350 Dr. Pearson’s Experiments and Obfervations 
as could be expected from the nature of the fubftances and the 
experiments, in the fame proportion as thofe in James’s Powder. 
The Algaroth powder, obtained by means of folution of the 
Pulvis antimonialis in marine acid, was in the fame proportion 
as nearly as could reafonably be expected from the nature of 
the experiments as that obtained from James’s Powder. And 
the part that refitted folution in this menftruum was partially 
reducible to a metallic form, and had otherwife the fame pro- 
perties, as far as difeovered, as the infoluble part of James’s 
Powder. 
Having now formed a powder poffefled of properties fimilar in 
hind to every one of thofe afeertained in James’s Powder, with 
fcarcely any difference in the degree of them, if it be thought that 
among thefe properties are thofe which are effential and pecu- 
liar ones of James’s Pcwder, the conclufion that thefe two 
are the fame kind of things mutt be admitted to be juft. The 
nature of one of the ingredients of James’s Powder, viz. the 
irreducible part of the infoluble matter, p. 342. is not fully 
elucidated by the fynthetic experiments; but in fo far as they 
fhew, that this part equally exitts in the powder formed by 
calcining together antimony and bone, which is concluded to 
be James’s Powder, the objedlion againft the conclufion with 
refpeft to the identity of the two fubftances, on the ground of 
this inconfiderahle part of James’s Powder not being well 
nnderttood, mutt be of little weight. 
Several reafons, more interefting to myfelf than to the Society, 
induced me to authenticate by additional teftimonies thofe ana- 
lytic experiments, which may be confidered to be more decifive 
than the reft for eftabliftiing the identity of James’s Powder, and 
a powder formed by calcining together antimony and bone- allies. 
1 therefore requefted Mr. Cavallq and Mr. Turner to be 
7 prefent 
