16 MASS. EXPERIMENT STATION BULLETIN^406 



LITERATURE CITED 



(1) Zuntz, N. Pfliigers Arch. f. die Gesam. Physiol., 49, 477. 1891. 



(2) Mitchell, H. H., and Hamilton, T. S. The Biochemistry of the Amino 



Acids, p. 588. The Chemical Catalog Co., New York. 1929. 



(3) Krebs, K. Biedermann's Zentbl. f. Agr. Chem., Abt. B. Tiererniihrung, 



9,4-6,394-507. 1937. 



(4) Marston, H. R. Annual Review of Biochemistr\-, 8, 565. 1939. 



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 4M 7-43-12304. 



