158 TRANSACTIONS OF THE 
A CAPILLARY TRANSMISSION CONSTANT 
AND METHODS OF DETERMINING 
IT EXPERIMENTALLY. 
BY WILLARD GARDNER. 1 
(Abstract). 
In an article on The Movement of moisture in Soil 
by Capillarity, published in Soil Science, Vol. VII. No. 4, 
April, 1919, the author has implicitly defined a capillary 
transmission constant, involving the dimensions and 
arrangement of the soil particles, and, as a linear factor 
the ratio of the surface tension and the coefficient of vis- 
cosity of the soil solution. From theoretical equations 
there given, this constant may be expressed, 
1 
Fg 
Dp 
where f is the intensity of the capillary stream, i. e., the 
quantity flowing past unit area per unit time; p is the 
moisture density in quantity of moisture per unit aggre- 
gate volume in the soil, and p is the moisture density 
gradient. , 
The present article is concerned primarily with 
a discussion of methods of measuring this constant, 
including a preliminary value for Greenville soil, and 
an example of a practical application. 
1Utah Experiment Station. 
