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writings had begun to excite an interest in the other part of my subject, the theory of Induction. A treatise, however, on a matter so abstract, could not be expected to be popular; it could only be a book for students, and students on such subjects were not only (at least in England) few, but addicted chiefly to the opposite school of metaphysics, the ontological and “innate principles” school. I therefore did not expect that the book would have many readers, or approvers; and looked for little practical effect from it, save that of keeping the tradition unbroken of what I thought a better philosophy. What hopes I had of exciting any immediate attention, were mainly grounded on the polemical propensities of Dr. Whewell; who, I thought, from observation of his conduct in other cases, would probably do something to bring the book into notice, by replying, and that promptly, to the attack on his opinions. He did reply, but not till 1850, just in time for me to answer him in the third edition. How the book came to have, for a work of the kind, so much success, and what sort of persons compose the bulk of those who have bought, I will not venture to say read, it, I have never thoroughly understood. But taken in conjunction with the many proofs which have since been given of a revival of speculation, speculation too of a free kind, in many quarters, and above all (where at one