Water Capacity of Soils. 



133 



in (158) when thoroughly dried and then placed in one 

 inch of water in a chamber where no evaporation could 

 take place, took np and retained by capillarity the follow- 

 ing amounts of water : 



Table showing the maximum capillary capacity for water of 

 field soils ivith the surface 11 inches above standing water. 



3 >. 



Fio. <!. Apparatus for measuring the capillary capacity of long column* 



of sand. 



It is clear from this table and the last that much of the 

 pore space in the clayey soils cannot be maintained full of 

 water by capillarity even when the surface is only 11 inches 

 above standing water. 



