Dr. P^arson^s Experiments and Olfervations 
which two fubftances may reafonably be fuppofed, from thefe 
experiments, to have been united together, and to have been 
in the (late of phoiphorated lime in this powder. Confe- 
quently, the proportion of this phofphorated lime, conlidered 
as the foluble part of James’s powder in thefe experiments 
with nitrous acid, appears to be 40 per cent, making a deduction 
of 1 per cent, for the antimonial calx contained in the 
nitrous acid in the above experiments. It is however already 
obvious to fufpedl, that the powder which refilled folution in 
this menftruum may contain more phofphorated lime ; and 
this confideration prevents me affigning at prefent the above 40 
per cent, as the whole quantity of it in James’s Powder. It 
cannot however, I think, be a fmaller proportion. 
I do not reckon the calx of iron in thefe calculations, be* 
caufe it is in too fmall a quantity, and is apparently only to 
to be looked upon as an accidental extraneous fubftance. I 
iuppofe too, that the water and acetous acid applied to the 
James’s Powder ufed in thefe experiments, carried off a propor- 
tion of its ingredients equal to that in the remaining powder. 
IV. With marine acid. 
The S32 grains of heavy, white, taftelefs powder, the 
refiduum after boiling 240 grains of James’s Powder 
in nitrous acid, till it had diffoived that part for which 
it has any confiderable affinity, p. 330. were digelied for 
twenty-four hours in eight ounce-meafures of marine acid, 
the fpecific gravity of which was 1,170, and diluted with half 
its bulk of diftilled water. This mixture was diftilled in a 
7 gentle 
