EFFECT OF GRAZING ON WESTERN YELLOW PINE. 7 



DAMAGE BY PERIODS. 



To determine the damage caused during different periods of the 

 grazing season, four examinations were made of all plots during the 

 seasons of 1912 and 1913. The first examination was made at the 

 beginning of the grazing season: the second early in July at che 



Height of Reproduction - Foot C/asses 



FIG. 2. Extent of damage to reproduction of different heights. 



close of the early summer drought ; the third in the fore part of Sep- 

 tember, following the period of maximum plant growth; and the 

 fourth early in November at the end of the grazing season. Results 

 for the two years are summarized for the respective periods in 

 Table III. 



