Of all the direct influences of the forest the influence upon the supply of water in streams and upon the regularity of their flow is the most important in human economy. Yet so many are the factors which play related parts in this influence, so great is the difficulty of observing them with precision, and so wide the range of economic interests affected, that considerable divergence of opinion has arisen on the subject.
Contains bibliography on pages 70-106.
Reprinted with revised Bibliography, 1927 from Appendix V of the final Report of the National Waterways Commission, 1912. (Senate Documet No. 469, 62d Congress, 2d Session)