Foreword IT occurred to one of Mr. Vail sfriends that a collection of his public utterances would be a convenient book of reference for his library. This book, privately printed, without his revision, consent or even knowledge, is the result; but it is with his approval that copies have been sent to a few of his friends. New York, December i, 1917. (Typographical errors above are due to OCR software and don't occur in the book.)
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