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The publisher has asked me to write a note of introduction to this book. Surely it needs none; but it is a pleasant task to write prefaces for Other people’s books. When one writes a preface to a book of one’s own, one naturally grovels, deprecates, and has no opportunity to call the friendly reader’s attention to what the author considers the beauties and significances of the work. How agreeable, then, to be able to do this service for another. Moreover, one hopes that such a service may not be wholly vain. Every book has its own special audience, for whom—very likely unconsciously—it was written: the group of people, far spread over the curve of earth, who will find in that particular book just the sort of magic and wisdom that they seek. And, as every one who has studied business knows, books very often tragically miss just the public that was waiting for them. It is such an obscure and nebulous problem, getting into the hands of the people to whom it will appeal. One knows that there are thousands of readers for whom that book (whatever it may be) will mean keen pleasure. But how is one to find them and bring the volume to their eyes