162 Royal Society : — 



logue of urea, and hence the designation aniline-urea, under which 

 I described the new body as the first of the group of compound ureas, 

 which has since been so remarkably enriched by Wurtz and several 

 other chemists. 



The aniline-urea, or phenyl-urea as it is more appropriately called, 

 differs from ordinary urea in its deportment with acids, being, in 

 fact, no longer capable of producing saline compounds. The absence 

 of basic properties in the new phenyl-compound was sufficient to 

 throw some doubt upon its ureic character, and this doubt appeared 

 to receive additional support by Chancel's subsequent discovery of a 

 compound possessing not only the composition of phenyl-urea, but 

 forming likewise well-defined saline combinations. This compound 

 is, however, the amide of amidobenzoic acid, its constitution being 

 interpreted by Chancel, in accordance with its formation : 



C,H c O 



Benzamide 



h In. 



H I 



C 7 (H 4 N0 2 )0 



Nitrobenzamide H [ N. 



H 



C 7 (H 4 NH S 

 Amidobenzamide H 



r 4 NH 2 )0 



h In. 



h 



Nevertheless chemists, by silent but general consent, began to look 

 upon this compound as the true phenyl-urea ; and in most manuals, 

 even Gerhardt's * Traite de Chimie ' not excepted, it figures under 

 this appellation. 



Let us see how far this view is supported by the deportment of 

 this substance. Compound ureas, as I conceive the character of this 

 class, must imitate the deportment of urea par excellence, both in 

 their mode of formation and their products of decomposition. Urea 

 is formed whenever cyanic acid or cyanates corns in contact with 

 ammonia or ammoniacal salts. These are precisely the conditions 

 under which the substance which I have described as phenyl-ureais 

 generated. This compound is obtained by the union of cyanic acid 

 with phenylamine, or of ammonia with cyanate of phenyle. 



On the other hand, no cyanogen-compound is involved in the 

 formation of amidobenzamide, or amidobenzamine, as it might be 

 more appropriately called, on account of its basic properties. 



