THE DECOMPOSITION OF NITROTOLUYLIC ACID. 
51 
this paper, and more especially the costly nature of the hydrocarbon (cymol), which 
constitutes the (at present) only known source of the parent acid, viz. nitrotoluylic 
acid, form unfortunate barriers to the continuation of the investigation. Cymol, how- 
ever, doubtless exists among the liquid products of the distillation of coal ; indeed, 
Mr. Mansfield, in his valuable memoir on Coal Tar # , describes a fluid which distils 
over between 170° and 1/2° (338° to 342°Fahr.), “which bears so strong a resem- 
blance to cymol in odour, and in other properties, as to induce a belief that this body 
is identical with the hydrocarbon existing in cumin oil.” It is my intention to search 
for it in this fluid, and should it prove possible to obtain it cheaply and in abundance, 
the experiment above suggested, and many others of equal scientific interest, will be 
made, the results of which I shall hope to be allowed the honour of submitting to the 
Royal Society. 
In conclusion, I will give a tabular view of the corresponding members of the 
benzoyl and toluyl groups, the parallelism of which in the present and previous me- 
moir I have had the pleasure of establishing. 
Benzoyl series. Toluyl series. 
ho, c„ ii, o, ho,c 16 h 7 o, 
' y— ' >— y— r - J 
Benzoic acid. Toluylic acid. 
H °, < oj o s . . . 
■ • HO, C l6 
Nitrobenzoic acid. 
c,, {noJ°” nh * • ■ • 
■ — _ — — I 
N itrobenzamide . 
C 2 H 3 (C 12 H 5 )N 2 0 2 . . 
v -V ' 
Anilo-urea. 
"V 
lo 
INOJ 3 
> 
Nitrotoluylic acid. 
jh 6 
. . c 16 | n ^o 2 ,nh 
— I v ! 
N itro toluy lamide . 
. . C 2 H 3 (C 14 H 7 ) n 2 0 2 
v — v ' 
Toluyl- urea. 
HO, C 14 H 6 N0 3 
v ; 
v ; 
Carbanilic acid. 
HO, Ci 6 ii 8 no 3 
Carbo-toluylic acid. 
* Chem. Soc. Quart. Journ. vol. i. p. 244. 
