144 FOREST VALUATION 



Since these German tables can not be used in the United States 

 without modification, it seemed unnecessary to tabulate for all five 

 sites, and only the figures for site II as nearly a good average, are 

 here reproduced. Most of the figures are rounded off. The graphs, 

 figures 3-8, follow Schwappach's as given in his admirable "Ertrag- 

 stafeln d. wichtigeren Holzarten," 1912. 



How far these tables may serve to guide and chedc in our work 

 in the United States is yet to be learned. It seems reasonable, how- 

 ever, that for trees of similar habits, tolerance and soil requirements, 

 etc., the yield per acre is well indicated by height growth, and that 

 as a provisional check we may assume that if spruce in a certain 

 district in the United States has a height growth equal to that of 

 spruce site III in Germany, the yield per acre will also approximate 

 that of site III, etc. 



MONEY YIELD TABLE FOR SPRUCE, SITE IL 



Middle and N. German}'; Schwappach; 1902. 



Only wood 3" and over (Derbholz) considered. 



