CHAPTER XI. 



AVERAGE YIELDS FROM FOREST LAND. 



THE following yields from particular crops may be expected 

 on certain soils and situations, provided the crops escape 

 damage from insects, fungi, and fire. As regards the values 

 attached to the timber and the thinnings, it must be 

 remembered that these are subject to great variation ; the 

 value of thinnings has in many cases been placed somewhat 

 low since they can usually only be disposed of locally, and 

 any increase in the area under timber would probably be 

 accompanied by a diminution in the amount per acre 

 received for thinnings. The soil and situation are made 

 referable to one of four qualities Quality I. being the best, 

 and Quality IV. the worst. Quality II. represents soil and 

 situation of good average quality. 



The identical soil and situation may be of different 

 quality for different species of trees. 



The number of cubic feet of thinnings is reckoned down 

 to 2 inches quarter girth under bark, so that measurements 

 may be compared with continental data which, for timber 

 only, are reckoned down to 3 inches diameter over bark. 

 The value placed upon the final yields, presupposes that the 

 purchaser fells the timber ; whereas the thinnings are cut out 

 by the home staff of woodmen. 



In all cases it is presumed that 3-year-old trees have 

 been planted : 



