236 



ON THE CHEMICAL CONSTITUENTS OF SOILS. 



Corn has been cultivated for seventy years upon 

 this soil, which has never received dung or any other 

 kind of manure; it is, however, occasionally fallowed. 

 The subsoil retains the same composition as the 

 surface-soil for a depth of 6-12 feet, so that it may 

 be considered inexhaustible. When one portion of 

 the soil is rendered unfit for use, the inferior layers 

 are brought up to the surface. 



29. Analysis of a soil from Rahdingen, near Balje. 

 In this case the sea has assisted in the formation of 

 the soil. The field yielded beautiful corn after being 

 manured with stable dung, being particularly re- 

 marked for its fine crops of wheat, beans, and winter 

 barley. 100 parts contain: — 



100-000 



30. Soil of a field remarkable for producing large 

 crops of hemp and horse-radish. 100 parts con- 

 sisted of: — 



100-000 



