VI 



YIELD TABLES 



Note has already been made of the fact that 

 White Pine was very seldom found perfectly 

 pure, and that when such groups occurred they 

 were always very small in area. The groups 

 for the valuation surveys were selected with as 

 little admixture of other species as possible. 

 Whenever it was feasible a full acre was mea- 

 sured ; but in several instances where the Pine 

 occurred in small patches the survey covered 

 only three quarters of an acre. 



The procedure was as follows : After staking 

 off the area, the diameters of the trees were 

 measured with calipers to the nearest inch. All 

 diameter measurements were taken at 4J feet 

 above the level of the ground. The different 

 species were entered in separate columns in the 

 field-book. After a tree was measured, the 

 bark was blazed with a gouge-blaze, in order 

 that no mistake might occur by measuring it 

 again. 



The inch diameter classes were then arranged 



58 



