ACTION OF HEAT ON COMPOUNDS OF DIMETHYL-THETINE. 593 
And the formation of thiodiglycollic acid from the hydrobromate of dimethyl- 
thetine would be represented by the equation— 
CH, CH,—CO,H 
| | 
2 {Br—S—CH, = 8 4+ 2CH,Br + (CH,),S. 
| | 
CH,—CO,H CH,—CO,H 
The sulphide and part of the bromide of methyl} would unite to form 
bromide of trimethyl-sulphine. 
Before proceeding to examine the non-volatile products of the action of heat 
on hydrobromate of dimethyl-thetine, in order to ascertain the presence or 
absence of these acids, it was judged expedient to repeat the experiment with 
somewhat larger quantities, and in a somewhat different manner,—first, to have 
a sufficient quantity of material to examine; and next, to ascertain the nature of 
the gaseous or very volatile substances which caused the pressure observed in 




















































































Fig. 2. 
the experiment with the sealed tube. Three separate quantities of the hydro- 
bromate were heated in a strong reagent bottle connected with a Lrrsic’s con- 
denser, which, in its turn, was connected with a receiver placed in a freezing 
mixture, and the latter attached to a mercury manometer. Thus the volatile 
products of the decomposition would be subjected to a pressure of at least 30 
inches of mercury. (See sketch.) 
