62 



THE ALBUMINS. 



be isolated after forty-eight hours (in the case of edestin), while of 

 glutaminic acid only 7.4 per cent, is obtained at that time. Cystin 

 and tryptophan appear as rapidly as tyrosin, while alanin, leucin, 

 amino-valerianic acid, and aspartic acid are split off more gradually, 

 like glutaminic acid. 



The interrelation between these various products is seen in the 

 following schema : 



Albumin 



Albumoses 

 Peptone (?) 



Polypeptid 

 Or, more specifically : 



Tyrosin, tryptophan, cystin, alanin, 

 amino-valerianic acid, leucin, aspar- 

 tic acid, glutaminic acid, histidin, 

 lysin, arginin. 



Albumin 



Albumose Albumose 



Ammo-acid Polypeptid Polypeptid Amino-acid Amino-acid Polypeptid 



(highly 

 molecular 

 Albumose (. polypeptids) 



Decap ptid 



Amino-acid 



Pentapeptid 



Amino-acid 



Tetrapeptid 



Amino-acid 



Tetrapeptid 



Amino-acid 



Amino-acid 



Decapeptid 

 Amino-acid 



Pentapeptid 



Tripeptid Dipeptid J 



Amino-acid Dipeptid Amino-acid Amino-acid 

 Amino-acid Amino-acid 



Dipeptid 



Amino-acid. 



The term protones has been applied by Kossel to products which 

 result from the protamins on digestion with trypsin and which stand 

 intermediate between these and the end-products. Like the pro- 

 tamins, they turn the plane of polarization to the left, but to a less 

 extent, and with cupric oxide they form a violet compound. From 

 clupein Goto obtained a clupeon which corresponded to the formula 

 C^H^N^Og ; in this 80 per cent, of the total nitrogen was present 

 as arginin. A corresponding sturon gave the formula 

 As a class the protones are but little known. 



