108 BULLETIN 1105, U. S. DEPARTMENT OF AGRICULTURE. 



appreciable change. The seedling counts in 1921 were not made on 

 the same plots as those of 1920, because the 1920 -plots were not 

 marked, and for the additional reason that on most of the 1920 

 plots damage by grazing in 1921 was so evident as to render the 

 plots valueless for the purpose of this study. The fact that the 1921 



^o 



30 



<*Q 



30 



I - HEAVY BUNCH GRASS. FOREST SERVICE CUTTING 

 NO GRAZING LIGHT GRAZING 



BY CATTLE AND SHEEP 



Burned Brush Piles 



Burned Brush Piles 



S Tops 



SI Edge Brush Piles J 



srusn mes r-i 



ru n 



Edge Brush Piles 



I 



Tops 



FOREST SERVICE CUTTING 

 CLOSELY GRAZED 



8-VIRGIN STAND 

 CLOSELY GRAZED 



Scattered Brush 



Burned Brush Piles 



15 rump Pa 

 __l m. 



SrumpPalrhes 



Tops 



*L 



Tops 



20 



forest service cutting 

 closely grazed 



Tops on Bane Ground 

 Natural 



JL 



^ Tops in Grass 



_0 



6 - PRIVATE CUTTING 



OVERGRAZED 

 SPARSE VEGETATION 



Lopped Bru3h 



Hi u i 



-Qa» 



Tops 



LEGEND 

 I | Total Number Of Two Year Seed lings Per Acre 



IHKR1 Injured By Grazing 

 R^^y j Classed As Large 



Fig. 15.- 



Exami nations in September- and October, 1920 

 -Brush disposal and grazing in relation to seedling survival. 



data, which were secured on different plots and in some cases in 

 new localities, show substantially the same thing as the 1920 counts, 

 leaves little room for doubt as to either the representative character 

 or the stability of the indicated relationships. 



Group 9 was not included in the 1920 counts, because the seedlings 

 on these areas were considered too few to yield decisive conclusions. 



