; for Comte's work recognises no religion except that of Humanity, yet it leaves an irresistible conviction that any moral beliefs concurred in by the community generally may be brought to bear upon the whole conduct and lives of its individual members, with an energy and potency truly alarming to think of. The book stands a monumental warning to thinkers on society and politics, of what happens when once men lose sight, in their speculations, of the value of Liberty and of Individuality.