CAPILLARY MOVEMENT AND TEXTURE 



177 



Lotighridge has made very careful determinations 

 of the capillary power of four dry soils of known physical 

 composition over a period ranging from 6 to 195 days. 

 These soils range in texture from light sandy loam to 

 heavy clay adobe of the following mechanical com- 

 position. 



Table XXX 



1. Sand soil 



2. Light sandy loam 



3. Silty loam 



4. Clay soil 



Per cent of each separate present 



Clay 

 less than 



Fine silt 



Coarse 

 silt 



Sand 



Limits used in diameter of particles 



.01 



mm. 



2.82 



3.21 



15.02 



44.27 



.01-025 

 mm. 



3.03 



5.53 



15.24 



25.35 



.025- .047 



mm. 



3.49 

 15.42 

 25.84 

 13.47 



.04 7- .5 

 mm. 



89.25 

 72.05 

 45.41 

 13.37 



The composition of these soils is also shown in the 

 following curves: 



SANDS 

 L047. - .5 MM.) 



COARSE SILT 

 (.025 -.047 MM.) 



FINE SILT 

 (.01 - .025 MM.) 



Fig. 55. Curves showing the mechanical composition of the soils whose 

 analysis is given in Table XXX, and whose capillary water capacity is given in 

 Table XXXI and Figs. 56 and 57. 



