100 



The Control of the Soil 



[PT. II 



- \>' 



-mi 



Chalk subsoil. This land can be cultivated although the 

 soil is thin. (Harpcndcn.) 



Gravel subsoil. This land cannot be cultivated because the soil is too 

 thin for a gravel subsoil. (No Man's Land. Wheathampstead.) 



Fig. 27. InHiionco of the subsoil. 



