180 80ILS: PE0FEBT1E8 AND MANAGEMENT 



The relationships already spoken of are especially well 

 shown by the curves (see Fig. 26), particularly the effect 

 of the moisture content on cohesion. In a heavy soil the 

 cohesion increases steadily from a saturated condition until 

 dryness is reached, the increase becoming accelerated as 

 the percentage of moisture decreases. This is because 



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Fig. 27. — The cohesion curves of clay and fine sandy loam at various 

 moisture contents. (C), point at which 3oil changes in qolgr. 



