50 
DR. NOAD ON SOME OF THE PRODUCTS OF 
requires 
Carbon 63*57 
Hydrogen .... 5*95 
and that of AgO, C l6 H 8 N0 3 requires 
Carbon 37*21 
Hydrogen . . . . 3*10 
Silver 41*86 
The numbers actually obtained from the analysis of the acid and its silver salt are. 
for the acid, — 
Mean. 
Carbon 63*34 
Hydrogen . . . . 6*18 
for the silver salt, — 
Carbon 37*02 
Hydrogen .... 3*32 
Silver ..... 41*66 
This acid, for which I propose the provisional name of Carbo-toluylic acid, has 
several representatives in the benzoyl series, viz. anthranilic acid, obtained by 
Fritzsche by the action of caustic potash on indigo ; benzamic acid, the product of 
the action of hydrosulphuric acid on nitrobenzoic acid discovered by Zinin ; and, 
lastly, carbanilic acid, prepared by Chancel, by treating nitrobenzamide with hydro- 
sulphuric acid. Of these three acids, which are all represented by the formula 
c u h 7 no 4 =c i6 h 9 no 4 -c 2 h 2 , 
benzamic and carbanilic acids have lately been found by M. Gerland* to be identical, 
while anthranilic acid is a body of a different type. It remains to be examined, to 
which of these two acids, whether to anthranilic or to carbanilic acids, the new acid 
above described corresponds. The mode of its generation would render it pro- 
bable that it is homologous to carbanilic acid, whence the provisional name I have 
assigned to it; should it however prove on further examination to correspond rather 
to anthranilic acid, then the convertibility of this acid into salicylic acid by means 
of nitrous acid, first suggested by Dr. HoFMANN-f-, and lately experimentally confirmed 
by M. Gerland^:, would appear to indicate that the analogous transformation of the 
new acid would furnish a series of new substances which at present are entirely wanting, 
namely, the proper hoinologues of salicylic acid and its derivatives. Thus: — 
HO, c 14 h 6 no 3 +no 3 =ho, C 14 H 5 0 5 +2N+H0 
Anthranilic acid. Salicylic acid. 
HO, c 16 h 8 no 3 +no 3 =ho, C i6 H 7 0 5 +2N+H0 
New acid. Homologue of 
salicylic acid. 
The extreme difficulty however of preparing the different substances described in 
* Quart. Journ. Chem. Soc. vol. v. p. 133. f Ibid. vol. iii. p. 235. t Ibid. vol. v. p. 133. 
