on the Compojition of James’s Powder . 335 
fides a little cubic nitre, vitriolated foffil alkali and iron, 
with fome veftiges of calx of antimony, and phofphorated 
lime. 
The precipitate thrown down on adding vitriolic acid, and 
left upon the filter, weighed when dried 26,1 grains, and was 
vitriolated lime, with a minute portion of calcined antimony 
and iron. 
The 6,5 grains, p. 330. left on evaporation to drynefs of the 
fecond folution in nitrous acid, confifted of nearly three grains 
of calcined antimony, and the reft phofphorated lime, with a 
little iron. 
1. It appears from the above experiments with nitrous acid, 
that this menftruum, by two affufions, in a large proportion, 
aided by trituration, digeftion, and heat, diffolved 4^4- °f 
James’s Powder that had been expofed to the a&ion of water 
and acetous acid ; but from the fmallnefs of the quantity con- 
tained in the nitrous acid the fecond time it was applied, and 
from its being ptincipally calcined antimony, not more than 
two of the fix grains afforded by this folution, perhaps, fhould 
be confidered to be dij/olved 9 for the reft may be fuppofed to be 
merely fufpended. 
The firft folution alfo in this menftruum was not filtered, 
and the acid was confiderably redundant, and there was found 
in it feveral grains of calcined antimony. The real quantity 
dffolved might therefore probably be eight grains lefs than 
the above 308 ftated. According to this mode of calculation, 
the proportion of the foluble part of James’s Powder in 
nitrous acid is 4.^, or about ^ 4 0 -~. 
2. The whole of this foluble part, except a little calx of 
antimony, is, decifively, phofphoric acid and calcareous earth t 
which 
