Plate VII. 



Fig-. 1. Incipient blowout on a hillside in the bunch-grass association, Hanover area. The 

 windward slope is just developing in the background, while an extensive growth of Paniciim Tir- 

 gatitm, indicating the deposits, occupies the center. Rhus is in the foreground, at the right. 



i'"ig. Z. Large blowout in the Hanover area, looking east. The dunes at the right are held 

 by Rims, Tcphrosia, and Paniaim Tirgatinn, by Tephrosia alone at the left, and by Tcphrosia and 

 Panictim at the rear. The basin is aliiiost bare. 



