[39] Löhnis, F., “Ammonification of cyanamid,” Ztschr. f. Gärungsphysiol., 1914, v.

[40] Marchal, E., “Sur la production de l’ammoniaque dans le sol par les microbes,” Bull. Acad. Roy. Sci. Belg., 1893, 25.

[41] Mazé, P., Vila et Lemoigne, “Transformation de la cyanamide en urée par les microbes du sol,” Compt. Rend. Acad. Sci., Paris, 1919, 169.

[42] McBeth, I. G., “Studies on the decomposition of cellulose in soils,” Soil Sci., 1916, I.

[43] McBeth, I. G., and Scales, F. M., “The destruction of cellulose by bacteria and filamentous fungi,” U.S. Dept. Agric, Bur. Pl. Ind., 1913, Bull. 266.

[44] McLean, H. C, and Wilson, G. W., “Ammonification studies with soil fungi,” New Jersey Agric. Expt. Sta., 1914, Bull. 270.

[45] Melin, E., “Ueber die mykorrhizenpilze von Pinus silvestris (L.) und Picea abies (L.), Karst.” Svensk. Botan. Tidskr., 1921, xv.

[46] Muntz, A., and Coudon, H., “La fermentation ammoniaque de la terre,” Compt. Rend. Acad. Sci., Paris, 1893, 116.

[47] Neller, J. R., “Studies on the Correlation between the production of carbon dioxide and the accumulation of ammonia by soil organisms,” Soil Sci., 1918, 5.

[48] Otto, H, “Untersuchungen über die Auflösung von Zellulosen und Zellwänden durch Pilze,” Dissert., Berlin, 1916.