CAPILLARY MOVEMENT OF SOIL MOISTURE. 
Table 36. — Flume J t 3. 
49 
Logx 
Logy 
1.224 
ii * 
X 
days. 
y 
inches. 
(log 
days). 
(log 
inches). 
+ .186 
logz. 
(inches). 
A 
1 
15.70 

1.196 
1.224 
16.75 
+1.05 
2 
18.95 
.301 
1.278 
1.280 
19.05 
+0.10 
3 
20.75 
.477 
1.317 
1.313 
20.56 
-0.19 
4 
22.00 
.602 
1.342 
1.336 
21.68 
-0.32 
5 
22.82 
.699 
1.358 
1.354 
22.59 
-0.23 
6 
23.75 
.778 
1.376 
1.369 
23.39 
-0.36 
7 
24.45 
.845 
1.388 
1.381 
24.04 
-0.41 
9 
25.25 
.954 
1.402 
1.402 
25.24 
-0.01 
If 
25.75 
1.000 
1.411 
1.410 
25.70 
-0.05 
11 
26.25 
1.041 
1.419 
1.419 
26.25 
0.00 
12 
26.75 
1.079 
1.427 
1.425 
26.61 
-0.14 
13 
27.15 
1.114 
1.434 
1.431 
26.98 
-0.17 
15 
27.75 
1.176 
1.443 
1.443 
27.75 
0.00 
17 
28.37 
1.230 
1.453 
1.453 
28.37 
0.00 
28 
31.00 
1.447 
1.491 
1.493 
31.12 
+0.12 
39 
33.00 
1.591 
1.519 
1.520 
33.11 
+0.11 
48 
34.00 
1.681 
1.531 
1.536 
34.36 
+0.36 
50 
34.75 
1.699 
1.541 
1.540 
34.68 
-0.07 
* y c , distance in inches computed by using the formula derived for flume 43. 
The 18 sets of observations are divided into two groups of 9 each. 
The sum of the first 9 log x and log y are found, together with the 
second group of 9. These are indicated as 29 in the computations. 
Since the formula log y= log a + n log a? applies to all parts of the 
curve, it is the same for the two groups, subtracting the two groups 
from each other eliminates log a and dividing the one difference A by 
the other gives the exponent ft, 
n 
log y\ 
log y, 
log x 2 — log x x 
The sum of all the values of log x, S 1S , is found and multiplied by 
ft, and the product subtracted from the sum of all the log y, log a = 
log y— ft log x. The difference, A, is divided by 18 and the quotient 
is the log a. 
The actual computations for the above case are as follows : 
log x S 9 = 5.657 
S 9 = 12.060 
lo 
6.403 
1.191 
12.068 
13.259 
1.191 
6.403 
S 18 = 17.716 
17.716 x 0.186 = 
0.186 
log w 
log i/S 18 = 25.327 
3.295 
A = 
22.032 -+- 18 = 1.224 = log a 
a — 16.75 
y = 16.75* 0186 
147697°— 20— Bull. 835 4 
22.032 
