476 MR. G. B. BUCKTON AND DR. A. W. HOFMANN’S RESEARCHES ON THE 
It was dissolved in cold water, and separated from a black, almost insoluble matter, 
which appeared to be somewhat crystalline. 
Disulphardlate of Barium. 
After saturating with carbonate of barium the liquid was evaporated to dryness, by 
which treatment a further separation of the black substance was effected, and the 
barium-salt was much improved in colour. 
Jf the barium-salt be redissolved and the solution evaporated on the water-bath, a 
horny substance is formed, which on cooling splits by cracks in all directions ; but if 
the evaporation be completed under the receiver of an air-pump, a mass of microscopic 
crystals appear, insoluble in alcohol and in ether. 
In preparing the new barium- salt, we have found it convenient to precipitate the 
liquid gradually by alcohol, and to reject, as retaining generally traces of sulphani- 
late, the precipitate first formed. Under all circumstances it is very difficult entirely 
to lemove all colouring matter from the solutions of this salt, which is usually of a 
pale rose colour. 
0'4679grm., at 200°, gave 0‘2810grm, of sulphate of barium; 
0‘3620grm., at 190°, gave 0‘4310grm. of sulphate of barium, 
which numbers agree well with the formula of disulphanilate of barium. 
c. 
(H,Ba,)NS. 
12 equivs. of Carbon . . 
( 
. . 72 
Theory, 
A 
18-58 
Experiment. 
5 equivs. of Hydrogen . 
. . 5 
1-28 
2 equivs. of Barium 
. . 137 
35-30 
35-30 
1 equiv. of Nitrogen 
. . 14 
3-60 
4 equivs. of Sulphur 
. . 64 
16-49 
16-32 
12 equivs. of Oxygen 
. . 96 
24-75 
388 
100-00 
Disulphanilate of barium blackens without inflaming when heated on foil, in which 
respect it differs from the sulphanilate, which burns with a bright but smoky flame. 
Heated in close vessels it furnishes a vapour, which sublimes in beautiful crystals, 
probably of sulphite of aniline, obtained under similar circumstances from sulphanilic 
acid. 
Disulphanilate of barium is attacked by concentrated nitric acid and gives a yellow 
liquid, which furnishes on evaporation crystals of a very bitter taste ; sulphate of 
barium is formed at the same time. 
Disulphanilic Acid 
is easily produced from a lead-salt. This substance possesses a very acid and pungent, 
taste; it crystallizes with great difficulty, but is insoluble, in alcohol which precipi-i 
