LAWRENCE, JANUARY, 1915
PUBLISHED BY THE UNIVERSITY
This treatise is printed in substantially the same form in which it was presented to the faculty of Yale University as a doctor’s thesis. The subject was suggested by Professor E. P. Morris, and the study was carried on under his direction. To him, and to Professor Hanns Oertel, who made helpful suggestions, the author is under obligation not only for the method employed but also for the general theory underlying the whole study.
The writer also wishes to thank Professor S. L. Whitcomb, the editor of this series, for valuable help in preparing the work for publication.
E. D. C.
Lawrence, Kansas,
Jan. 1, 1915.