186 



THE PRINCIPLES OF SOIL MANAGEMENT 



on vertical movement are very incomplete and inade- 

 quate. King made such a study of sifted quartz sand 

 having a mean diameter of .47 mm., by means of a 

 column with an expanded top, and found that the sand 

 was able to raise water to a height of 6.75 inches at 

 the rate of 44 inches of water per day, equivalent to 

 1,340 feet per year. But this same sand failed to lift 

 any appreciable amount of water to a height of 11.75 

 inches. King has also found the following movement 

 to take place to different heights in columns of soil 

 one square foot in cross section, where the loss was 

 measured by evaporation from the surface. 



As remarked by Professor King, these figures prob- 

 ably do not represent the maximum capacity of these 

 soils to the heights stated. The shorter the column, 

 the less accurate are the figures. For in the short col- 

 umns the evaporation was correspondingly less than 

 the movement. From the results, it appears that the 



