SOIL AND MAN 



105 



such as sugar beets, which are capable* of growing m 

 such soils, will sweeten it. 



ROMAN PLOWING. 

 Showing primitive methods. 



48. Soil and Man. Although nature through countless 

 ages has been preparing the soil, and generation after gen- 



STEAM PLOW. 

 Showing modern methods. 



eration of plants and animals has been contributing to its 

 fertility, yet it will not continue profitably to produce 



