Nov. 1, 1919 Carbonates of Calcium and Magnesium on A cid Soils 125 



benefited more by magnesium carbonate, while wheat and clover gave 

 greater increases with calcium than with magnesium carbonate. 



(6) Magnesite in all instances increased the concentrations of soluble 

 salts in the soils more than calcite. 



(7) Carbon dioxid determinations snowed that the carbonates were not 

 entirely decomposed at the end of one year. The decomposition of the 

 magnesite seems to have proceeded faster than that of the calcite. 



(8) Magnesite produced more favorable conditions for nitrification than 

 did calcite. 



(9) Magnesite encouraged the multiplication of both aerobic and anae- 

 robic bacteria on the yellow clay soil more than caldte did. On the black 

 sand soil the reverse was true. Calcite increased the bacterial content 

 of the soil more than did magnesite. 



LITERATURE CITED 

 (i) CouPiN, Henri. 



I918. ACTION NOave DU CARBONATE DE MAGNESIUM SUR LES VtotTAVX. In 



Compt. Rend. Acad. Sci. [Paris], t. 166, no. 24, p. ioo6-ic5o8. 



(2) Dickson, James Geere. 



1918. THE VALUE OF certain NUTRITIVE ELEMENTS IN THE DEVELOPMENT OP 



THE OAT PLANT. In Amer. Jour. Bot., v. 5, no. 6, p. 301-324, 5 fig. 



(3) FULMER, H. L. 



igiS. INFLUENCE OF CARBONATES OF MAGNESIUM AND CALCIUM ON BACTERIA 



OF CERTAIN WISCONSIN SOILS. In Jour. Agr. Research, v. 12, no. 8, 

 p. 463-504, II fig. Literature cited, p. 500-504. 



(4) KellEY, W. p. 



i917. the action of precipitated magnesium carbonate on soils. in 

 Jour. Amer. Soc. Agron., v. 9, no. 6, p. 285-297. Literature cited, p. 295- 

 297. 



(5) LiPMAN, Charles B. 



1916. A CRITIQUE OF THE HYPOTHESIS OF THE LIME-MAGNESIA RATIO. In Plant 



World, V. 19, no. 4, p. 83-105; no. 5, p. 119-135. 



(6) MacIntire, W. H., Willis, L. G., and Hardy, J. I. 



I914. THE NONEXISTENCE OP MAGNESIUM CARBONATE IN HUMID SOILS. Tenn, 



Agr. Expt. Sta. Bui. 107, p. 151-202, illus. 



(7) NoYES, H. A., and Conner, S. D. 



1919. NITRATES, NITRIFICATION, AND BACTERIAL CONTENTS OF FIVE TYPICAL 



ACID SOILS AS AFFECTED BY LIME, FERTILIZER, CROPS, AND MOISTURE. 



In Jour. Agr. Research, v. 16, no. 2, p. 27-42, 2 fig., pi. 1-9. Literature 

 cited, p. 41-42. 



(8) Waynick, Dean David. 



1918. THE CHEMICAL COMPOSITION OF THE PLANT AS FURTHER PROOF OF THE 

 CLOSE RELATION BETWEEN ANTAGONISM AND CELL PERMEABILITY. In 



Univ. Cal. Pub. Agr. Sci., v. 3, no. 8, p. 135-242, pi. 13-24. 



