26 EF. A. CARLSON 
HARTWELL, B. L., AND KELLOGG, J. W. On the effect of liming 
upon certain constituents of a soil. Rhode Island Agr. Exp. 
Sta. Rept. 1905: 242-252, 1906, 
Hess, ENos H. Effect of various systems of fertilizing upon the 
humus of the soil. Pennsylvania State Coll. Ann. rept. 1899- 
19007: 183-202. 1901. 
JENSEN, CHARLES A. Humus in mulched basins, relation of 
humus content to orange production, and effect of mulches on 
orange production. Journ. agr. res. 12:505-518, 1918. 
KossovicH, P., AND TrersaKoy, I. [Russian title.] On the influ- 
ence of calcium carbonate on the progress of decomposition of 
organic matter. Zhur. Opuitn. Agron. 3:450-484. (Cited in 
Exp. sta. rec. 14:427, 1903.) 1902. 
LIPMAN, J. G., AND BuAtir, A. W. Field experiments on the ayail- 
ability of nitrogenous fertilizers. New Jersey Agr. Exp. Sta. 
Bul. 260 :1-33, 1913, 
The lime factor in permanent soil improvement. I. 
Rotations without legumes. Soil sci. 9:83-90, 1920 a. 
The lime factor in permanent soil improvement. 
II. Rotations with legumes. Soil sci. 9:91-114. 1920 b. 
————— Nitrogen losses under intensive cropping. Soil sci. 
LPSPIBIE Rae pal 
Lyon, T. LYTTLETON, AND BizzELL, JAMES A. Lysimeter experi- 
ments. Cornell Univ. Agr. Exp. Sta. Memoir 12:1-115. 1918. 
McInitre, W. H. Results of thirty years of liming. Pennsvyl- 
vania State Coll. Ann. rept. 1911-127:64-75, 1913. 
Moorrs, C. A., HAMPTON, H. H., aNnD HuNTER, W. K. Fertility 
experiments in a rotation of cowpeas and wheat. Part III. 
The effect of liming and of green manuring on the soil content 
of nitrogen and humus. Univ. Tennessee Agr. Exp. Sta. Bul. 
96 :25-43, 1912, 
Porter, R. S., AND SNypER, R. S. Carbon and nitrogen changes 
in the soil variously treated: soil treated with lime, ammo- 
nium sulfate, and sodium nitrate. Soil sci. 1:76-94. 1916. 
——_ Decomposition of green and stable manures in soil. 
Journ. agr. res. 11:677-698, 1917. 
