PROTEINS. 



but much more so in boiling (1-154) water. Tyrosine forms sol- 

 uble salts with alkalis, ammonia or mineral acids, and is soluble, 



FIG. 22. 



FISCHER APPARATUS. 



Reproduced from a photograph made by Prof. E. T. Reichert, of the University of 

 Pennsylvania. The negative was furnished by Dr. T. B. Osborne, of New Haven, 

 Conn. 



A, Tank into which freezing mixture is pumped and from which it flows through 

 the condenser, B ; C, flask from which the esters are distilled, the distillate being 

 collected in D ; E, a Dewar flask containing liquid air serving as a cooler for con- 

 densing tube F ; G and G' ' , tubes leading to the Geryck pump by which the vacuum is 

 maintained ; I, tube leading to a McLeod gauge (not shown in figure) ; J , a bath con- 

 taining freezing mixture in which the receiver D is immersed ; K, a bath of water 

 during the first part of the distillation and of oil during the last part of the process ; 

 i~5> stop cocks which permit the cutting out of different parts of the apparatus as the 

 procedure demands. 



with difficulty, in acetic acid. It responds to Millon's reaction, thus 

 showing 1 the presence of the hydroxyphenyl group, but gives no 



