cn the Competition of James’s Powder.' 3 i<j 
hering white folid, about three- fourths of the original weight 
of the powder, was left. If the flame was fuddenly with- 
drawn, as foon as the white fumes appeared, they afcended 
with a kind of revolving motion. 
(J?) Two grains of this powder, mixed with about three of 
pulverized tartar, being expofed on charcoal to flame applied 
by the blow-pipe, the mixture turned black, boiled, and fwelled ; 
and by continuing to apply the flame, the coaly matter of the 
tartar difappeared, a part of the mixture- filled, and in that 
{fate feveral fmall, filvery, apparently metallic grains were 
perceived. On cooling, they were feen with the naked eye, 
or with a lens, adhering to an irregularly figured, partially 
melted, whitifh mafs. On a fecond application of the flame, 
thefe metallic globules difappeared. 
(<r) James’s Powder, with glafs of phofphoric acid, melted 
into an opaque yeliowifh globule while hot, which on cooling 
grew whitifh. 
{ 'd ) This Powder, with feveral times its weight of melted 
borax, afforded a colourlefs tranfparent glafs while fluid; but, 
on adding a larger proportion of powder, the globule turned 
opaque, and when cold became of a milky whitenefs. As 
the James’s Powder mixed, or melted, with the fufed fait, flight 
explofions were feveral times heard. 
(<?) With foffil alkali, in the fpoon, this 5 " powder apparently 
fufed, and afforded a colourlefs tranfparent fluid in a ftate of 
rotatory motion ; but on cooling it grew opaque, and had a 
horny appearance. 
100 grains of this powder in a two- inch Englifh cru- 
cible, the cover of which was luted on it as clolely as poffible, 
were expofed above two hours to a fierce fire in a melting fur- 
nace. On breaking this crucible, when cold, the powder was 
r found 
