346 Dr. Pearson’s Experiments and Observations 
pofleffing all the lame properties as James’s Powder, by 
milting or mixing together the fubftances fhewn by the above 
analyfis to enter into its compofition, would afford all the 
proof and demonftration which can be had in the fcience of 
chemiftry. 
The above analyfis fhevved no eflential ingredients of 
James’s Powder but antimonial calces, phofphoric acid, and 
calcareous earth, which two laft fubftances appeared to be 
united together ; but it would have been vain and unnecefFary 
labour to have attempted to make this powder by mixtures of 
any of the commonly known calces of antimony and phof- 
phorated lime ; becaufe none of them, from their well known 
qualities, could forto a powder of the lame colour and fpecific 
gravity as James’s Powder, and like it partially foluble in 
acids. From the above experiments, however, the proba- 
bility was evident, that this fubftance might be made by cal- 
, cining together antimony and bone-afties; which operation 
produces a powder called Lile’s and Schawanberg’s fever- 
powder; a preparation defcribed by Schroder and other chemifts 
1 50 years ago. The receipts for this preparation differed in the 
proportion of the antimony to the bone afhes, and in the ftate 
of the bone ; fome directing bone fhavings to be previoufly 
boiled in water; others ordered them to be burnt to afhes be- 
fore calcining them with antimony ; and in other preferiptions 
the bone fhavings were directed to be burnt with the antimony. 
According to the receipt in the poffeflion of Mr. Bromfield, 
by which this powder was prepared forty-five years ago, and 
before any medicine was known by the name of James’s 
Povyder, two pounds of hart’s horn fhavings muft be boiled 
to diflolve all the mucilage, and then, being dried, be cal- 
ckied with one pound of crude antimony, till the fmell of 
fulphur 
