[ I2I ] 
Aurum mofaicum melts much more readily than 
fulphurated tin ; and that, becaufe it contains a greater 
quantity of fulphur. 
Sulphurated tini by calcination, Is totally deprived 
of its fulphur and phlogiflon. ^ 4 of tin faturated 
with fulphur, and then carefully calcined weighed 
5 4l, fo that a calx of tin prepared in this manner, 
weighs -1 more than the tin it contains*. 
Four ounces of Aurum mofaicum calcined in the 
fame manner, weighed § 3, 5 2, 9 i, which, being 
a calx of tin, of the nature of that made with ful- 
phurated tin, contains ^ lefs of tin, which 4 being 
deduded, makes 5 2, 5 7, 9 i, gr. 4I, the quantity 
of tin contained in ^ 4 of Aurum mofaicum ■f'. An 
ounce of Aurum mofaicum carefully calcined, and 
reduced with flux, produced only | f and gr. r i of 
tin: we may conclude from the foregoing experi- 
ments, that ^ I of Aurum mofaicum contains more 
than this quantity of tin j but it is well known that 
metallick bodies, which have been much calcined, 
and efpedally tin and zinc, always lofe in their 
redudion. 
Aurum mofaicum will be of a black colour, if 
too fmall a quantity of fulphur be ufed, and if the 
fire be too ftrong and too long continued *f*. 
* All metallick fubftances, and even zinc, though a good deal 
of it diffipates in flowers, increafe in weight by calcination, 
t It is almoft impoflible to calcine Aurum mofaicum, with- 
out fome lofs i for it is fo light and fubtil, that it cannot be 
flirred without diilipating fome of it ; therefore the quantity of 
tin which it contains, cannot be exadlly afeertained by this 
means. 
VoL. LXL 
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Receipts 
