172 
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Vol. V, No. 4 
to the dry and cold soil increased with temperature and with moisture 
content. But when the moist column of soil was maintained at o° and 
the dry column of soil at 20° and 40° C. for the same number of hours 
there was very little, if any, movement of water from the former to the 
latter. 
These results have led to the conclusion that temperature has a very 
marked influence on the conservation of moisture by mulches. 
LITERATUkE CITED 
(1) Ammon, Georg. 
1879. Untersuchungen fiber das Condensationsvermogen der Bodenconsti- 
tuenten fur Gase. In Forsch. Geb, Agr. Phys., Bd. 2, p. 1-46. 
(2) Briggs, L. J., and Lapham, M. H. 
1902. Capillary studies and filtration of clay from soil solutions. U. S. Dept. 
Agr. Bur. Soils Bui. 19, 40 p., 5 fig. 
(3) -and McLanE, J. W. 
1907. The moisture equivalents of soils. U. S. Dept. Agr. Bur. Soils Bui. 45, 
23 p., 1 fig., 1 pi. 
(4) --and Shantz, H. L. 
1912. The wilting coefficient for different plants and its indirect determination. 
U. S. Dept. Agr. Bur. Plant Indus. Bui. 230, 83 p., 9 fig., 2 pi. 
(5) Buckingham, Edgar. 
1907. Studies on the movement of soil moisture. U. S. Dept. Agr. Bur. Soils 
Bui. 38, 61 p., 23 fig. 
( 6 ) DobenEck, Arnold von. 
1892. Untersuchungen fiber das Adsorptionsvermogen und die Hygroskopizitat 
der Bodenkonstituenten. In Forsch. Geb. Agr. Phys., Bd. 15, p. 
163-228. 
(7) Hilgard, E. W. 
1906. Soils: their Formation, Properties, Composition, and Relation to Climate 
and Plant Growth in the Humid and Arid Regions. 589 p., 89 fig. 
New York, London. 
(8) LAGERGREN, S. 
1899. Ueber die beim benetzen fein verteilter Kdrper auftretende Warmeto- 
nung. In Bihang K. Svenska Vetensk. Akad. Handl., Bd. 24, afd. 
2, no. s, 14 p. 
(9) Ramann, E. 
1911. Bodenkunde. Aufi. 3, 619 p., illus., 11 pi. (1 col.). Berlin. 
(10) Rayleigh, J. W. S. 
1890. On the theory of surface forces. In Phil. Mag. and Jour. Sci., s. 5, v. 30, 
no. 185, p. 285-298, 1 fig.; no. 187, p. 456-475, 1 S 
(11) Saussure, N. T. de 
1814. Observations sur l’absorption des gaz par differents corps. In Ann. 
Phys. [Gilbert], n. F., Bd. 47, p. 113-183. 
