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6. BURSTR6M, HANS. t'ber die Schwermetalkatalyse der Nitratassimilation. Planta 29: 292-305. 1939. 7. HARDING, C. F. and DAVID, J. J. The effect of certain mineral nutrients on the ascorbic acid content of lettuce. Food Research 19: 138-145. 1954. 8. HEWITT, ERIC J. The role of molybdenum as a plant nutrient. Pp. 486-487. Intern. Congr. Biochem., Abstr. of Communs. 1st Cong. Cambridge, England. 1949. 9. HOAGLAND, D. R. Inor ganic plant nutrition. Pp. 1-226. Chronica Botanica, Waltham, Massachusetts. 1944. 10. LOEFFLER, H. J. and PONTING, J. D. Ascorbic acid. Rapid determination in fresh, frozen and dehydrated fruits and vegetables. Ind. Eng. Chem. Anal. Ed. 14: 846-849. 1942. 11. LUCAS, ROBERT E. Effect of copper fertilization on carotene, ascorbic acid, protein and copper contents of plants grown on oirganic soils. Soil Sci. 65: 461-469. 1948. 12. NICHOLAS, D. J. DONALD, NASON, ALVIN, and McELROY, WILLIAM D. Effect of mo'ybdenum deficiency on nitrate redtuetase in cell-free extracts of Neurospora and Aspergillus. Nature 172: 34. 1953. 13. OLSEN, CARSTAN. The significance of concentration for the rate of ion absorption by higher plants in water culture. IV. The influence of hydrogen ion concentration. Physiol. Plantarum 6: 848-858. 1953. 14. STEINBERG, ROBERT A. Role of molybdenum in the utilization of ammonium and nitrate nitrogen by Aspergillus niger. Jour. Agr. Research 55: 891902. 1937. 15. STEINBERG, ROBERT A. Influence of acidity, calcium and magnesium on growth of xanthi tobacco in water culture. Plant Physiol. 26: 47-54. 1951. 16. STEINBERG, ROBERT A. Correlations between proteincarbohydrate metabolism and mineral deficiencies in plants. Pp. 359-386. In: Mineral Nutrition of Plants, Emil Truog, ed. University of Wisconsin Press, Madison. 1951. 17. STEINBERG, ROBERT A. Symptoms of molybdenum deficiency in tobacco. Plant Physiol. 28: 319-322. 1953. 18. STEINBERG, ROBERT A., BOWLING, J. D., and McMURTREY, J. E., JR. AcCUmUlation of free amino acids as a chemical basis for morphological symptoms in tobacco manifesting frenching and deficiency symptorns. Plant Physiol. 25: 279-288. 1950.

Silicon Metabolism in Diatoms. II. Sources of Silicon for Growth of Navicula Pelliculosa.