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of the University Press of Cambridge, Mass. My sincerest thanks are due to him and to several of my colleagues who have rendered me valuable assistance, especially to Dr. Max Diez and Dr. J. Lassen Boysen for their painstaking cooperation in revising the manuscript and proofs, and to Professor Francis A. Wood for a number of important suggestions, but most of all to Professor K. F. Muenzinger, with whom I have discussed many crucial questions during various phases of my work.

AUSTIN, TEXAS, November, 1916.)


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