276 TRASSACTIOKS OF ROYAL SCOTTISH ARBORICULTUKAL SOCIETY. 



which is very near what we came to (10,150 cubic feet) by 

 multiplying the volume of the smaller sample tree (50"25 cubic 

 feet) by the assumed number of trees yer acre (202). As, 

 however, I believe there are, on an average, 210 trees per acre, 

 the calculation would probably be more correct thus — 



50-25 X 210 = 10,552 cubic feet, 



which ditfers from the result (10,407 cubic feet) got by using the 

 form figure by less than H per cent. 



These figures show that, in the Douglas fir, we have a tree of 

 extraordinary value, and although it is a little fastidious both as 

 to soil and climate, there are doubtless large tracts where its 

 cultivation will prove in the highest degree remunerative. 



