Oct. i6 f 1916 
Acidity and Adsorption in Soils 
143 
(8) Several phases of the phenomena designated “adsorption” were 
studied, with special reference to the removal of OH ions by the soil from 
solutions of various hydrates. 
(9) There appears to be a simultaneous removal of positive and nega¬ 
tive ions from solution by soils. 
(10) Some general theoretical considerations with regard to the rela¬ 
tion of adsorption to chemical reactions in soils are presented. 
(11) A convenient method of procedure for utilizing the hydrogen 
electrode in soil studies is described. 
literature cited 
(1) Ames, J. W., and SchoeeenbErger, C. J. 
1916. Comparison of lime requirement methods. In Jour. Indus, and Engin. 
Chem., v. 8, no. 3, p. 243-246. 
(2) Bieeitzer, Jean. 
1903. Eine Theorie der Kolloide und Suspensionen. In Ztschr. Phys. Chem., 
Bd. 45, Heft 3, p. 307-330. 
(3) BoguE, R. H. 
1915. The adsorption of potassium and phosphate ions by typical soils of the 
Connecticut Valley. In Jour. Phys. Chem., v. 19, no. 8, p. 665-695, 
13 %* 
(4) Brown, P. E., and Johnson, H. W. 
1915. The effect of grinding the soil on its reaction as determined by the 
Veitch method. In Jour. Amer. Soc. Agron., v. 7, no. 5, p. 216-220. 
(5) Cameron, F. K. 
1911. The Soil Solution . . . 136 p., 3 fig. Easton, Pa. 
(6) -and Beee, J. M. 
1907. The action of Water and aqueous solutions upon soil carbonates. U. S. 
Dept. Agr. Bur. Soils Bui. 49, 64 p., 5 fig. 
(7) Cearke, F. W., and Steiger, George. 
1902. The action of ammonium chloride upon silicates. U. S. Geof. Survey 
Bui. 207, 57 p. 
(8) Conner, S. D. 
1916. Acid soils and the effect of acid phosphate and other fertilizers upon 
them. In Jour. Indus, and Engin. Chem., v. 8, no. 1, p. 35-40, 2 fig. 
(9) Cook, R. C. 
1916. Effect of grinding on the lime requirement of soils. In Soil Science, 
v. 1, no. 1, p. 95-98. 
(10) Daieuhara, G. 
1914. Ueber saure Mineralbdden. In Bui. Imp. Cent. Agr. Exp. Sta. Japan, 
v. 2, no. 1, p. 1-40, 1 pi. 
(11) Desha, L. J., and Acree, S. F. 
19x1. On difficulties in the use of the hydrogen electrode in the measurement 
of the concentration of hydrogen ions in the presence of organic com¬ 
pounds. In Amer. Chem. Jour., v. 46, no. 6, p. 638-648, 1 fig. 
(12) Fischer, Gustav. 
1914. Die Sauren und Kolloide des Humus. In Kuhn Archiv, V..4, p. 1-36/ 
4 fig. Literaturverzeichnis, p. 135-136. 
(13) GieeEspie, L. J. 
1916. The reaction of soil and measurements of hydrogen-ion concentration. 
In Jour. Wash. Acad. Sci., v. 6, no. 1, p. 7-16, 2 fig. 
