142 



Journal of Agricultural Research 



Vol. X, No. 3 



With a Large Source of Moisture Supply 



In the second experiment on the effect of gravity a tub similar to 

 one described in a previous experiment was used. In this case the 

 brass tubes were filled with Greenville loam having a moisture content 

 of 5.54 per cent, while the tub contained Greenville loam with a mois- 

 ture percentage of 30.25. 



Fig. 23. — Diagram showing the effect of gravity on the quantity of water moved by capillarity through 

 Greenville loam from similar soil containing 30.25 per cent of water as the source of supply. 



The brass tubes were arranged in the form of a wheel, so that two 

 were vertical, two horizontal, and four at angles of 45°. At the end 

 of the experiment, which lasted from May 26 until September 13, 1916, 

 the tubes, which had been weighed before being placed in contact with 

 the moist soil, were taken down, reweighed, and the moisture content 

 determined for each 2 -inch section. 



Figure 23 represents diagrammatically the position of the tubes and 

 the moisture gained by each tube, the length of the Une in the figure 

 representing the moisture gained. 



