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Some months ago it was suggested that I should publish my thesis in its unfinished state. I refrained from doing so at that time, as I was unwilling to allow my work to appear until it was ready for publication. When it became apparent that the war. might continue indefinitely. I decided to publish the thesis in such a form as the exigencies of the case would allow.doi:10.1017/s0080456800004452 fatcat:fsohs7yrhvgzzhs3z7cwnzhqd4