210 E. W. Filgard—Flocculation of Particles. 
and (in silt soils) of drying. ‘Tillage acts not merely, as Pro- 
fessor Johnson says (On some Reasons for Tillage, Rep. Sec’y, 
Conn. Board of Agr., 1877-8): “by lifting up masses of soil, 
turning them and letting them fall so that the close contact 
er distances ” 
the tillage may be done within a wide range of condition as 
moisture, are those containing a great variety of sediments © 
