STATE BOARD OF AGRICULTURE. 



FIG. 8. CURVES SHOWING EFFECT OF TEMPERATURE ON THE PERCOLATION OF 



WATER IN SOILS. 



entirely confirmed nor justified. Evidently, there appears to be some 

 other factor or factors which are influenced more predominately by tem- 

 perature than the viscosity of water, and succeed, partially or completely, 

 in overpowering the effects of the latter. These opposing factors are to 

 be found (1) in the swelling of the colloidal material present in the soil, 

 and (2) in change in structure of the soil mass, with increase in tem- 

 perature. 



