FIG. 38. A bit of skyline at Pullman, Washington, showing the rounded, 

 flowing outlines of the dune-like topography. 



FIG. 39. A view in the scab-lands in eastern Adams County. A dis- 

 tance of a few feet may show a change of vegetation from the lichens and 

 mosses on the rocks to the June grass knot-grass or sagebrush com- 

 munities. Likewise, the bunch-grass and balsam-root of the drier soil 

 gives way to more mesophytic species in the depressions. 



FIG. 40. A family of knot-grass invading a newly formed talus slope. 



