158 
Proceedings of Royal Society of Edinburgh. [sess. 
Percentage of barium in COO \ 
I \ 
CH \ 
|| >Ba = 44-0. 
csc 2 h 6 / 
1 ~ / 
coo / 
The barium salt was then converted into the acid by adding the 
calculated quantity of sulphuric acid. On evaporating the filtrate 
from the barium sulphate, the acid was obtained as a white solid, 
easily soluble in water, alcohol, and ether ; but insoluble in ligroin 
and chloroform. The only insoluble salt was the lead salt. The 
acid gave on analysis the following numbers : — 
"Weight of substance taken =‘0996 gram. 
Weight of carbonic acid obtained = *1498 gram. 
Weight of water obtained = ’0413 gram. 
Calculated for COOH Pound. 
CH 
II 
C = 409 
csc 2 h 5 
C = 40-9 
H = 4-5 
COOH 
H = 4*6 
III. Action of Sodium Dibromosuccinate on Sodium Ethyl- 
SULPHINATE. 
An aqueous solution of sodium ethylsulphinate was mixed with 
dibromosuccinic acid, which was nearly neutralised with sodium 
carbonate, and the mixture was heated for 8 hours at 140°. On 
cooling, long needles appeared in the tube. When opened, a 
violent escape of gas took place. The needles were placed on a 
filter, washed with water, and recrystallised from chloroform. 
The substance gave on analysis the following numbers : — 
Weight of substance taken = 1631 gram. 
Weight of carbonic acid obtained = ’1941 gram. 
Weight of water obtained = *1015 gram. 
Calculated for C 6 H 14 S 2 0 4 . Pound. 
C = 33*6. C = 32*5. 
H = 6-5. H = 6-9. 
