DOUGLAS FIR PLANTATION : TAYMOUNT ESTATE. 77 



12. Douglas Fir Plantation : Taymount Estate. 



By Frank Scott. 



As particulars of volume, etc., relating to this plantation have 

 from time to time appeared in these TratisacHons (see Vols, 

 xvii. p. 269, xviii. p. 200), the following measurements (see 

 next page) taken in the middle of October last may be of 

 some interest. 



The following was the method adopted in taking the measure- 

 ments. All the trees on the 9-69 acres of plantation were 

 girthed at 5 feet from the ground. They were then classified 

 according to this girth, and the girth of the average stems 

 in each class was found by Weise's 40 per cent. rule. A 

 number of trees of this girth in each class were measured, the 

 timber-height being taken by hypsometer, and the mean girth 

 by actual measurement. The timber- height was taken to 

 1 2 inches in girth over bark. In each class one average tree 

 at least w^as measured in sections of to feet, and by this 

 method, leaving out the average tree in Class 7, which showed 

 an abnormal difference, the average increase was found to be 

 94 per cent. 



Below is added the volume of blown timber removed in 19 12, 

 and a comparison made with the measurements of Dr Schlich 

 taken in 1888. 



Total Volume on 9 '69 acres , 



Average Volume per acre 



Blown timber removed 191 2 per acre 



Volume, 1888 (Dr Schlich's) 



Total Increment per acre, 188S-1912 

 Aver. Annual ,, ,, 1 888- 191 2 



The Aver. Volume per tree is (19 12) 



The Form Factor calculated from the 

 Average trees in each class 



The trees average about 90 feet in height, and are making 

 annual growths of from 9 to 15 inches. 



