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BOTANICAL GAZETTE [FEBRUARY 
LITERATURE CITED 
. Ames, J. W., and Ricumonp, T. E., Fermentation of manure treated with 
sulphur and erarany ae in nitrogen and phosphorus content. 
Soil Science 4: 79-89. 
Effect of Pins sen and nitrification on rock phosphate. Soil 
Science 6:351-364. 1918. 
. BOULLANGER, E., and DucArpin, M., Mechanisme de I’action du soufre. 
Compt. Rend. Acad. Sci. Paris 155:327-329. 1912. 
. Brap ey, C. E., The reaction of lime and gypsum on some Oregon soils. 
Jour. Ind. and Engin. Chem. 2: 529-530. 1910 
. BREZEALE, J.F., and Briccs, L.J., Concentration of potassium in ortho- 
clase solutions ae a measure of its availability to wheat seedlings. Jour. 
Agric. Res. 20:615-621. 1921. 
. Bricos, L. J., and BREzEALE, J. F., Availability of potash in certain ortho- 
clase bearing soils as affected by lime or gypsum. Jour. Agric. Res. 
8:21-28. 1917. 
. Brioux, Cu., and GuERBET, M., L’action fertilisante du soufre. Annales 
Sci. Agron. 30:395-396. 1913. 
Brooks, W. P., Alfalfa. Mass. Agric. Exp. Sta. Bull. 154. 1914 (p. 158). 
, Phosphates in Massachusetts agriculture, importance, selection, 
and use. Mass. Agric. Exp. Sta. Bull. 162. 1915 
. Brown, P. E., and Gwinn, A. R., Effect of sulphur and manure on avail- 
ability of rock phosphate in soil. Iowa Agric. Exp. Sta. Res. Bull. 43: 
373-379- 1917. 
. Brown, P. E., and Kettoce, E. H., Sulphofication in soils. Iowa Agric. 
Exp. Sta. Res. Bull. 18:104-110. 1914. 
. Brown, P. E., and Warner, H. W., The production of available phosphorus 
from rock phosphate by composting with sulphur and manure. Soil 
Science 4: 269-282. 1917. 
. Browne, J. D., The field book of manures or the American muck book. 
1854 (pp. 68-75). 
UCKNER, W. H., American manures. 1872 (p. 65) 
. CROCKER, WsM., History of the use of gypsum as a 5 fertile. (Unpub- 
lished article.) 
Demoton, M. A., Recherches sur I’action fertilisante du soufre. Compt. 
Rend. Acad. Sci. Paris 156:725-728. 1913. 
Dutey, F. L., The relation of sulphur to soil productivity. Jour. Amer. 
Soc. Agron. 8:154-160. 1916. 
. Dymonp, T. S., Hucues, F., and Jupe, C. W. C., The influence of sulphates 
as manures upon the yield and feeding value of crops. Jour. Agric. Sci. 1: 
217~229. 1905 
. Eaton, S. V., Sulphur content of soils and its relation to plant nutrition. 
(Unpublished article.) 
