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Man's use of wood for structural purposes goes back untold centuries. From the fallen-tree bridge, the rude hut, and the hollow-log canoe, we have traveled a long road to the timber structures of the present day. With this progress has come also a change in conditions. When timber supplies seemed limitless, there was little reason for concern about the species, size, or quality of the timber to be used. Consequently, much timber construction was characterized by over-size members, frequently of very high grade.
Engineer, U. S. Forest Products Laboratory, Madison, Wis.