Produced by Marilynda Fraser-Cunliffe, Keith Edkins and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was made using scans of public domain works from the University of Michigan Digital Libraries.) The following essay was written several years ago; but I have hitherto refrained from publishing it, lest, after having done so, I should find that more mature thought had modified the conclusions which the essay sets forth. Judging, however, that it is now more than ever improbable that I shall myself be able to detect any errors in my reasoning, I feel that it is time to present the latter to the contemplation of other minds; and in doing so, I make this explanation…
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