400 sdosicens of the Asiatic Society of Bengal. {[November, 1912.] 
tral cyedite sulphate. Pyridine sulphate was for this ‘purpose 
strong sulphuric acid of sp. gr ; eee the mix- 
ture on a waterbath and leaving in a desiccator over night 
when it solidifies en masse. A flocculent enctpitats appeared 
on the addition of barium chloride solution to pyridine sulphate 
solution in the above manner, which was allowed to settle till 
the supernatant liquid was clear. The liquid was decanted off 
and the residue was washed with cold water and finally dried 
in a desiccator. The dry substance is of a fine granulated 
structure. It is very deliquescent like the parent substance 
pyridine sulphate. When treated with water it rapidly dissoci- 
ates into barium sulphate and pyridine sulphate. On analysis 
it — slg to have the composition (C,H.N),H.SO,, 2BaSQ,. 
grms. gave 0'0926 gorms. of BaSO, - -p.c. of BaSO, 
63° 86 Cale. for (C.H.N) H SO,, 2BaSO, p.c. of ‘BaSO, 64°54. 
2. Quinoline Barium Sulphate. 
(C,H,N),H,SO,.2BaSQ,. 
This compound has been prepared by asimilar method. It 
is deliquescent, but less so than the former one. Results of 
ana yee are given below: 
0-0256 grms. gave 00144 rms. of BaSO,, —p.c. By tigen: 25 
Cale. ie (C,H,N) H,SO,, 2BaSO, p.c. of BaSO.5 
3. Piperazine Barium Sulphate. 
C,H,,N, H,SO,5BaSO,. 
It has been found that the precipitate is of a more definite 
eeenne structure, if the base remains in excess in the solu- 
tion. This compound i is the first of the cyclic imido siiatonts 
of the series. The formula of the compound as is shown, is 
different from the previous ones. It is not so deliquescent as 
the other two mentioned above. On analysis, the substance 
seh ei 
60 grms., 0-0480 grms. of BaSO ,—p.c. of ta 85°91 
Cale. fr C,H,.N, H. oe Lene a c. of BaSO, 86 
re a ed i 
of the series by the se motlid of double vet orgs 
We have found Lene that similar double sulphates wit 
e avail ourselves of this opportunity of expressing our — 
thanks to Professor P. C. Ray for the interest he has taken in 
this veiicnGon, 
CHEMiIcAL LaporaTory, 
Presidency College, November 1912. 
