The papers appearing in this collection are, with one exception reprinted from journals. I have not included any contributions I made to books published in this country and I have also omitted some recent unpublished papers which will appear in a boot now in preparation.
In presenting these papers I have deliberately refrained from adding comments to show the changes and expansions which my views have undergone in the course of time, for I think that the development of my work can be adequately traced if the papers are read consecutively.
I wish to acknowledge the work of my friend Lola Brook in preparing the index, and take this opportunity to express my gratitude for the very valuable help she has given me in my work over the last few years.
LONDON, January 1947 . . .
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