Bui. 1170, U. S. Dept. of Agriculture. 



Plate IV. 



Fig. I.- Unit in the 30-AcreIPasture Closed to Grazing in 1918. 



Note the plants of Artemisia frigida, which arc about normal in size and number. The top of 

 the frame in each case marks the divisi< n between the closed units and those ne\ er grazed. 

 October, 1921. 



Fig. 2. — Unit in the 30-Acre Pasture Closed to Grazing in 1919. 



Note the plants of A rttmisia frigida, which are about normal in size but somewhal thicker on the 

 ground than those shown in Figure 1. October, 1921. 



