Bui. 25, Div. of Agrostology, U. S. Dept. of Agriculture. 



Plate XVIII. 



Fig. 1.— Sheep grazing in the Mountains above Wallowa Lake, Oregon. 



From a |ih(itograi)h by C. L. Shear. 



Fig. 2.— In the Field. Messrs. Griffiths and Williams in Northern Wyoming. 



