Selected Bi]:)li()graphv 245 



3. Iloiikins, C C, ami Wliitiiiji, A. L., Soil bacteria and phospliatrs, ///. Afir. 

 Expt. Sta. Bull. 190, 1916. 



4. JiMison, C. A., Efh'tt of ck'foinposint^ orsfanif matlrr on llu' soluhility ol 

 certain inorganic constituents ot tlie soil, J. Agr. Research, 9:253-268, 1917. 



5. Jofle, J. S., The role of snUnr in ajiricnltnrc, N. J. Aur. Expt. Sta. Bull. 374, 

 1922. 



6. Joflc, J. S., and McLean, II. C, Alkali soil in\ estit^ations, Soil Sci., 17:395- 

 409, 1924; 18:13-30, 133-149, 237-251, 1924. 



7. Kelley, W. P., Effect of nitrifying bacteria on the solnbilit\- of tricalcinni 

 phosphate, /. Afii: Research, 12:671-683, 1918. 



8. Lipnian, J. C, McLean, H. C, and Lint, H. C, Snlfnr o.xidation in soils 

 and its effect on the a\ailabilit\' of mineral phosphates, So/7 Sn'., 2:499-538, 

 1916. 



9. Rudolfs, W'., and Hellbroniier, A., Oxidation of zinc snifide liy microorgan- 

 isms. Soil Sci., 14:459-464, 1922; Compt. rend., 174:1378-1380, 1922. 



10. Teakle, L. J. H., Phosphate in the soil solution as affected by reaction and 

 cation concentrations. Soil Sci., 25:143-162, 1928. 



11. Waksman, S. A., and Joffe, J. S., The chemistry of the oxidation of sulfur 

 by microorganisms to sulfuric acid and the transformation of insoluble phos- 

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12. ^^'aksman, S. A., and Starkex', R. L., On the growth and respiration of sulfur- 

 oxidizing bacteria, J. Gen. Physiol, 5:28.5-310, 1923. 



13. Whiting, A. L., Inorganic substances, especially aluminum, in relation to 

 the acti\ities of soil organisms, J. Am. Soc. Agron., 15:277-289, 1923. 



14. Wright, D., Equilibrium studies with certain acids and minerals and their 

 probable relation to the decomi^osition of minerals by bacteria, Univ. Calif. 

 Publ. Agr. Sci., 4:247-337, 1922. 



