4:22 JOURNAL OF FORESTRY 



These values, which are substantially the same as those obtained by 

 Professor Terry's method (maximum difference is 7 per cent), can, of 

 course, be smoothed out by means of a curve, when they will be almost 

 identical with his. 



The only field measurements needed for preparation of a table of 

 board-foot form factors would be (a) d. b. h. outside bark; (6) length 

 of each section and diameter inside bark at top of each. The only office 

 computation required would be: (a) grouping by d. b. h. classes; (b) 

 computing board-foot scale for each tree from the top diameters and 

 lengths of the separate sections; (c) division of total scale for trees in 

 each diameter class by the sum of the lengths of trees in the respective 

 classes; (d) evening off the resulting quotients, "b," by a curve. 



This does away with computation of cubic foot volume, of F, of R, 

 and of P in Terry's method. 



