686 
ME. P. GrEIESS ON A NEW SEEIES OF BODIES IN 
Besides the compound just described, there exists yet another barium-compound of 
disulphophenylenic acid of the composition G 6 H 4 S 2 Ba 3 H 0 8 , formed by the exchange 
of a third equivalent of the hydrogen for barium. It is obtained by digesting either the 
barium-compound with two atoms of barium, or the free disulphophenylenic acid with 
baryta-water for some time. The excess of baryta is neutralized by carbonic acid, and 
the filtrate evaporated till it begins to crystallize. The new salt forms very thin white 
plates, which, on being left for some time in contact with the mother-liquor, are like- 
wise converted into well-formed prisms. 
This salt differs, moreover, from the salt containing only two equivalents of barium, 
by its greater solubility in water*, and the strong alkalinity of its solutions, which is 
not destroyed by the carbonic acid. When freshly prepared, the crystals of this com- 
pound are clear and transparent ; they soon, however, lose a portion of their water of 
crystallization, and are reduced to a white powder. The substance employed for the 
following analyses was dried at 160° C., at which temperature the water of crystalli- 
zation is rapidly given off. 
I. 0-4518 grm. of substance gave 0-261 grm. of carbonic acid and 0*0396 grm. of water. 
II. 0-3025 grm. gave 0-2225 grm. of sulphate of barium. 
Calculated. 
Found. 
r ~ 
i. 
72 
15-18 
15-75 
H 5 
5 
1-05 
0-97 
s 2 
64 
13-48 
— 
Ba 3 
205-5 
43-31 
— 
o 8 
128 
26-98 
— 
474-5 
100-00 
It is possible that two more barium-salts of disulphophenylenic acid exist, of the 
respective formulae G 6 H 4 S 2 Ba H 3 O g and G 6 H 4 S 2 Ba 4 G 8 . 
Disulphophenylenic acid is likewise capable of combining in two proportions with 
other metals ; with lead it seems to combine even more freely, forming apparently no less 
than five distinct salts, viz. G 6 H 4 S 2 H 3 Pb 0 8 , G fi H 4 -S 2 H 2 Pb 2 0 8 , G 6 H 4 S 2 H Pb 3 0 8 , 
G 6 H 4 -S 2 Pb 4 0 8 , and G 6 H 4 S 2 Pb 4 G 8 + Pb 2 O. 
The description of the preparation and properties of these bodies will be reserved for 
a future communication. The silver-salt of disulphophenylenic acid, however, may find 
a place here, since it exhibits the peculiar chemical deportment of the new acid in a 
striking manner. 
Disulphophenylenate of Silver . — This salt is obtained by treating an aqueous solution 
of the free acid with carbonate of silver, evaporating the filtrate first on the water-bath, 
and lastly over sulphuric acid. It crystallizes either in warty masses or in small plates. 
* On preparing the salt G e H 4 S 2 H 2 Ba 2 0 8 , as described above, with excess of carbonate of barium, a certain 
amount of the second barium-compound is formed, which remains in the mother-liquor from which the first 
salt has crystallized. 
