286 I. Remsen on Sulphosalicylic Acids. 
The salt is thus proved to be derived from a sulphosalicylie 
acid ; and, further, the difference in form an 
it and the needly crystals make it appear probable that the two 
salts are derived from isomeric modifivations of the same acid, 
though, of course, the proof is not given. is supposition is 
rendered still more probable by the fact that when a substitut- 
ing agent is allowed to act upon an aromatic body, in almost 
all cases where it is theoretically possible, two isomeric prod- 
ucts are formed; the formation of but one product being, as 
recent investigations tend to show, a rare exception. 
he ordinary reaction of Dusart, Kekulé and Wurtz could 
be applied with success to the two salts described, it would be 
possible to throw some much-needed light upon the constitu- 
tion of the dioxybenzoic acids, of which we can safely say that 
the constitution of not a single one of the many varieties de- 
scribed is known. Provided we can once establish the fact 
here are, according to Kekulé’s hypothesis, but six varieties 
of these dioxyacids possible, most of 
on, 
sponding reaction between potassic sulphoxybenzoate and 
