NOTES AND REFERENCES

In these references, especially in regard to works published early in the century, I have given both the original publication details and, where appropriate, more recent editions and reprints. This is to aid readers who wish to pursue particular works, to show them where the more accessible versions are to be found. In addition, however, the publication history of key works also shows how the popularity of certain key ideas has varied down the years.

Quite naturally, there are fewer references for the last quarter of the book. These works have had much less chance to generate a secondary literature of commentary and criticism.

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