lo8 BOTANICAL GAZETTE [February 



40. — , The significance of the sulphur in sulphate of ammonia applied to 



certain soils. Soil Science 5:81-86. 1918. 



41. LiPMAN, J. G., and Joffe, J. S., The influence of initial reaction on the 

 oxidation of sulphur and the formation of available phosphates. Soil 

 Science 10:327-332. 1920. 



42. LiPMAN, J. G., and McLean, H. C, Sulphur-phosphate composts under 

 field conditions. Soil Science 5:243-250. 1918. 



43. LiPMAN, J. G., McLean. H. C., and Lint, H. C., Sulphur oxidation in 

 soUs and its effect on the availability of mineral phosphates. Soil Science 

 2:498-538. 1916. 



44. Lyon, T. L., and Bizzell, J., Lysimeter experiments. Cornell Univ. 

 Agric. Exp. Sta. Mem. 12. 19 18. 



45. McCall, a. G., and Smith, A. M., Effect of manure-sulphur composts 

 upon the availability of the potassium of greensands. Jour. Agric. Res. 

 19:239-255. 1920. 



46. McCooL, M. M., and Millar, C. E., Effect of calcium sulphate on the 

 solubility of soils. Jour. Agric. Res. 19:47-54. 1920. 



47. MacIntire, W. H., Willis, L. G., and Holding, W. A., The divergent 

 effects of lime and magnesia upon the conservation of soil sulphur. Soil 

 Science 4:231-237. 1917. 



48. McLean, H. C., The oxidation of sulphur by micro-organisms in its rela- 

 tion to the availability of phosphates. Soil Science 5:251-290. 1918. 



49. McMillar, p. R., Influence of gypsum upon the solubility of potash in 

 soUs. Jour. Agric. Res. 14:61-66. 1918. 



50. Mares, M. H., Des transformations que subit le soufre en poudre (fleur 

 de soufre et soufre triture) quand il est repandu sur le sol. Compt. Rend. 

 Acad. Sci. Paris 69:974-979. 1869. 



51. Miller, H, G., Sulphates affecting plant growth and composition. Jour. 

 Agric. Res. 17:87-101. 1919. 



52. Morse, F. W., and Curry, B. E., The availability of the soil potash in 

 clay and clay loam soils. N. H. Agric. Exp. Sta. Bull. 142. pp. 49-51. 

 1909. 



53. NoLTE, Otto, tlber die Ursache der stickstoffverluste aus Jauche und 

 Stallmist. Landw. Vers. Stat. 96:309-324. 1920. 



54. Olson, Geo. A., Unpublished work of the Chemistry Department, Washing- 

 ton State College. 



55. Peterson, W. H., Forms of sulphur in plant materials and their variation 

 with the soil supply. Jour. Amer. Chem, Soc. 36:1290-1300. 1914. 



56. Pfeiffer, Th., and Blanck, E., Landw. Vers. Stats, 83:359-383. 1914. 



57. Pitz, W., Effect of elemental sulphur and calcium sulphate on certain of 

 the higher and lower forms of plant life. Jour. Agric. Res. 5:771-780. 

 1916. 



58. Reimer, F. C, and Tartar, H. V., Sulphur as a fertilizer for alfalfa in 

 Southern Oregon. Ore. Agric. Exp. Sta. Bull. 163. 1919. 



