104 Mineral Nutrition of Plants 



13. Dean, L. A., Adv. in Agronomy, 1:391 (1949). 



14. Dickman, S. R., and Bray, R. H., Soil Sci., 52:263 (1941). 



15. Egner, H., Kohler, G., and Nydahl, F., Ann. landw. Hochschule 

 Schived., 6:253 (1938). 



16. Evans, C. A., and Rost, C. O., Soil Sci., 59:125 (1945). 



17. Gerretsen, F. C, Plant and Soil, 1:51 (1948). 



18. Hevesy, G., Biochem. ]., 17:439 (1923). 



19. , Linderstrom-Lang, K., and Olsen, C, Nature, 137:66 (1936). 



20. , Nature, 139:149 (1937). 



21. Hevesy, G., Linderstrom-Lang, K., and Nielsen, N., Nature, 140:725 



(i937)- 



22. Hunter, A. S., and Kelly, O. J., Plant Physiol., 21:445 (1946). 



23. Jacobson, L., and Overstreet, R., Am. /. Botany, 34:415 (1947). 



24. Jenny, H., and Overstreet, R., Proc. Nat. Acad. Sci. U. S., 24:384 

 (1938). 



25. , and Overstreet, R., /. Phys. Chem., 43:1185 (1939). 



26. , and Ayers, A. D., Soil Sci., 48:9 (1939). 



27. Jenny, H., and Ayers, A. D., Soil Sci., 48:443 (1939). 



28. Kelley, W. P., Soil Sci., 47:367 (1939). 



29. Lundegardh, H., Ar\iv. f. Bot., 32A, No. 12:1 (1945). 



30. McAuliffe, C. D., Hall, N. S., Dean, L. A., and Hendricks, S. B., 

 Soil Sci. Soc. Am. Proc, 12:119 (1947). 



31. Mattson, S., and Karlsson, N, Ann. Agr. Coll. Sweden, 6:109 

 (1938). 



32. Mattson, S., Eriksson, E., Vahtras, K., and Williams, E. G., Ann. 

 Roy. Agr. Coll. Sweden, 16:457 (1949). 



33. Mullins, L. J., and Brooks, A. C, Science, 90:256 (1939). 



34. Olson, A. R., and Simonson, T. R., /. Chem. Phys., 17:1167 (1949). 



35. Olson, R. V., and Berger, K. C, Soil Sci. Soc. Am. Proc, 11:216 

 (1946). 



36. Osterhout, W. J. V., Botan. Rev., 2:283 (1936). 



37. Overstreet, R., and Jenny, H., Soil Sci. Soc. Am. Proc, 4:125 (1939). 



38. Overstreet, R., and Broyer, T. C, Proc Nat. Acad. Sci. U. S., 26:16 



(1940). 



39. Overstreet, R., and Jacobson, L., Am. J. Botany, 33:107 (1946). 



40. Parker, F. W., Soil Sci., 12:209 (1921). 



41. Reitemeier, R. F., Soil Sci., 61:195 (1946). 



42. Salter, R. M., and Barnes, E. E., Ohio Agr. Expt. Sta. Bull. 553 



(i935)- 



43. Steele, G. J., in Abstracts of Doctors' Dissertations, No. 15 (Columbus, 



O., Ohio State Univ. Press, 1935), p. 203. 



