266 



a corresponding transformation under the influence of sulphuretted 

 hydrogen. 



C 12 H 8 N 4 , (HN0 3 ) 2 +2H 2 S = 2C 6 H 6 S + 2HN0 3 +4N. 



Nitrate of diazophenyl- Phenyl-mercaptan. 



diainmouium. 



It is ohvious that the last reaction supplies a general method for 

 the production of the mercaptans belonging to the homologues of 

 the phenyl-series, the first representative of which was discovered a 

 few months ago by Vogt, who obtained it by submitting the chloride 

 of sulpho-phenyl to the action of hydrogen. 



The observations described in this Note were made in Professor 

 Hofmann's laboratory. 



VII. " Reproduction of Non-Nitrogenous Acids from Amidic 

 Acids." By PETER GBIESS, Esq. Communicated by Dr. 

 HOFMANN. Received May 24, 1861. 



In several previous communications I have pointed out the exist- 

 ence of a peculiar double acid, 



C 14 H U N 3 4 , 



formed by the action of nitrous acid on amidobenzoic acid. This 

 acid, which I have designated as amidodiazobenzoic acid, when 

 again submitted in the presence of hot alcohol to the action of 

 nitrous acid, is changed according to the following equation : 



C 14 H U N 3 4 +2C 2 H 6 + HN0 2 = 2C 7 H 6 2 +2C 2 H 4 + 2H 2 O+4 



Double acid. Alcohol. Nitrous Non-nitroge- Aldehyde, 

 acid. nous acid. 



The non-nitrogenous acid thus reproduced exhibits the composi- 

 tion of benzoic acid ; it differs, however, in its properties essentially 

 from that acid. Since the publication of Kolbe and Lautemann's ex- 

 periments on salylic acid, I have found that the acid in question is 

 identical with the latter. 



Salylic acid may be much more readily obtained by submitting an 



