34 



Increase of girt k of trunk with different planting 



distances ; for a plantation in Province 



Wcllesley, planted January, 1906. 



ist Jan. 1909 . . . j; 14 

 30th Sept. 1909 . i73/ 4 



12 



Total girth per acre. 1934.75 1812.5 1800 2850.75 



In the first line, the planting distance is given, secondly 

 is the number of trees per acre, which accords with the 

 planting distance. , On the line beneath, the average 

 girth of 20 measured trees is inserted. Under that is 

 the figure for the total girth per acre, which is obtained 

 by multiplying the average girth of the trunk by the 

 number of trees per acre. 



It appears from the figures that with a wide planting 

 system the total girth per acre is greater, than with 

 a narrow, with the exception of the last column. If, 

 therefore, the tapping surface is to be taken into consi- 

 deration, a wide planting method is best. Furthermore, 

 the figures show that with a wide planting system the 



