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5. ISHERWOOD, F. A. The determination and isolation of organic acids in fruits. Biochem. Jour. 40: 688. 1946. 6. BULEN, W. A. A study of the organic acids of the tomato, Lycopersicum esculentum, Mill. M.S. thesis. The Ohio State University. 1951. 7. WALL, M. E. The role of potassium in plants. III. Nitrogen and carbohydrate metabolism in potassium-deficient plants supplied with either nitrate or ammonium nitrogen. Soil Sci. 49: 393-409. 1940. 8. VICKERY, H. B., PUCHER, G. W., WVAKEMAN, A. J., and LEAVENWORTH, C. S. Chemical investigation of the tobacco plant. VIII. The effect upon the composition of the tobacco plant of the form of nitrogen supplied. Agr. Expt. Sta. Connecticut Bull. No. 442. 119 pp. 1940. 9. PEPKOWITZ, L. P., GILBERT, S. G., and SHIVE, J. W. The importance of oxygen in the nutrient substrate for plant organic acids. Soil Sci. 58: 295303. 1944. 10. MACVICAR, R. and BuiRIs, R. H. Translocation studies in tomato using ammonium sulfate labelled with N'5. Amer. Jour. Bot. 35: 567-570. 1948. 11. TIEDJENS, V. A. Factors affecting assimilation of ammonium and nitrate nitrogen, particularly in tomato and apple. Plant Physiol. 9: 31-57. 1934. 12. CLARK, H. E. Effect of ammonium and nitrate nitrogen on the composition of the tomato. Plant Physiol. 11: 5-24. 1936. 13. WADLEIGH, C. H. and SHIVE, J. W. Organic acid content of corn plants as influenced by pH of substrate and form of nitrogen supplied. Amer. Jour. Bot. 26: 244-248. 1939. 14. LYUBARSKAYA, L. S. The effect of potassium on the nitrogen availability from ammonium and nitrate plants. Chem. Abst. 28: 1130. 1934. 15. LEE, F. A. and SAYRE, C. B. Factors affecting the acid and total acid contents of tomatoes. Agr. Expt. Sta. New York (Geneva) Tech. Bull. No. 278. 1947. 16. CULVERN, J. F. The effect of potassium on the chemical composition of the tomato fruit. M.S. thesis. The Ohio State University. 1948. 17. BRWON, W. S. and GILLAM, W. S. The influence of phosphorus supply and the form of available nitrogen on the nitrogen metabolism of the tomato plant. Plant Physiol. 19: 649-659. 1944. 18. KRAYBILL, H. R. and SMITH, T. 0. Plant metabolism studies. Agr. Expt. Sta. New Hampshire Bull. 212: 7. 1924. 19. ECKERSON, S. H. Influence of phosphorus deficiency on metabolism of the tomato. Contrib. Boyce Thompson Institute 3: 197-217. 1931. 20. VICKERY, H. B., PUCHER, G. W., and CLARK, H. E. Glutamine in the tomato plant. Science 80: 459461. 1934. 21. VARNER, J. E. and BULEN, W. A. An automatic constant-volume fraction collector. Jour. Chem. Educ. 29: 625-626. 1952. 22. MOORE, S. and STEIN, W. H. Photometric ninhydrin method for use in the chromatography of amino acids. Jour. Biol. Chem. 176: 367-388. 1948. 23. GUSTAFSON, F. G. Production of alcohol and acetaldehyde by tomatoes. Plant Physiol. 9: 359-367. 1934.

Nitrogenous Constituents of Sap Exuded from the Sapwood of Acer saccharum.