Bui. 177, Bureau of P'ant Industry, U. S. Dept. of Agriculture. 



Plate II. 



Fig. 1.— Field of Bouteloua rothrockii in a Good Season, 1908. 



Fig. 2.— Field of Bouteloua rothrockii in a Poor Season, 1907. 



COMPARATIVE GROWTH OF GRASS ON RANGE LANDS IN A GOOD AND A 



POOR SEASON. 



