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FORESTRY QUARTERLY

VOLUME XI

PUBLISHED UNDER THE DIRECTION

OF A

BOARD OF EDITORS

With Four Plates, Four Cuts and Five Diagrams

BELLEFONTE, PENNSYLVANIA
1410 H St., N. W., WASHINGTON, D. C.

WALTER MULFORD, F.E.,

ERNEST A. STERLING, F.E.,

Consulting Forest Engineer,
Philadelphia, Pa.

Harvard University. HUGH P. BAKER, D.Oec.,

Cornell University. RALPHAEL ZON, F.E.,

U. S. Forest Service.

CLYDE LEAVITT, M.S.F.,
Commission of Conservation,

Syracuse University.

Ottawa, Can.

FREDERICK DUNLAP, F.E.,

University of Missouri.

J. H. WHITE, M.A., B.Sc.F.,
University of Toronto

ASA S. WILLIAMS, F.E.

THE OBJECTS FOR WHICH THIS JOURNAL IS PUBLISHED ARE: To aid in the establishment of rational forest maangement. To offer an organ for the publication of technical papers of interest to professional foresters of America.

To keep the profession in touch with the current technical literature, and with the forestry movement in the United States

and Canada.

Manuscripts may be sent to the Editor-in-Chief at the University of Toronto, Toronto, Canada, or to any of the board of editors.

Subscriptions and other business matters should be addressed to Forestry Quarterly, 1410 H. St., N. W., Washington, D. C., P. S. Ridsdale, Business Manager.