594 DR E. A, LETTS ON THE 
In all three experiments the phenomena observed were much the same. 
The thetine salt fused and frothed at a temperature a little above 100° C., and 
the frothing continued to about 170° C.. A volatile liquid passed over, which 
partially solidified in the receiver (after standing some hours) ; at the same time 
some permanently gaseous products were formed, for at the end of the experi- 
ment the mercury stood at about 30 inches, and after some hours had dimin- 
ished only to about 15 inches. No doubt part of these gaseous products 
consisted of hydrobromic acid, as the corks used for connecting the different 
parts of the apparatus were charred, and acid clouds were formed when the 
apparatus was disconnected. In one of the experiments in which 50 grms. of 
the hydrobromate had been taken, there remained 20 grms. of residue, and 
thus 30 grms. of volatile products had been given off. 
The partly solidified volatile products were distilled from a water-bath, under 
pressure. 
A few cubic centimetres of a colourless liquid passed over, which smelt 
more like bromide than sulphide of methyl. During the distillation the 
pressure rose to nearly 30 inches. 
The solid crystalline residue which remained, fumed, and the corks con- 
nected with the apparatus in which it was heated were much charred. It was 
extracted with dry ether several times, then dissolved in boiling alcohol, and 
the solution filtered. On cooling, colourless plates separated, which were 
washed with cold alcohol, dried in a desiccator, and analysed— 
‘4665 grms. gave ‘059 bromide of silver = ‘238 bromine = 51:0 per cent. 
3560 a ‘438 : = “Sia 009 ae 
Calculated for (CH,),SBr ‘ ’ é : ; , =. 509 Jaa 
The identity of the substance with the bromide of trimethyl-sulphine was | 
further proved by its properties. | 
The non-volatile products when first formed were dark-coloured and 
syrupy, but after standing for some hours they solidified to a buttery, crystal- 
line mass. They had an acid taste, dissolved with great ease in water, 
effervesced with carbonates, and yielded insoluble precipitates with solutions of 
lead and silver salts. 
They were extracted seven or eight times with warm and perfectly dry 
ether (the ether was boiled with them each time, well agitated, and poured | 
off). After each extraction they seemed to grow more pasty and solid. The 
residue I shall call for convenience A. The ethereal solution deposited small 
crystals as it cooled,—apparently rhombohedra. The cold ether was poured 
away from these, and partly distilled off, when another crop of crystals 
separated.. The mother liquor was again poured off, and this time distilled 
to dryness, when it left a crystalline crust, impregnated with an oily substance 

