Mar. ij, is,i8 Nitrifying Bacteria and Tricalcium Phosphate 683 



LITERATURE CITED 

 (i) Cameron, F. K., and Bell, J. M. 



1907. THE ACTION OF WATER AND AQUEOUS SOLUTIONS UPON SOIL PHOSPHATES." 



U. S. Dept. Agr. Bur. Soils Bui. 41, 58 p., 5 fig. 



(2) Gaither, E. W. 



191 2. a new apparatus for the determination op carbon dioxide. in 



Jotir. Indus, and Engin. Chem., v. 4, no. 8, p. 611-613, 2 fig. 



(3) Hopkins, C. G., and Whiting, A. L. 



1916. soil BACTERIA AND PHOSPHATES. 111. Agr. Exp. Sta. Bui. 190, p. 395-406. 

 Foreword by E. Davenport. 



(4) Kellev, W. p. 



1916. NITRIFICATION IN SEMIARID SOILS, I. In JouT. Agr. Research, v. 7, no. 

 10, p. 417-437. Literature cited, p. 436-437. 



(5) LiFMAN, J. G., McLean, H. C, and Lint, H. C. 



I916. SULFUR OXIDATION IN SOILS AND ITS EFFECT ON THE AVAILABILITY OK 



MINERAL PHOSPHATES. In Soil Sci., V. 2, no. 6, p. 499-538, 5 fig. 

 Literature cited, p. 535-538. 



(6) LuPTON, N. T. 



1893. THE EFFECT OF DECOMPOSING ORGANIC MATTER ON NATURAL PHOS- 

 PHATES. In Ala. Agr. Exp. Sta. Bui. 48, p. i-io. 



(7) McDowell, M. S. 



1908. is the phosphoric acid op floats made soluble by rotting manure? 



In Pa. Agr. Exp. Sta., Ann. Rpt., 1907-08, p. 175-178. 



(8) ToTTiNGHAM, W. E., and Hoffmann, C. 



1913. NATURE of the CHANGES IN THE SOLUBILITY AND AVAILABILITY OF 



PHOSPHORUS IN FERMENTING MIXTURES. Wis. AgT. Exp. Stfi. Research 

 Bui. 29, p. 275-321, 3 fig. 



(9) Truog, E. 



1912. factors influencing the availability of rock phosphate. wjs. 



Agr. Exp. Sta. Research Bui. 2c, p. 17-51, 4 fig. 

 38325°— 18 6 



