582 PROF. CRUM BROWN AND DR E. A. LETTS ON DIMETHYL-THETINE, ETC. 
The formula— 
CH,, » CH. 
| | 
(C,H,SO,),80, = HOOC—H,C—S—s0,—S—CH,—COOH 
CH, H, 
was verified by a determination of sulphuric acid— 
Obtained in 100. Calculated. 
iin 
SOM -pe ue a ee ee 28-4 
Nitrate of Dimethyl-Thetine.—This salt was prepared by the action of 
nitrate of silver on hydrobromate of dimethyl-thetine. A weighed quantity of 
the latter was dissolved in water, and a solution containing the equivalent 
quantity of nitrate of silver added. The mixture was then filtered from the 
precipitated bromide of silver, and concentrated in vacuo over sulphuric acid. 
The nitrate separated in large colourless crystals when the solution was of 
small volume. It has a sour taste, and its solution reddens litmus. It is 
readily decomposed even when heated at 100° C., and its aqueous solution 
when boiled also suffers decomposition, red fumes being given off. 
The formula— 
CH, 
| 
C,H,SO,NO, = NO,—S—CH,—COOH 
CH, 
was verified by a determination of carbon and hydrogen— 
Calculated in 100. Obtained. 
Carbon, : ‘ ; 26:2 26°4 
Hydrogen, , , . 4:9 4:9 

