Aug. 20, 191 7 



Relation of Soil Water Movement 



405 



In the first and second experiments we used three cylinders of each soil 

 and in the third two. As in the previously reported experiments (2 , p. 34) , 

 the final moisture conditions as well as the rate of movement were so 

 similar in the duplicates and triplicates that only the averages are 

 reported. As illustrations of the degree of concordance, data from the 

 individual cylinders of three soils are reported in Table IX. 



Table IX. — Data on three soils, illustrating the concordance of the data from triplicate 



cylinders 



DEPTH OF PENETRATION (iN INCHKS) 



Experiment I (initial moist- 

 ure content=o.s hygro- 

 scopic coefficient): 



I hour 



3 hours 



24 hours 



48 hours 



72 hours 



96 hours 



120 hours 



Experiment II (initial moist- 

 ure content=i.o hygro- 

 scopic coefficient): 



I hour 



3 hours 



24 hours 



48 hours 



72 hours 



96 hours 



120 hours 



4.49 

 4.99 

 7.09 



7-52 

 7. 60 

 7-79 

 7-99 



3-94 

 S-78 

 8.97 

 9.84 



10. 48 



11. 02 

 II. 29 



(o) No movement. 



At the end of the period of observ^ation the soil was removed from the 

 cylinders and the moisture determined. In the first and second ex- 

 periments the moistened portion was divided into three equal sections, 

 in each of which the moisture was separately determined. The first 

 inch of dry soil, that immediately below the depth to which the change 

 in color indicated that the water had penetrated, was used as the fourth 

 section. In the third experiment, as the dividing line was in most cases 

 indistinct, the whole soil column was divided into four equal sections, 

 the fourth being that next the bottom of the cylinder. The data show- 

 ing the distribution of moisture when the cylinders were opened are 

 reported in Table X. 



