56 Scientific Intelligence. 
These did not possess the pre resemblance to the crystals of the 
known acid barium salt of sulphobenzoic acid. They were filtered 
driven of at a temperature lower than 250-2 "The salt has the — 
Hien (x H,,5,0,,) Ba+3H,0. The ee gave the fol- 
lowin bers : 
a H,O 8°95 pr. ct. and 9°38 pr. ct. 
B 25°34 pr. ct. and 25°38 pr. ct. 
Calculated, H,O 9°10 pr. ct. Ba 25°41 pr. ct. 
The mother louse ‘from these needles now evaporated, and 
in this way a salt of entirely different Soponrai ce was obtaine 
After being recr ystallized it formed very regular, beautiful mono- 
clinic er ysta als a resembled the known acid sulphobenzoate of 
arium in every respect.. This salt was also analyzed and the 
e formula Spe ‘for it as forthe needles. The water of crystal- 
estion escaped at 
o) a 9°34 pr. ct. Ba 25°56 pr. ct. t 
Calculated, H,O 9°10 pr. ct. Ba 25°41 pr. ct. 
Although the decided difference in the solubility of the salts and 
in their crystalline form, which constantly presented itself, made 
it exceedingly i improbable, it was still possible that two different 
conditions of the same salt were here under observation and not t 
isomeric salts, parila as Poe seals had shown them to oot 
ek rystalline form was the same. It contained water 
of Sy uiliestioe which was given off at 100°. Its melting point 
was exactly 210°. The cope were very regularly formed and 
possessed a rhother-of-pearl lu 
The nature of the salt that erytalizs in needles is thus ex- 
plained. It is a salt of para-s ni acid. 
Acid para-sulphobenzoate of g ee ett: is difficultly soluble in hot 
water (much more so than the known med Ser salt of meta- 
sulphobenzoic acid), and almost insoluble in cold water. When 
aa it crystallizes from a hot solution Bava the process of filter- 
If it be now redissolved and allowed to stand quietly, beau- 
ned needles are found*in the solution, which fill the en-— 
ee rel on op to tom, 
