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COMPOUNDS OF ETHYL-, PROPYL-, BUTYL , AND AMYL-THETINES. 589 
dissolved on boiling the mixture, and separated on cooling, in beautiful silvery 
plates (A) resembling the propyl-thetine lead salt. 
The liquor (1) was again saturated with hydrate of lead, and yielded 
another crop of similar crystals. These were recrystallised (B). The mother 
liquors from both it and (A) were concentrated, and yielded another crop of 
crystals (C). Determinations of lead in these three salts gave the following 
numbers :— . 
Lead in 100. 
(oar coagey een ey ee 
(B\ te dans fuila On nea’ 
(OVS Cee aM ie Uae Airey 
which compare thus, with those calculated for bromide of lead and com- 
pounds of it with hydrobromate of di-isobutyl-thetine— 
Lead in 100. 
PbBr, requires . : 3 ? 56:2 
(C,)H,,SO,), 5PbBr, , F 4 50°7 
(Cue SOs aepBr. Va) ee 47-6 
From which it appears probable that (A) consists, if not entirely, at least for 
the greater part, of bromide of lead, and (B) and (C) of compounds of a mole- 
cule of di-isobutyl-thetine, with 5 and 3 molecules respectively of bromide of 
lead. 
The solution of the hydrobromate of di-isobutyl-thetine was readily acted on 
by sulphate of silver, but the resulting sulphate could not be obtained in the 
crystalline condition, as was also the case with the hydrochlorate obtained from 
the sulphate by treating it with chloride of barium. 

Hydrobromate of Diamyl-Thetine—The phenomena attending the action of 
sulphide of amyl on bromacetic acid are exactly similar to those observed with 
the isobutyl sulphide, only the formation of an oily layer takes place very slowly 
and even more of the sulphide remains unacted on. No crystalline compounds 
could be obtained—with the exception of lead salts which were not specially 
examined. The hydrobromate and the other salts of diamyl-thetine consist 
apparently of uncrystallisable syrups. 

