Bull. 1091, U. S. Dept. of Agriculture. 



PLATE VIII. 



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Fig. 1. — Content of Den Excavated in New Mexico. 



storage content of Den No. 24, of Table 1, from Sandia Mountains, X. Mex. This is the largest 

 lot of storage taken in the course of the investigations. The larger pile consists wholly of a 

 valuable grass ,Sporobolus cryptandrvs stridus: the smaller of Russian thistle (Salsola pestifer.) 



Fig. 2. — Growth Following Elimination of Kangaroo Rats. 



The same mound as shown in Plate III, Figure 1, after three years of protection, the rodents 

 having been killed out. Nearly as good grass recovery following poisoning operations occurred 

 in the single excellent season of 1921. 



