In general, this last map, as compared with the earlier ones, although showing a steady shrinkage of the Nordic area, brings out clearly the manner in which it centres around the basins of the Baltic and the North Sea, radiating thence in every direction and in decreasing numbers. The menace of the continued expansion of the green area westward and northward into the red area of the Nordics is undoubtedly one of the causes of the present world war. This expansion began as far back as the fall of Rome, but only in our day and generation has this backward race even claimed a parity of strength and culture with the Master Race.
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The purpose of these notes is to meet an insistent demand for authorities for the statements made in the body of the book. As was mentioned in the Introduction, in a work of this compass and aim, mere lack of space forbade all but the barest outlines, so that often an appearance of dogmatism was the result.
There is a vast literature on the subjects discussed and to give all the references would be almost a physical impossibility. It is particularly difficult to name all that has appeared in periodicals, since they have become so numerous, especially during the last few years.
The author has in mind to refer only to those works which bear directly on the most essential statements made and, necessarily, to but a part of these. In many cases only books which are most easily available have been used. The author has intentionally quoted chiefly works in English, where these exist, and when using foreign authorities has translated the statements.
It must be clearly understood that the references are given for the facts rather than the theories they contain. In no case, unless specifically stated, is the author committed to the conclusions drawn in the works cited. In order to present all sides, authorities who differ in viewpoint are sometimes listed, the reader being left to make his own decision of the case.
It is hoped that the references will be of assistance to students of anthropology and to those who care to inquire further into the subjects under discussion.
Where an author is quoted frequently or for more than one book, he is referred to merely by name; the book is given by number immediately following. Its full title may be ascertained in the bibliography.
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