EXPERIMENT STATION BULLETINS. 727 



ouly about half as great as that at the water content of 1 of soil to .7 

 of water, and vet an apparent equilibrium was attained at this high 

 water content, just as it was in the lower water content. 



When the soils, having a ratio of 1 of soil to 5 of water, were kept 

 at the temperature of .53 -C their rate and extent of solubility were 

 slightly increased. The solubility product, however, was only about 

 one-thii'd as great as that of similar soils kept at the same temperattire 

 but having a ratio of soil to water of 1 to .7 respectively, and yet an 

 apparent equilibrium was attained in the high ratio just as in the small 

 ratio. 



The results of the experiments wherein were used the ration of 1 of 

 water to ."5 of soil go to indicate very strongly that the concentration of 

 the soil solution depends upon the relative masses of the soil and water 

 and that the soil does not pos.sess a definite solubility like definite com- 

 pounds do. 



The amount of material that gr^e^^ into solution seems to increase as 

 the ratio of soil to water is increased up to about the optimum moisture 

 content and then it decreases. 



It is thus seen, that the rate and extent of solubility of soils are 

 affected bv manv soils. 



