CHAP. III.] 



TRYPTOPHAN. 



265 



sible, and that its solutions exhibited an absorption band in the 

 vicinity of D. * 



For the discussion of many facts concerning tryptophan, and for 

 the description of painstaking methods employed in the attempted 

 separation of the body, the reader is referred to a paper on the 

 subject by Stadelmann 1 . 



1 E. Stadelmann, ' Ueber das beim tiefen Zerfall der Eiweisskorper entstehende 

 Protemochromogen, den die Bromreaction gebenden Korper,' Zeitschrift f. Biologic, 

 Vol. xxvi. (1890), pp. 491526. 



