59 



particulars about the height which the Douglas 

 fir attains, viz. : 



Average height in Extreme height in 



Age (years) metres. metres. 



5 0-5 ro 



10 3'5 7' 



15 8-5 12-0 



20 13-5 15-0 



25 i6'o i8'o 



It is very unfortunate that for the purpose of 

 verifying all statements about soil, climate, and 

 locality we have no statistics to go upon. Dr. 

 Nisbet l speaks of an area in Scotland widely 

 planted on good soil (at intervals of 6 ft.), which, 

 in the course of forty years reached an average 

 height of 23 metres and an average diameter of, 

 at a man's height, 70 centimetres. This would 

 come to 340 f.m. per hectare which is not more 

 than what our native spruce and fir could produce 

 on the most fertile soil. We have no statistics as 

 to results from Germany. The particulars which 

 Schwappach gives us as to the increased growth 

 in certain districts gives us no idea of the general 

 output. All the same it would appear as if the 

 Douglas fir, grown in the most favourable 

 localities in Europe, would do just as well as in 

 its own home. In its home Mayr (see I.e.] gave 

 4,100 f.m. as the solid output of timber for 



1 "Our Forests and Woodlands," 1900, p. 208. 



