385 
of Edinburgh, Session 1873-74. 
Nitrate of dimethyl-thetine , prepared by treating the hydro- 
bromate with nitrate of silver, is a transparent crystalline sub- 
stance. 
The formula 
C 4 H 9 (N0 3 )S0 2 = 
(CH 3 ) 2 
N 0 3 — S— CH a — COOH 
was verified by an organic analysis — 
Calculated. 
C 26‘2 
H 4-9 
Obtained. 
26-4 
4*9 
Double Salt of dimetliyl-tlietine and bromide of lead. — A boil- 
ing solution of hydrobromate of dimethyl-thetine dissolves car- 
bonate of lead with evolution of carbonic acid, and on cooling 
deposits beautiful silvery scales. 
The formula of this body is 
C 4 H 8 S0 2 , 2PbBr 2 
Calculated. Obtained. 
0 
... 5-6 
5-7 ... 
... 5-7 
H ... 
... *9 
•9 ... 
... -9 
Br ... 
... 37-0 
37-0 ... 
... 37 *5 
Pb ... 
... 48-4 
48-4 ... 
... 48*5 
. In addition to these compounds, a very beautiful salt was 
obtained by the action of hydriodic acid on the base, or by double 
decomposition between iodide of barium and sulphate of dimethyl- 
thetine. In appearance it resembles permanganate of potash, and is 
a poly-iodide; but its examination is not as yet completed. 
Hydrobromate of diethyl-thetine was prepared in a similar manner 
to the corresponding dimethyl compound, which it resembles ; 
it is so deliquescent, however, as to render its analysis almost 
impossible. It gives beautiful orange-coloured salts with bichloride 
of platinum. 
