92 



the 1214 to 1820 inches. Moreover, as time progressed and 

 the distilled water followed the solution, forcing it upward 

 through the soil, the sulphates were carried forward until, in 

 the surface inch, they had increased almost as much above the 

 normal as, at the bottom, they had fallen below it. Observa- 



'00 



SO 



/-I 2*3 



\ 



H-t /:*- 



\ 



LA 



\ 



FIG. 5. Showing distribution of water-soluble sulphates after capillary move- 

 ment. Solid line indicates results after 50 days ; broken line, results after 

 20 days. Values are means for 8 soil types. 



tions.like these emphasize with much force that the soluble salt 

 content of soils is liable to suffer profound changes with the 

 change in the character of the soil moisture and with its amount 

 which must result from heavy rains and very drying weather, 

 especially if at all protected, as is not infrequently the case. 



