Excerpt from The Pulse of Progress: Including a Sketch of Jewish History
Three primary considerations have led to the writing of this book. The first is the modern movement for setting forth the re sults of scientific research, not only in technical publications, but in clear, interesting, and non-technical form without the eucum brance of references, footnotes, and details of proof. The second is the frequently expressed opinion of a number of friends that the ideas as to man and his environment which I have set forth in a dozen books ought to be summarized in a single volume. In the third place, some one ought soon to write a history of human progress which will take full account of recent advances in our knowledge of human geography, ethnography, economics, soci ology, and biology. As a preparation for this, it seems highly de sirable that persons who have original ideas along these lines should set them forth in such a way that they can be subjected to criticism.
At first the plan was to limit the book strictly to the three purposes named above. As usually happens, however, the prog ress of the work soon led to the addition of new material in order to round out the subject. Chapters II, III, and IV present the results of new investigations made especially for this book. Other new material is scattered in smaller bits elsewhere. Chap ters V to X are mainly a restatement, rearrangement, and revision of material published during the last twenty years in the books and articles mentioned in the list preceding the index. It has not seemed necessary or advisable to use quotation-marks, al though sections oi as much as two or three pages have, in some cases, been taken, almost unchanged, from some of the books.
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