CONSTITUTION OF KREATINE. 45 



Urea j arbonic 



Ammonia 



Kreatine 



We have seen that the glycolic residue of hippuric acid may 

 be got rid of by oxidation, so as to leave the benzoic and ammonia 

 residues combined with one another in the form of benzamide. 

 Similarly the glycolic residue of kreatine may be got rid of by 

 oxidation, so as to leave the urea and methylamine residues 

 combined with one another in the form of methyluramine or 

 methyl-guanidine, thus : 



Urea Methylamine Water Methyluramine 



CH 4 N 2 -f CH 5 N - H a O = C a H 7 N 3 



Concluding with these extremely complex animal products, I 

 trust I have satisfied you of the main position with which we 

 started, that highly complex molecules are built up of the re- 

 sidues of comparatively simple molecules, which are capable for 

 the most part of being referred to definite positions in certain 

 natural series or groups of associated bodies in such series as 

 those of the aromatic and fatty acids, aldehydes, alcohols, &c., 

 and in such groups as the benzoic, acetic, propionic, and butyric 

 groups for instance. 



