C ”7 ] 
This operation was often repeated, and always 
with fome little variation in the produds, owing to 
the management of the fire, which cannot be always 
made alike. 
If this preparation be made with too great a degree 
of fire, the Aurum mofaicum will be partly melted, 
or of a dark colour 5 and if the fire be not continued 
for a fufficient time, a portion of the cinnabar and 
fait of tin will remain with the Aurum mofaicum. 
^he Sublhnate of Aurum mofaicum examined. 
The fublimate, which was obtained in preparing 
the Aurum mofaicum weighing J 13 5 2 was finely 
powdered and digefted with diftilled water fharpened 
with fome acid of fait and when cold was filtered 3 
more water was added to what remained in the filter, 
by which means it was deprived of its foluble part. 
•f* The undiflblved part of the fublimate dried, 
and then fublimed in a retort, produced § 9I of cin- 
nabar, which was of a dark colour, owing to an excefs 
of fulphur; there came over into the receiver a fmall 
quantity of an acid liquor, and there was found in 
the retort 5 I of Aurum mofaicum, which added to 
the former quantity makes J i6|. 
The foluble part of the fublimate is compofed of 
tin united to the acid of fait ; in order to know 
the quantity of tin which it contains, a fufficient 
quantity of fixed alcali diflblved in water was added 
^ Salt of tin mixed with water becomes turbid, and a portion 
of the tin precipitates ; therefore the acid of fait was added, to pre- 
vent the precipitation. 
f This contains fome running mercury j but in the fublima- 
tion it difappears, and forms cinnabar. 
7 to 
