Bul, 211, U. S. Dept. of Agriculture. PLATE IX. 
FiG. 1.—VIEW IN THE SOUTH-CENTRAL PART OF NEW MExiIco, SHOWING A SMALL 
TANK IN THE FOOTHILLS. 
Fic. 2.—VIEW IN THE SOUTHEASTERN PART OF NEW MExXIco, SHOWING A LARGE 
TANK ON THE PLAINS. 
