In summary, bark thickness for sugar maple trees in Vermont is strongly 

 correlated with tree d.b.h. — and the relationship is positive. As the diam- 

 eter increases, the average bark thickness increases. When radial inside 

 bark parameters are desired, single bark thickness should be used. But 

 when diameter inside bark measurements are desired, the bark thickness 

 must be doubled. 



Those desiring exact inside bark parameters should measure and com- 

 pute the bark thickness, d.b.h. relationship, for the locale involved. 



— H. CLAY SMITH, Research Forester 



Northeastern Forest Experiment Station 

 Forest Service, U.S. Dept. Agriculture 

 Burlington, Vermont 



Literature Cited 



1. Johnson F. A. 3. Ostlin, E. 



Establishing Past Diameters of Bark Data for Pine, Spruce, Birch, 



Douglas Fir Trees. U. S. Forest Serv., etc. Part 2. Bark data for Site and 



PNW. Forest and Range Exp. Sta. Res. Age Classes and for Sawlogs and 



Note No. 112, 3 pp. 1955. Pulpwood. Rapp. Uppsats. Instn. Stogs- 



2. Korsun, F. tax., Skogskogsk., Stockh. No. 6: 67, 

 Bark Thickness as a Function of 1963. (Rev. Forestiy Abstract 1018: Vol. 

 Stem Diameter. Les, Bratislava 2: 51- 26, 1965.) 



54, 1955. (Rev. Forestry Abstract 4373, 

 Vol. 16, 1955.) 



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