CHAP. IX.] 



Tending of Woods 



191 



On area II to 6-16 inches, or an average diametral increment 

 of 0-48 inches per stem. 



On area III to 6-40 inches, or an average diametral increment 

 of 0-56 inches per stem. 



II. In the other locality, a thirty-six-year-old Spruce wood, 

 raised by sowing, the data were : 



Previous to thinning: 



The operation of thinning removed 



when the arithmetical mean diameter at breast-height of the 

 remaining stems was found to be 



On area I, 3-44 inches ; 



On area II, 4-00 inches ; 



On area III, 4-20 inches ; 



and, just previous to another thinning five years later ; it had 

 risen 



On area I to 388 inches, or an average diametral increment 

 of 0-44 inches. 



