272 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



On area No. 1 there were 18 trees, and on area No. 2, 25 trees, 

 the mean for the vv^hole wood being probably not les.s than 

 210 per acre. In order to facilitate accurate comparison with 

 Dr Schlich's figures of 1888, we may assume the same average 

 number of trees per acre, namely, 202. In the case of area No. 2, 

 four of the trees were exceptionally small, and in a wood planted 

 sufficiently close in youth they would certainly have disappeared 

 in the thinnings. The total sectional area of the stems at 4^ feet 

 was 290 and 300 feet respectively per acre, mean say 295. From 

 these figures the mean diameter of the trees of area No. 1 

 works out at 17-2 inches (girth, 4 feet 6 inches), while in the 

 case of area No. 2 it is 14-8 inches (girth, 3 feet 10^ inches). 



