384 
Proceedings of the Royal Society 
dimethyl-thetine and chloride of barium. It is a crystalline sub- 
stance of strong acid reaction. 
The formula 
(CH 3 ) 2 
C 4 H 9 C1S0 2 = II 
01— S— CH— COOH 
was verified by a chlorine determination. 
Calc ulated in 100. Obtained. 
"~cT 22*7 23-4 
Chloroplatinate of dimetliyl-thetine is obtained in beautiful light 
orange-coloured crystals when solutions of the bydrocblorate and 
chloride of platinum are mixed. This salt contains two molecules 
of water of crystallisation, and has the formula 
2(C 4 H 9 ClS0 a ),PtCl 4 ,2H JJ 0. 
The salt was analysed by determination of water and platinum — 
Calculated in 100. Obtained in 100. 
Pt = 28-6 ' '28-5 28-r 
H 2 0 = 5-2 5-4 — 
Bromaurate of dimethyl-thetine was obtained by mixing alcoholic 
solutions of hydrobromate of methyl-thetine and bromide of gold. 
The analysis shows too small a quantity of gold for the normal 
bromaurate, but agrees with the amount required for a salt crystal- 
lising with three molecules of alcohol. This compound has not been 
more particularly examined. 
Sulphate of dimethyl-thetine was prepared by the action of sul- 
phate of silver on hydrobromate of dimethyl-thetine. It can be 
obtained in large crystals, which are not deliquescent. It was 
analysed by a sulphuric acid determination. 
(CH a ) 2 
.S— CH— COOH 
S0 4 <^ requires 28 4 per cent. SO, 
X S — CH 2 — COOH 
II 
(CH 3 ) 2 
whereas 28 - 2 per cent, and 28’0 per cent, were obtained by experi- 
ment. 
