1916] SOILS FERTILIZERS. 19 



Soil survey of Fond dii Lac County, Wisconsin, A. R. Whitson, W. J. 

 Geib, L. K. Schoenmann, F. L. INIusbach, G. Conkey, and A. E. Taylor (Wis. 

 Gcol. and Nat. Hist. Survey Bui. S7 U'JlJt), Soil Sir. 7, pp. 8//, pis. 5, figs. 2, 

 map 1). — This survey, made in eooperiition with the Bureau of Soils of this 

 Department, was noted in the report of the field operations of that Bureau for 

 1911 (E. S. 11., 31, p. 513). 



Soil survey of Juneau County, Wisconsin, A. R. Whitson, W. J. Geib, 

 L. R. ScHOENMANN, C. A. Leclaik, O. E. Bakeb, and E. B. Watson {Wis. 

 Gcol. ajtd Nat. Hist. Survey Bid. 3S {19U), Soil Scr. 8, pp. 92, pis. 5, figs. 2, 

 map 1). — This survey, made in cooperation with the Bureau of Soils of this 

 Department, was noted in the report of the field operations of that Bureau for 

 1911 (E. S. R., 31, p. 513). 



Soil survey of Kewaunee County, Wisconsin, A. R. Whitson, W. J. Geib, 

 E. J. Graul, and A. H. Meyer (His. Geol. and Nat. Hist. Survey Bui. 39 

 (1914), Soil Ser. 9, pp. 83, pis. 3, figs. 2, map 1). — ^This survey, made in co- 

 operation with tlie Bureau of Soils of this Department, was noted in the report 

 of the field operations of that Bureau for 1911 (E. S. R., 31, p. 513). 



Soil survey of La Crosse County, Wisconsin, A. R. Whitson, W. J. Geib, 

 T. J. Dunnewald, and C. Lounsbuky (IT'/s. Geol. and Nat. Hist. Survey Bui. 

 40 (1914), ^oil Ser. 10, pp. 76, pis. 5, figs. 2, map 1).— -This survey, made in 

 cooperation with the Bureau of Soils of this Department, was noted in the re- 

 port of the field operations of that Bureau for 1911 (E. S. R., 31, p. 513). 



The chemical composition of virgin and cropped Indiana soils, S. D. Con- 

 ner (Proc. Ind. Acad. Sci., 1914, pp. 359-363). — Chemical analyses, made at 

 the Indiana Experiment Station, of 31 composite samples of virgin and cropped 

 Indiana soils and subsoils (the top 6.5 in. and the layer from a depth of 12 to 

 18 in.) show that "the most serious losses from the standpoint of soil fertility 

 are those of nitrogen, which shows a loss of 28 per cent, and the organic matter, 

 which shows a loss in the volatile matter of 26 per cent and in the humus of 47 

 per cent. . . . While the phosphoric acid and potash show only about 10 

 per cent loss this 10 per cent was the most available portion of these impor- 

 tant elements." There was little difference in the contents of sulphur, calcium, 

 and magnesium in virgin and cropped soils, but quite a loss of manganese in 

 the cropped soil. "While the acidity of the cropped soil has increased, the 

 acidity of the cropped subsoil has decreased." 



Plant food in Aroostook soils, C. D. Woods (Maine Sta. Bui. 246 (1916), 

 pp. 14-16). — Analyses of ten samples of the soils of Aroostook County, Me., are 

 reported showing total nitrogen varying from 0.113 to 0.281 per cent, potash 

 soluble in hot strong hydrochloric acid varying from 0.27 to 0.369 per cent, 

 phosphoric acid soluble in hot strong hydrochloric acid varying from 0.151 to 

 0.32 per cent, and lime varying from 0.11 to 0.31 per cent. 



A peculiar clay from near the City of Mexico, E. W. Hilgard (Proc. Nat. 

 Acad. Sci., 2 (1916), No. 1, pp. S-i 2). —Attention is drawn to a new type of 

 so-called clay soil, samples of which were obtained from an unproductive farm 

 in the vicinity of Mexico City, Mexico. 



The clay showed marked swelling properties in contact with water and was 

 very plastic when wet. After protracted boiling of a sample of the clay " the 

 suspension . . . showed a multitude of dark rounded particles, very uniformly 

 distributed through a colloidal medium of faintly yellowish tint. ... All at- 

 tempts to free the colloidal ingredients from the visibly discrete particles by 

 sedimentation proved futile. The suspension was readily coagulated and pre- 

 cinitated, apparently unchanged, by a solution of sodium chlorid. On washing 

 by decantation the suspension was again readily made, the microscopic charac- 

 ter also remaining the same." 



