. 70 80 <)0 100 rto /ZO 130 



Aqe 

 8000 c.r 



7ooo 



/SO /60 /7O /8O 



Ji 



6000 



Sooo 



Sooo 



2.000 



/OOO c. 



/OOO 



70 (SO <?0 tOQ //Q /a.O /JO /4-0 /fa '60 



/BO 



Fig. 6. "White Oak; N. Germany; Sites I-III; Normal Yield of Main Stand in cubic feet 

 )er acre. Also points indicating at what age the average tree attains a diameter of 12", 16", 

 24", and a height of 60 ft., 70 ft., etc. Only wood 3" and over is here considered. 



155 



