on the Composition of James’s Powder. ^y 
are Teen fnriall Jpicula. It appears to me to be nothing more than 
James’s Powder for Fevers, or Lile’s Powder above-men- 
tioned, made by calcining antimony and bone-afhes together in 
open veliels ; becaufe, ift, by expofore to a white heat in clofe 
veffels, it turns as white as James’s Powder. 2 dly, It dif- 
folves partially in nitrous acid ; and the remainder diflblves 
partially in marine acid. The nitrous folution contains 
phofphonc acid and calcareous earth; and the muriatic folu- 
tion affords Algaroth powder. 
From the whole of the above analytical experiments it appears : 
1. That James’s Powder confifts of phof^horic acid, lime, 
and antimonial calx ; with a minute quantity of calx of iron, 
which is considered to be an accidental lubfiance. 
That either, thefe three cflential ingredients are united 
with each other, forming a triple compound, or, phofphorated 
limo is combined with the antimonial calx, compofing a double 
compound in the proportion of about 5- parts of calx and 43 
parts of phofphorated lime. 
3. That this antimonial calx is different from any other 
known calx of antimony in leveral of its chemical qualities. 
About three-fourths of it are ioluble jn marine acid, and afford 
Algaroth powder ; and the remainder is not foluble in this 
menftruum, and is apparently vitrified. 
From the preceding fynthetic experiments it appeats, that by 
calcining together bone-afhes, that is, phofphorated lime, and 
antimony in a certain proportion, and afterwards expofing the 
mixture to a white heat, a compound was formed confiding of 
antimonial calx and pholphorated lime, in the fame proportion, 
and pofTefling the fame kind of chemical properties, as James’s 
Powder. 
