184 I. Remsen on Parasulphobenzoie Acid. 
If. 0°5307 grams salt lost 0°494 grams at 200°; and gave 
02078 grams BaSO4=0°12219 grams Ba. 
Calculated. Found. 
(C14H10§2010) 402 67°79 
Ba 137 23°10 23°07 23°02 
3HO?2 54 9°11 8°95 9°31 
593 100°00 
The formula thus deduced, viz: (C7H*®SO*)?Ba + 3H?O, 
is, however, the same as that given for the known salt of sul- 
phobenzoic acid; and hence, though the evidence might be 
strong in favor of considering the analyzed crystals as represent- 
ing a second and new variety of the salt, it was by no means 
conclusive. Two experiments were now made, the results of 
which were decisive. In the first place the mother-liquor from 
the salt obtained was evaporated down, and then yielded a mix- 
ture of two well characterized salts, the long, flat crystals and 
moderately well formed, apparently monoclinic prisms. On 
0°5182 grams salt lost 0°0484 grams at 200°; and gave 0°2038 
grams BaSO4=0-1198 grams Ba. 
Calculated. Found. 
(C141! 02010) ‘402 «67°79 
Ba 137 23°10 *93°12 
3H?0 54 9°11 9°34 
593  100°00 
Again, the acicular crystals were converted into the potassium 
salt, and this melted with potassium hydroxide. The reaction 
variety of sulphobenzoie acid, which, adopting the ordinary 
nomenclature, would naturally be called parasuiphobenzow acrd. 
e presence of this acid in the crude product from the ac- 
‘tion of sulphuric acid in benzoic acid accounts then satisfactorily 
