THE PHYSICAL ACTION OF LIME ON CLAY SOILS 25 



4. Gypsum appears to be an active precipitant of silicic acid and 

 hydrous aluminum oxide. 



5. New methods for the determination of soil expansions and hygro- 

 interstitial water have been devised. 



6. Liming in amounts equivalent to the lime requirement of the soil 

 has no effect on the hygro-interstitial water. 



7. Calcium hydrate is only slightly more valuable as an ameliorating 

 agent than limestone. 



s. The physical effect of precipitated magnesium carbonate on the 

 soil is nil. 



9. The dye adsorption method has the greatest possibilities of all 

 methods for estimating internal surface. 



10. The primary effect of liming is on the silicic acid. 





 BIBLIOGRAPHY 



1. ADAMS, E. A., AND ROSENSTEIN, L. 



1914. The Color and lonization of Crystal Violet. 

 J. Am. Chem. Soc. 36, 1452. 



2. ALBERTA R. 



1905. Welche Erfahrungen liegen bis jetzt tiber den Einflusz 

 kiinstlicher Diingung und Bodenbearbeitung irn forst- 

 lichen Groszbetreibe vor? In welcher Weise und nach 

 welcher Richtung hin sind Versuche hieriiber fernerhin 

 anzustellen? Zeitschr. f. Forst. und Jagdwesen, 37, 139. 



3. AMES, J. W., AND SCHOLLEXBERGER, C. J. 



1916. Liming and lime requirement of soil. Ohio Expt. Sta. 

 Bui. 306. 



4. AMMOX, G. 



1879. Untersuchungen fiber das Condensationsvermogen der 

 Bodenconstituenten fiir Gase. 

 Forsch. a. d. Gebiete der Agrikultur-Physik, 2, 1-46. 



5. ARNTZ, E. 



1909. Tonbestimmung im Boden. 

 Landw. Versuchss., 70, 269. 



6. ASHLEY, H. E. 



1909. The colloidal matter of clay and its measurement. F. S. 

 Geol. Survey Bui. 388. 



7. ASHLEY, H. E. 



1913. Technical control of the colloidal matter of clays. Bureau 

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8. ATTERBERG, A. 



1911. Die Plastizitat der Ton. 



Tnternat. Mitt. f. Bodenkunde, 1, 10. 



