Groivth of Red Pine in Ontario. 



167 



Diameter Grozvth. 



The Age-Diameter curves were plotted from 237 measure- 

 ments selected from those obtained from the 141 trees mentioned 

 above, and in the following table the diameter growth figures for 

 open and crowded stands in Minnesota are inserted for sake of 

 comparison. 



Diameter In Inches. 

 Age. Lake Nipissing, Ont. Minnesota. 



(Yrs.) Donit. Codom't. Oppressed. Open Stand- Crowded Stand. 



The much greater diameter growth of the Minnesota trees is 

 partly due to the more open character of the stands and also to 

 the better soil conditions. 



Diameter and Height. 



From the figures given by the Age-Diameter and Age-Height 

 curves for the codominant trees a curve was plotted to show the 

 relationships existing between the diameters and heights of the 

 codominant trees in the stand, which made up fully 85 per cent 

 of it. 



