Feb. II, 1918 Freezing-Point Method and Soil Solution 395 



(5) LiPMAN, C. B. 



1916. PRELIMINARY EXPERIMENTS ON SOME EKECTS OP LEACHING ON THE SOIL 



FLORA. In Soil Science, v. i, no. 3, p. 291-297. Literature cited, 

 p. 297. 



(6) MiTSCHERLICH, E. A. 



1907. EINE CHEMISCHE BODENANALYSE PUR PPLANZBNPHYSIOLOGISCHE POR- 



SCHUNGEN. In Landw. Jahrb., Bd. 36, Heft 2, p. 309-369, 10 figs., 

 ipl. 



(7) Russell, E. J. 



1915. THE ATMOSPHERE OP THE soil: ITS COMPOSITION ANDCAUSES OF VABUATION. 



In Jour. Agr. Sci., v. 7, no. i, p. 1-45, 17 figs. 



(8) Stewart, G. R. 



191 7. effect of season and crop growth in modifying the soil extract. 



In Jour. Agr. Research, v. 12, no. 6, pp. 311-368, 24 fig., i pi. 



(9) Whitney, Milton, and Cameron, F. K. 



1903. THE CHEMISTRY OF THE SOIL AS RELATED TO CROP PRODUCTION. U. S. 



Dept. Agr. Bur. Soils, Bui. 22, 71 p. 



