CAPILLARY MOVEMENT OE SOIL MOISTURE. 



45 



• An examination of these data shows that the flumes inclined up- 

 ward from the horizontal use a relatively large quantity of water 

 during the first two or three days and that after that time a relatively 

 small quantity of water. Near the end of the 30-day period very 

 little water is taken up by these flumes. With the flumes inclined 

 downward from the horizontal a somewhat larger quantity of water is 

 used during the first three or four days than thereafter. However, 

 these flumes after about the fourth or fifth day use a rather constant 

 uniform quantity of water for an indefinite period of time within the 

 limits of these tests. Table 33 gives the total quantity of water in 

 liters used by the several flumes for different periods of time and 

 shows in a more condensed form the data presented in figure 6, and 

 that on the thirtieth day a vertical flume had used but 15 liters of 



Tattle 33. — Total quantity of water used at various times, in liters. 









Flume. 







Number 

 of days. 





























34 



32 



31 



39 



42 



•43 



1 



10.0 



9.5 



10.0 



7. 5 



10.0 



7.0 



3 



20.0 



18.0 



16.0 



13.0 



14.0 



10.5 



5 



29.0 



25.0 



19.0 



15.5 



16.0 



11.1 



10 



48.5 



42.0 



26.0 



19.0 



19.0 



12.4 



15 



67.5 



59.0 



31.5 



22.0 



21.5 



13.5 



20 



87.5 



78.5 



36.5 



24.5 



23.75 



13.8 



30 



124.0 



112.0 



45.0 



27.5 



28.5 



15.0 



40 



150.0 



140.5 



53.0 



31.25 



30.5 



15.8 



water, while a flume inclined downward at an angle 1 of 30° had used 

 124 liters, or about eight and a third times as much. The table also 

 shows that, with the exception of flumes 39 and 42, the quantity of 

 water used by each flume was in the order represented by the in- 

 clination of the flume from the vertical downward. This table shows 

 that for the flumes inclined downward at angles of 15° and 30° there 

 was not such a great difference in the total quantity of water used. 

 In other words, it would appear that for the flume inclined down- 

 ward at an angle of 15° the capacity of the wick to furnish moisture 

 to the flume from the tank had been about reached. In the two flumes 

 39 and 42, or those inclined up at an angle of 15° and 45°, respec- 

 tively, we find not much difference in the quantity of water used. 

 Just why this condition does exist in this case, there are not sufficient 

 data to indicate clearly. However, flume 42 contains a relatively 

 higher per cent of moisture than does flume 39. This of itself is not 

 quite sufficient to account for the difference. 



On the fortieth day flume 43 had removed from the tank the equiva- 

 lent of 9.64 inches, and flume 34 had removed the equivalent of 91.58 

 inches. These figures are striking in that they show what effect the 



