Bui. 53, Bureau of Plant Industry, U. S. Dept. of Agriculture 



PLATE XVIII 



FIG. 1. VIEW IN THE SALTON BASIN, NEAR IMPERIAL, CAL., SHOWING LEVEL, BARE 



DESERT SOIL. 



FIG. 2. SHORE OF A DRY SALT LAKE, CHOTT MEROUAN, BETWEEN CHEGGA AND 



M'RAIER, ALGERIA. 



