Fic. 38. A bit of skyline at Pullman, Washington, showing the rounded, 
flowing outlines of the dune-like topography. 
Fic. 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. 
Fic. 40. A family of knot-grass invading a newly formed talus slope. 
