SOIL EROSION 



367 



I 



Fio. 179. A torraccd park in Mississippi. While the natural slope wns stable under the 

 protection of the virgin forest, it was necessary to terrace to prevent devastating erosion 

 when the land was cleared. (Bureau of Soils, I". S. D. A., Hul. 71.) 



FIG. ISO. --The ManRum terrace. With this form there is no wasteland. (I'.S. Dopt. of Agr.) 



