ASSESSMENT OF THE LOCALITY. 



51 



Volume III. of this Manual, 

 following data may be given 



By ^Yay of illustration the 



Total Production of Timber and Firewood in the course of One 

 Hundred Years, in solid Cubic Feet per Acre. 



The quantities given for the first quality are the highest 

 which can be produced, and they are comparable for the 

 several species ; the same may fairly be said regarding the 

 figures given for the second, or medium, quality. The quan- 

 tities given for the third, or lowest, quality are less com- 

 parable, because the lowest limit suitable for the several 

 species differs considerably. Of our more common forest 

 trees, silver fir produces the greatest quantities, and spruce 

 comes near it. As regards oak it should be noted, that the 

 figures refer to woods grown on alluvial soil only ; there are 

 as yet no data available for oak grown on other lands. 



Taking Scotch pine as an example, it may be said, that, 

 if a localit}^ stocked with it has produced 13,500 cubic feet of 

 woody matter in the course of 100 j^ears, that locality is of 

 the first, or best, quality or yield capacity ; if it has produced 

 8,500 cubic feet, it is of a medium quality ; and if the pro- 

 duction amounts to only 3,500 cubic feet, the quality is of 

 the lowest, on which that species is ordinarily grown. 



The quantities given above include all thinnings taken out 

 of the woods in the course of the 100 years. 



E 2 



