Abstract
The discussion as to whether forests were the cause of increased rainfall, or whether increased rainfall may possibly be an aid in the production of forests, attracted the attention of the Topographic Service of the United States Government prior to the first trip of the Pony Express. Time has not changed the general subject, but the wording has been modified, and one of the variations of that same subject is the topic of this paper. The United States Geological Survey, since its inception, has been charged with the duty of acquiring and preserving, among other things, data of stream-flow and allied phenomena. The attempt is here made, first, to assemble data from this source in an attempt to trace the variation of the conception of stream-flow and its relation to forest-cover through the records of this branch of the Federal Government, and second, to assemble data from other sources to assist in their evaluation and to present the state of our present knowledge on the subject.
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