324 Dr. Pearson’s Experiments and Obfervations 
two hours. The decanted and filtered liquid on cooling grew 
lefs turbid than before, p. 320. and depofited lefs fediment. 
The filter, on drying, was found to have gained ten grains, 
though very little powder could be feen upon it. The 
experiments above related, were made on this filtered 
liquor, and in a (lighter degree the fame appearances were 
obferved. 
The James’s Powder remaining after thefe experiments, 
being well dried, weighed 260 grains, and therefore was found 
to have loft 40 grains, partly by folution in water, but ftill 
more by its adhering to the filters. 
I wifhed to know the proportion in which James’s Powder 
diffolved in water ; and therefore evaporated, in a very thin 
light glafs pan, previoufly weighed, twenty-four ounces of 
the filtered liquids, p. 320. and p. 324. Very little precipita- 
ted matter appeared till nearly the whole of the liquor was 
evaporated ; and, when the whole was carried off, a taftelefs 
whitifh, leafy, or mica-like fediment, but in fome parts black, 
was left, that weighed fix grains. This fediment required 
.above 100 times its weight of hot water to diflolve it. It was 
boiled in 500 times its weight of diftilled water, and it palled 
through feveral folds of filtering paper rather turbid even while 
hot; nor could it be rendered clear by repeated filtration 
through paper. This filtered liquid, 
(/>') With infufion of turnfole and turmeric, betrayed no 
alkaline fubftance, nor decifively any acidity. 
(b) Lime-Water rendered it curdy ; and on adding vinegar, 
it grew milky. 
(c) With acid of fugar it grew clear; but, on (landing, 
was more turbid than before, 
(</) Salited 
