340 Dr. Pearson's Experiments and Obfervations 
affufions, which afforded 57,15 grains, p. 338., and fuppofing 
the calx to be neither increafed nor diminifhed in weight by 
the acids, the real quantity of foluble and fufible calx of anti- 
mony may be ftated to be that of Algaroth powder ; for 
the other kind of antimonial calx obtained by fubfequent affu- 
fions was probably only fufpended. Confequently 240 grains, 
of James’s Powder afforded, by the above experiments with 
marine acid, 57,15 grains of Algaroth powder, and 19,85 
grains of a lefs foluble and more difficultly fufible calx of anti- 
mony, with a fmall proportion of phofphorated lime. The 
refiduum, amounting to 55 grains, was of courfe next exar 
mined. 
* Experiments upon the part of James’s Powder which was 
wfoluble in the above menfrua. 
(a) A few grains of this in foluble fubftance could neither 
be melted nor carried off in vapour by means of the flame of a. 
candle applied to it upon charcoal, and alfo in the fpoon, with 
the blow-pipe ; but, • 
(b) Mixed with an equal weight of tartar, it melted on 
charcoal; and, while in fufion, fmall, apparently, metallic 
grains were diftindtly perceived; and on cooling they could be 
feen, even without a lens, adhering to an irregularly figured, 
opaque, whitiffi mafs. Sometimes flight explofions were 
heard while the flame was applied. The metallic grains ap- 
peared more diftindtly when this powder was mixed with one- 
third of its weight of powdered calcined bone, than in James’s 
Powder. 
(c) Ten grains of this powder were melted as above men- 
tioned, by repeatedly applying flame with the blow-pipe to 
two 
