84 W. P. Dexter on the Sulphates of Antimony. 
oxyd of antimony, obtained a salt “in the form of small, 
brilliant crystals,” of which he has given the analyses: he 
Sbo, 63:0 . 64:3 
SO, 371 350 | 
and which therefore seem to have been the salt just described 
In fact, hydrated sulphuric acid, gently warmed, unites with 
the oxyd to form this compound, which is then dissolved ata 
higher temperature, with production of the neutral salt. 
In the formation of both the octahedral and prismatic crys 
tals, there appears to be direct conversion of the undissolvel 
oxyd into the salts : they are also deposited from a solution df 
the oxyd in sulphuric acid of the proper concentration. Ther 
is, however, a peculiarity attending their formation, When they 
quantity: the separated basic salt redissolves at last-complete] 
in the acid. By arresting the evaporation at the proper pe od 
as has been said, octahedral crystals may be deposited from the 
liquid on cooling, but no conversion of the basic salt into thet 
seems to take age By decomposing the basic salt wl» 
carbonate of soda, and treating the resulting oxyd with Jute 
acid, the octahedral crystals can be again produced. 
in flat prisms ree from the octahedral crystals by concentt®- 
tion of the acid liquid in an open vessel, experiments Wel 
made with acid of various degrees of dilution. An acid o 
sp. Bt on than 16, gave, by boiling with the oxyd, oct 
of needles. So that the production of the body in ques jon 8 
ec te — Pai Raph of ‘cabinteation of the a 
e salt was dried, like the bisulphat te surroun 
wih hot @ae e bisulphate, upon a plate sur 
Of two different preparations 
0-624 salt gave 0°4864 SbS, and 0:571 Bad : (J) 
0524 “ * 04097 SbS, and 0-479 BS: 2) 
