66 THE PRINCIPLES OF SOIL MANAGEMENT 



From this table it appears that, in spite of the finer 

 texture, the humid soils contain 15 per cent less soluble 

 material and, as compared with the semi-arid region, 

 9 per cent less soluble material. 



VII. RESUME OF SCHEME OF CLASSIFICATION AND GEN- 

 ERAL CHARACTERISTICS OF THE GROUPS 



From the foregoing discussion it appears that each 

 group of materials may have properties which are 

 fairly characteristic. Physically, the sedentary materials 

 differ from the transported material chiefly in arrange- 

 ment. In the transported soils those laid down by 

 wind and water are distinctly stratified that is, ar- 

 ranged in layers. This is the result of settling or sedi- 

 mentation from a fluid, and such soils are frequently 

 spoken of as sedimentary. Wind and water are the 

 only two media in which sedimentation occurs in nature, 

 and therefore this arrangement indicates their influence. 

 Thereby the extent and variation of such deposits may 

 be largely interpreted. 



Upon the basis of these formative differences, it is 

 possible not only to identify the different soil materials 

 but to represent their extent upon maps. The broadest 

 separations represented by sedentary and transported 

 soils may be termed divisions. Within these divisions 

 are sub-divisions, according to the agency or material 

 involved. These are termed provinces, that is, meaning 

 the region or province where a certain set of conditions 

 prevailed. For example, in the sedentary division are 

 residual soils from igneous rocks and from limestone 



