VARIATION IN YR 



39 



b. The influence of site or quality of land, including climate, 

 etc., is very great. Endres, (p. 94) using Lorey, Weise and Baur's 

 tables gives the following figures for the one hundred-year-old stand 

 of timber fully stocked: 



Since this classification itself is really based on arbitrary but 

 generally accepted figures for the volume of timber per acre at a 

 given age it may be said that the above figures are an argument in 

 a circle. But the important fact is that in actual practice the forester 

 deals with lands on which the yield at one hundred years differs as 

 above. The figures clearly show therefore, the great influence of 

 the site on the same kind of timber. That the influence of site is 

 just as great in the United States as in central Europe is certain; 

 the western yellow pine in the Black Hills makes a two or three log 

 tree and yields about five or ten thousand feet per acre, while in 

 parts of California and Oregon it is a six to eight log tree yielding 

 forty thousand feet and over. 



The influence of site on the money value of the final cut, the 

 Yr of the calculation, is even greater than on the volume, since the 

 quality and price are largely matters of size and good land produces 

 larger timber in the same time. Schwappach in his tables of 1902 

 gives the following for spruce, one hundred years old : Volume of 

 site I per acre is 13800 cubic feet, its value $2,085 ; putting the val- 

 ues for site I equal to 100, the relative figures for the different sites 



are : 



Sites I II HI IV 



Volume loo 85 65 S^ 



Value per acre 100 75 54 36 



so that site IV produces half as much timber in volume, but only a 

 little over one-third in value. In pine the average price per 100 



