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11. NOGUCHI, M., K. YAMAMOTO, AND E. TAMAKI. 1961. Studies on the nitrogen metabolism in tobacco plants. A. I. Nitrogenous compounds in the tobacco sap. Agr. Biol. Chem. 25: 626-31. 12. PIERRE, W. H. AND G. G. POHLMANN. 1933. Preliminary studies of the exuded plant sap and the relation between the composition of the sap and the soil solution. Agron. J. 25: 14460. 13. PUCHER, G. W., C. S. LEAVENWORTH, W. D. GINTER, AND H. B. VICKERY. 1947. Studies in the metabolism of Crassulacean plants. The effect upon the composition of Bryophyllum calycinum of the form in which nitrogen is supplied. Plant Physiol. 22: 205-27. 14. RACUSEN, D. W. AND S. ARONOFF. 1954. Metabolism of soybean leaves. VI. Exploratory studies in protein metabolism. Arch. Biochem. Biophys. 51: 68-78. 15. STEEVES, T. A., H. P. GABRIEL, AND M. W. STEEVES. 1957. Growth in sterile culture of excised leaves of flowering plants. Science 126: 350-51. 16. TOLBERT, N. E. AND H. WIEBE. 1955. Phosphorous and sulfur compounds in plant xylem sap. Plant Physiol. 30: 499-504. 17. VICKERY, H. B., G. W. PUCHER, A. WAKEMAN, AND C. S. LEAVENWORTH. 1940. Chemical investigations of the tobacco plant. VIII. The effect upon the composition of the tobacco plant of the form in which the nitrogen is supplied. Conn. Agr. Exp. Sta. Bull. 442: 65-119. 18. WEBSTER, G. C. 1959. Nitrogen Metabolism in Plants. Row-Peterson, Evanston, Illinois. 19. WEISSMAN, G. S. 1951. Nitrogen metabolism of wheat seedlings as influenced by the ammonium: nitrate ratio and the hydrogen-ion concentration. Am. J. Botany 37: 725-38. 20. WEISSMAN, G. S. 1959. Influence of ammonium and nitrate on the proteinand free amino acids in shoots of wheat seedlings. Am. J. Botany 46: 339-46.

Dependence upon Wavelength of Stomatal Movement in Epidermal Tissue of Senecio odoris