Reproduction of Non-nitrogenous Acids from Amidic Acids. 557 

 C a H,,0 3 C 8 H r (Na^0 3 C 8 H T (H 2 N)0 ? C 8 H 3 3 



Anisic acid. Nitranisic acid. Amidanisic acid. Anisic acid. 



C 6 H 4 (N0 2 ) 2 C 6 H 3 (N0 2 ) 3 C c 'H 3 !(N0 2 ) 2 (H 2 N)0 C.H^NO^O 



» v / V v ' * Y --• S ^—^ 



Dinitrophenylic Trinitrophenylic Dinitramidophenylic Dinitrophenylic 

 acid. acid. acid. acid. 



It deserves to be noticed, that while amidobenzoic and amidotoluic 

 acid furnish acids isomeric respectively with benzoic and toluic 

 acid*, anisic and dinitrophenylic acid are re-obtained with all their 

 original properties. The properties of salylic acid, and of its deriva- 

 tives, render it probable that salylic acid — and not benzoic as was 

 hitherto assumed — is in the group of aromatic acids the true repre- 

 sentative of acetic acid. Salylic, chlorosalylic, and salicylic acids ex- 

 hibit in fact the same intimate relations which obtain between acetic, 

 chloracetic, and glycolic acids. It is true the same relations may 

 be traced in the composition of benzoic, chlorobenzoic, and oxyben- 

 zoic acids, but the chemical deportment of these substances is altoge- 

 ther different from that of the analogous derivatives of acetic acid. 



Further experiments are necessary to establish this view ; the 

 existence of two varieties of lactic acid, and of alanine and sarcosine, 

 which are both represented by the formula 



C 3 H 7 N0 2 , 

 appears to indicate that similar isomerisms obtain also in the group 

 of fatty acids. 



« On the Ureas of the Diamines." By J. Volhard, Ph.D. 



" Notes of Researches on the Poly-Ammonias." — No. XI. Iso- 

 merism of Diatomic Compounds. By A. W. Hofmann, LL.D., 

 F.R.S. 



" Notes of Researches on the Poly- Ammonias." — No XII. Action 

 of Cyanate of Ethyle on Urea. By A. W. Hofmann, LL.D., F.R.S. 



" Notes of Researches on the Poly- Ammonias." — No. XIII. Deri- 

 vatives of the Phenyle-Series. By A. "VV. Hofmann, LL.D., F.R.S. 



" Notes of Researches on the Poly- Ammonias." — No. XIV. Dia- 

 gnosis of Diamines. By A. W. Hofmann, LL.D., F.R.S. 



"Notes of Researches on the Poly- Ammonias." — No. XV. Mon- 

 acid Polyamines. By A. W. Hofmann, LL.D., F.R.S. 



" Researches on the Phosphorus-Bases." — No. XIII. Sulphuretted 

 Derivatives of Triethylphosphine. ByA.W. Hofmann, LL.D., F.R.S. 



"Researches on the Phosphorus-Bases." — No. XIV. Action of 

 Triethylphosphine on the Substitution- compounds of Marsh-Gas. 

 By A. VV. Hofmann, LL.D., F.R.S. 



* The acid C 8 H 3 0. 2 , described by Strecker, probably belongs to a different 

 group of compounds. In its transformations, and more especially in its conver- 

 sion under the influence of oxidizing agents, into oil of bitter almonds, it differs 

 both from toluic acid and the homologuc of salylic acid. — P. G. 



