EFFECT OF GRAZING UPON ASPEN REPRODUCTION. 



13 



Fall Summer Fall Summer Fall Summer Fall 



Id/3 19)4- 1914 1915 1915 19/6 1916 



Total Number Of Sprouts Per Acre 



_ Uninjured Sprouts 



Injured By Barking 



Killed By Barking 



Injured By Frost 



Killed By Frost 



Fig. 3.— Number of sprouts per acre on clear-cut plots and their injury and mortality due to causes other 



than grazing. (Area fenced.) 



