MINERAL CONSTITUENTS 141 



REFERENCES 



1 Briggs, L. J., Martin, F. O., and Pearce, J. R., Bulletin 24, Bureau of Soils, 

 U.S.D.A., The Centrifugal Method of Soil Analysis, 1904, p. 33. 



'Wilev, H. VV., Principles and Practice of Agricultural Analysis, 1906, p. 

 231. 



* Op. Cit., p. 246. 



4 Bulletin 24, Bureau of Soils, 1904, p. 12. 



Yoder, P. A., Bulletin 89, Utah Station, The New Centrifugal Soil 

 Elutriator, 1904. 



King, F. H., Physics of Agriculture, 1907, p. 121. 



T Zt. f. phys. Chem., Leipsic, 9. 88 (1802). 



1 Unpublished data, Soil Physics Division, University of Illinois. 



General References. Fletcher. C. C., and Bryan, H., Bulletin 84, 

 Bureau of Soils, U.S.U.A., Modification of the Method of Mechanical 

 Analysis, 1912. Rohland, Paul. The Colloidal and Crystalloidal States of 

 Matter, 1914, I). Von Nostrand Co., New York. Hatschek, Emil, An Intro- 

 duction to the Physics and Chemistry of Colloids, 1913, J. & A. Churchill, 

 Ix>ndon. Oatwald, translated by Fischer, Handbook of Colloid-Chemistry, 

 1915, P. Blakiston'a Sons & Co., Philadelphia. 



