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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 occu-