I, Remsen on Parasulphobenzoie Acid. 185 
the primary reaction. This simultaneous formation of the two 
sulpho-acids is in perfect harmony with known facts, it being 
the rule that, when substitution-products are formed by the 
direct action of subtituting agents upon the mother-substance, 
tinued to Suggest them; some of these were ef etd oie 
ating a mass 
negative imformation of no particular value. : : 
: According to the experiments made, parasulphobenzoie acid 
8 always produced when sulphuric acid acts upon benzoic acid. 
hot impossible, to obtain it in a pure condition. On prepar! 
the acid barium salt, and evaporating the 
tallize out together, the long se foraee generally pean ian 
en — . 
"pon and among these in such a complicated manner that the 
* Berliner Berichte, ii Jahrgang, S. 330. 
