110 THE STUDY OF PLANT COMMUNITIES • Chapter V 



FlG. 53. Soil blowing out of a Kansas wheat field in the 1930's and piling 

 up on highway, where fences and trees partially checked its movement.— 

 U. S. Forest Service. 



FlG. 54. Road cut through a deep deposit of loess in iMissouri. The al- 

 most vertical banks have stood for eighteen years without eroding.— U. S. 

 Forest Service. 



