EXERCISES WITH SOILS 123 



clay is carried much farther and gives the streams of water 

 a very muddy appearance. The presence of organic matter 

 in upland soils helps to prevent their washing. 



A study of the streams of any section of the country will 

 indicate • to the student the character of the soils of that 

 section. Muddy streams indicate clay soils with a poor supply 

 of organic matter. Clear streams indicate either a sandy 

 soil or a good supply of organic matter in the upland soil. 

 The difference in streams, however, may he partly due to the 

 amount of soil left loose by tillage. 



