Bui. 741, U. S. Dept. of Agriculture. 



Plate III. 



Fig. 1.— Clear-Cut Aspen Plot No. 1, upon which Normal Sheep Grazing has 



Been Unrestricted. 



In 1914 there were 103,241 specimens of aspen sprouts per acre; in 1916 not a specimen remained. 

 The shrubby vegetation is mountain elder {Sambucus microbotrys). 



Fig. 2.— Clear-Cut Aspen Plot No. 2, upon which, Like Plot 1, the Timber was 

 Removed in the Fall of 1912 and the Area Subsequently Grazed Normally 

 by Sheep. 



The density of the reproduction on this plot was practically the same as on plot 1 the first two 

 seasons after the timber was removed, but in the fall of 1916 not a living specimen was to be 

 found. A luxuriant stand of the palatable mountain brome grass (Bromus marginatus seminudus), 

 has occupied the soil since clear cutting. The luxuriance of the brome-grass cover is evidence of 

 the fact that the aspen reproduction was not destroyed as a result of overgrazing. 



