468 MR. G. B. BUCKTON AND DR. A. W. HOFMANN’S RESEARCHES ON THE 
From the extreme solubility of these salts, great difficulty was experienced in sepa- 
rating them completely one from the other. The method adopted was that of partial 
precipitation by alcohol. To solutions moderately concentrated and cold, sufficient 
absolute alcohol was added to produce a cloud, permanent when rapidly stirred. On 
allowing the liquid to stand for an hour, a quantity of a granular substance attached 
itself to the glass vessel, which, after solution in water and reprecipitation, was dried 
and decomposed by sulphuric acid. 
0*2336 grm. at 160° gave 0*1800 grm. of sulphate of barium, 
which corresponds to the formula for sulphobutyrate of barium, 
C0 Hg BUa S2 OiQ. 
The percentage required is — 
Theory. Found. 
8 equivs. of Carbon . . 
r~ 
. 48 
15*84 

6 equivs. of Hydrogen . 
6 
T98 
2 equivs. of Barium . . 
. 137 
45*21 
45-29 
2 equivs. of Sulphur . . 
32 
10*56 
10 equivs. of Oxygen . . 
. 80 
26*41 
303 
100-00 
We have not been able to procure the disulphopropiolate of barium in a state of 
purity. The alcoholic liquid which remains after deposition of the sulphobutyrate 
contains a considerable quantity of the salt, but so mixed, that we were unable more 
than proximately to isolate it. By continuing the process of fractional precipitation, 
and drying, and by analysing the different samples, the quantity of barium present in 
the successive specimens was found to decrease. In three consecutive analyses we 
arrived at the following percentages *. — 
43-4, 
42-9, 
41*7. 
The formula 
Cg 
(Hg Baa) S 4 O 12 
requires the following values : 
Theory, 
A 
Found. 
6 equivs. of Carbon . . 
. ' 36 
10-61 
6 equivs. of Hydrogen . 
6 
177 
2 equivs. of Barium . . 
. 137 
40-41 
41*7 
4 equivs. of Sulphur . . 
64 
18*87 
12 equivs. of Oxygen . . 
. 96 
28*34 
339 
100*00 
This salt is not so wholly uncrystallizable as 
the sulphobutyrate. 
By slov/ evapora 
tion it furnishes very minute crystals, which under the microscope show themselves 
as thin pearly plates. They appear best when slowly thrown down by alcohol from 
the solution. 
