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 



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I - HEAVV BUNCH GRASS, 

 NO GRAZING 



FOREST SERVICE CUTXING 



LIGHT GRAZING 



BY CATTLE AND SHEEP 



Burned Brush Pl.'es 



Bu.rned Brush Piles 



^ Eage Brush Pil&z, 



Tops 



IL 



Edge Brush Hies 



JL. 



1 



Tops 

 Jk 



3 - FOREST SERVICE CUTTING 

 CLOSELY GRAZED 



8-VIRGlN STAND 

 CLOSELV GRAZED 



Scattered 8ru3h 



Burned Brush Pi'lea 



SKimp Patrhe^ 



Tops 



LO. 



Ki 



Tops 



Jk 



-4-- FOREST SERVICE CUTTING 

 CLOSELY GRAZED 



6 - PRIVATE CUTTING 



OVERGRAZED 

 SPARSE VEGETATION 



Tods on Bare Ground 



Lopped Brush 



8- 



JL 



^ Tops /'n Grass 



FL 



Natural "^^P^ 



LEGEND 

 I ( Total Number Of Two Year Seed Ifngs Pfer Acre 



HBBIH Injured By Grazing^ 

 li^^^S^^sSySj Classed As Large 



Examinations in September and October, I9S0 

 Fig. 15. — Brusli 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. 



