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THIS book was written in the early part of 1883, and now that I am venturing to recommend it to public notice afresh in the latter part of 1884, after three English editions have passed through the press, I find myself in possession of much additional information bearing on many of the problems dealt with. But I am glad to be able to say that such later teaching as I have yet received only reveals incompleteness in my original conceptions of the esoteric doctrine, — no material error so far. Indeed, I am happy enough to have received, from the great adept himself from whom I obtained my instruction in the first instance, the assurance that the book as it now stands is a sound and trustworthy statement of the scheme of Nature as understood by the initiates of occult science, which may have to be a good deal developed in future, if the interest it excites is keen enough to constitute an efficient demand