228 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



From the above data it follows that the average sectional area 



158-17 

 per tree is = 



•783 square feet, which corresponds to a 



202 

 diameter of 12 inches. 



The sample tree of average development, which was felled, 

 showed the following dimensions : 



Diameter at 4 feet 6 inches above the ground, . 11-78 inches. 



Sectional area ,, ,,,,.. -757 sq. ft. 



Height, ...... 60 feet. 



At 48 feet from the ground the stem showed a diameter of 3 

 inches, and here the top was cut off. These 48 feet were divided 

 into eight sections of 6 feet length each, each section measured in 

 the middle, and thus the following data obtained : 



The top, 12 feet in length, and the branches, were stacked, and 

 found to fill a space of 50 cubic feet, which may perhaps be put 

 as equal to 50' x •15 = 7-5 cubic feet of woody matter. In the 

 present paper this wood will not be taken into account. 



From the contents of the sample tree, the volume of solid wood 

 per acre was calculated according to the following equation : — 



