on the Compojition of James’s Powder. 327 
This mixture of acetous acid and powder being poured, 
while hot, on a filter of two folds of paper, a clear and co- 
Icurlefs liquid paffed through, that remained fo, when cold, 
without any fediment. The filter, with the powder upon it, 
being well dried, weighed ten grains more than the fum of 
their weight feparately before the experiment ; but the powder 
being carefully fc raped off weighed only a little more than 240 
grains, and appeared to have iuffered no change in its pro- 
perties. 
This filtered liquor was fubjeffed to diftillation ; it remained 
clear till about half of it had come over : but then it became 
rather turbid, and grew more fo to the end of the diftillation- 
There remained in the retort apparently four or five grains of 
brown fediment, that adhered very clofely to the bottom and 
Aides of it, nearly half as high as the liquid reached. 
iff, This acetous acid, in which James’s Powder had 
been boiled, and afterwards diftilled, was found to contain 
no earth, fait, or metallic matter ; nor did the acid itfelf 
appear to be altered in its chemical qualities- 
2dly, The refiduum in the retort had no tafte. It did not 
appear to difl’olve by trituration in one ounce of diftilled water,, 
nor in lixivium of alkali of tartar, mild or cauftic. After 
boiling this refiduum in one and a half ounce of water, part 
of it feemed to be diffolved ; and this folution being filtered 
was examined with the following re-agents. 
(^) Acid of fugar rendered it turbid, and transparency did 
not enfue on adding a further quantity of this acid. 
(by Muriated barytes produced a confiderable turbidnefs* 
which was not removed by adding concentrated acetous acid. 
(r) Nitrated filver induced a flight turbid appearance. 
(dy Mild alkalies induced no vifible change. 
(f) Pruffianated 
