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I shall begin by giving a short account of the views of earlier writers on this subject, and of the status of the dream-problem in contemporary science; since in the course of this treatise I shall not often have occasion to refer to either. In spite of thousands of years of endeavour, little progress has been made in the scientific understanding of dreams. This fact has been so universally acknowledged by previous writers on the subject that it seems hardly necessary to quote individual opinions. The reader will find, in the works listed at the end of this work, many stimulating observations, and plenty of interesting material relating to our subject, but little or nothing that concerns the true nature of the dream, or that solves definitely any of its enigmas. The educated layman, of course, knows even less of the matter. 去书内
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