COLORADO VARIETY OF THE DOUGLAS FIR. 



199 



the diameter of the Haystoun Douglas fir plant which was 

 measured was i| inch, while that of the English plant was 

 I inch at the same height ; and Mr Annand states that, in the 

 case of the Haystoun plants, so far as diameter-growth goes 

 the advantage lies with the spruce. 



Haystoun Plants. 



From these measurements it will be seen that in the case of 

 the Haystoun plants growing under precisely similar conditions, 

 the spruce grew more slowly before the eighth year than the 

 Douglas fir, but more rapidly afterwards, and that in the 

 case of the English plant the growth in the seventh and eighth 

 years was better than that of the Haystoun plant. Mr Annand 

 states that there is none of the ordinary green type of Douglas 

 fir at Haystoun of the same age as these glaucous-leaved plants, 

 but that at about half-a-mile distant from this plantation, on the 

 same kind of soil and under similar conditions, plants of the 

 green form about twenty years old have made annual growths 

 varying from 2 feet 6 inches to 3 feet for the past six years. 



