Bui. 67, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate X. 



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Fig. 1.— An Ocotilla Forest About 4 Miles Northeast of the Large Inclosure, 

 September, 1902. Practically no Feed Produced Here. 



Fig. 2.— The Work of Prairie Dogs Upon the Northern Slope of the White 

 Mountains, July, 1903. Large Areas of Grass Lands are Destroyed by 

 this Animal. 



