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SUBMITTED TO THE BOARD OF UNIVERSITY STUDIES OF THE JOHNS HOPKINS UNIVERSITY

IN CONFORMITY WITH THE REQUIREMENTS FOR THE DEGREE OF

DOCTOR OF PHILOSOPHY

1906

BALTIMORE

J. H. FURST COMPANY

1906

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AFTER TEACHING FIFTEEN YEARS, —TO SPEND THREE YEARS IN THE

UNIVERSITY.

WITHOUT THEIR SYMPATHY

THIS WORK COULD NOT HAVE BEEN ACCOMPLISHED.

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