182 I. Remsen on Parasulphobenzoie Acid. 
acid—its crystalline form, fusing point, water of crystalliza- 
tion, ete. 
e. : 
According to Barth, the basic barium salt of paraoxybenzoie 
acid is easily formed by the addition of an excess of barium 
hydroxide to a somewhat concentrated solution of the acid ; and 
this salt, being insoluble, or nearly so, is precipitated under these 
circumstances, whereas no corresponding salt of oxybenzole 
acid is formed. Taking advantage of this fact, the solution of 
times from water. It is very possible that a pure su 
may be obtained in this way, but it is a difficult matter to prove 
