584 DR E. A. LETTS ON THE 
then placed in a desiccator in order that the alcohol might evaporate. After 
some time magnificent colourless crystals separated from the solution, which 
are either oblique rhombic or quadratic prisms—which, could not be deter- 
mined by simple inspection. Several of them grew till they were fully a 
quarter of an inch in across, and could no doubt be grown to almost any size if 
allowed to remain for a sufficient length of time in the mother liquor. 
The crystals, there can be no doubt, consist of hydrobromate of diethyl- 
thetine, formed according to the equation— 
C,H, 
Br—CH,—COOH + (C,H,),S = Br—S—CH,—COOH. 
C,H, 
The analysis of the lead and platinum salts derived from it, as well as its 
analogies with the methyl compound, leave no doubt as to its composition, but 
owing to its extreme deliquescence no analysis has been made. 
Hydrobromate of diethyl-thetine, like the corresponding methyl compound, 
is readily stained brown by contact with filter paper. It is soluble in water 
and alcohol with ease, less so in sulphide of ethyl, but still considerably, and, 
as far as could be judged, insoluble in ether. Well-developed crystals could 
not be distinguished from the methyl compound. Both apparently ceystallise 
in the same form, but this point requires investigation. 
Ethyl-Thetine Lead Salt.—A quantity of the hydrobromate was dissolved in 
water, and carbonate of lead added. LEffervescence occurred immediately, and 
on boiling the mixture, the carbonate of lead gradually dissolved. When this 
no longer occurred, the solution was filtered, and as it cooled deposited very 
beautiful tufts of small crystals, which consist either of needles or of narrow 
plates. This salt is very sparingly soluble in cold water, but comparatively 
easily soluble in boiling water. Its analysis gave the following numbers :— 
Obtained. Calculated for 
er eee C,H,,80,, 2PbBr,. 
Carbone |g sa aaeun ae 3s aes 8:16 
Hydrogen, . : : 16 ae 1°36 
Bromine, . : : 35°6 350 36°28 
Lead, . $ ; : 46°6 46:3 46°94 
It is analogous in composition and properties to the corresponding methyl 
compound, and may be formulated thus— 
OH 3 pe —CO,PbBr, PDBr, ; 
C,H if > Br 

