A MILL SCALE STUDY OF WESTERN YELLOW PINE. 



6OO 



500 



400 



300 



200 



100 



JO 



LOW 10% 



30 40 50 60 70 8O 

 PERCENT OF TOTAL NUMBER OF TREES 



snfV outw ard appearances. The bottom curve marked 

 * Up n rnl 7 trees ' which were identified as "bull pine" (or "black- 

 ? tending. This curve was constructed as follows: (a) Data sheets 

 6r f ag fr m the y un sest to the oldest tree. (&) Sheets were 

 g J OUDS 1 ' e{ i ch representing five per cent of the total number of trees. 

 f 6ach Of i t . hese groups were then Pitted in their respective order, 

 trees were plotted for the lowest five per cent and also for the highest 

 nin vpnnw J he *?V curve marked "mature" is based upon 412 trees identified as 

 typical yellow pine, and was constructed the same as the curve marked "immature " 



