34 
Journal of Agricultural Research 
Vol. IX. No. a 
Table II. —Moisture conditions found on opening two typical pairs of duplicate cylinders , 
showing concordance of duplicates in the case of the finer-textured soils 
Depth of section. 
Soil C. 
Soil I.' 
Cylin¬ 
der I. 
Cylin¬ 
der II. 
Aver¬ 
age. 
Cylin¬ 
der I. 
Cylin¬ 
der II. 
Aver¬ 
age. 
Inches. 
P. ct. 
P. ct. 
P. ct. 
P. ct. 
P.ct. 
P. ct. 
23. 2 
23. 7 
23. 4 
7.8 
7 * 9 
7.8 
21.7 
22. 6 
22. 1 
7. 3 
7. 6 
7 * 4 
21. I 
21. 4 
21. 2 
7 -1 
7 * 1 
7 * 1 
20. 4 
20. 3 
20. 3 
6.8 
6. 4 
6.6 
I9.9 
20. 5 
20. 2 
6. 5 
6.4 
6.4 
* 9 * 7 
20. 1 
19.9 
6. 3 
6. 1 
6. 2 
19. 1 
19.7 
19.4 
6. 0 
5*9 
5*9 
18. 9 
19. 2 
19. 0 
5 * 7 
5 - 5 
5*6 
17. 6 
18.7 
18. 1 
5*6 
5*o 
5*3 
17. 1 
17.8 
17-4 
5*4 
5*o 
5*2 
16. 6 
17. 0 
16. 8 
5*2 
4. 9 
5 *o 
15.2 
15-7 
15-4 
4.9 
4 * 8 
4.8 
13 * .. 
14. 0 
15.0 
14. 5 
4. 8 
4 - 7 
4 * 7 
13-0 
I 3 - 1 
13-0 
4.9 
4 - 7 
4.8 
12. 8 
13.0 
12. 9 
4 - 7 
4. 6 
4. 6 
12. 6 
12. 8 
12. 7 
4.8 
4 - 5 
4. 6 
12. 4 
I2 * 5 
12. 4 
4.8 
4.4 
4. 6 
18. 
12. 0 
12. 7 
12. 3 
4-8 
4.4 
4.6 
12. 4 
12. 5 
12. 4 
4-8 
4*4 
4. 6 
12. 3 
12. 6 
12. 4 
4. 8 
4 * 5 
4. 6 
12. 3 
12. 6 
12. 4 
4-9 
4.6 
4*7 
12. 3 
12. 3 
12. 3 
4. 8 
4. 6 
4*7 
23 . 
12. 5 
11. 8 
12. 1 
4 - 7 
4 * 7 
4*7 
12. 5 
12. 1 
12. 2 
4. 6 
4*7 
4. 6 
Average. 
I 5 - 9 
16. 3 
16.1 
5*5 
5*3 
5*4 
FINAL WATER CONTENT WHEN SOIL COLUMN IS IN CAPILLARY CON¬ 
NECTION WITH THE NATURAL SUBSOIL AND FULLY PROTECTED 
FROM EVAPORATION 
A.— With a uniform to am. —During the latter part of March, 1913, 
four cylinders 3 feet long, 6 inches in diameter, and open at both ends 
were placed in holes 8 inches in diameter bored in the loess floor of a 
greenhouse. The open space surrounding each cylinder was packed very 
tightly with moist subsoil in order to hold it firmly in place. The air-dried 
soil, J, was filled into the cylinders to a depth of 30 inches, thus bringing 
it to within 6 inches of the top, tamping it as above described (p. 33). 
Thus, direct capillary connection could be established between the soil 
of the cylinders and the natural subsoil, a loess with a hygroscopic coeffi¬ 
cient of about 13. The moisture condition of the latter at a depth of 3 
feet was similar to that in the fields near by. On the surface of the 
tamped soil a 2-inch layer of gravel was placed and 15 pounds of water 
added as rapidly as it soaked away, about 15 hours being required. As 
soon as all the water had been added, the tops of the cylinders were closed 
with tightly fitting covers; and a layer of moist soil, 8 inches in depth, was 
placed over all to prevent any loss by evaporation and also to protect the 
tops of the soil columns from the high temperature prevailing in the 
