35^ Dr. Pearson’s Experiments and Obfervations 
glazed, and it indicated 8i°. This loofely cohering folid 
being pulverized afforded a whiter powder than James’s 
P owder. 
(J) The crucible, with its charge (^), having a cover 
well luted on it, was again put into the furnace, and the 
fire raifed to almoft as great a degree as I ‘was able. This 
intenfe heat was kept up above an hour. After cooling, a 
white hard folid mats was found within the crucible. On 
breaking the veffel, to detach from it the charge, this folid 
mafs was found as hard as marble, and to have received its figure 
from the crucible. Its furface was covered with a yellow vi- 
treous coat, and the whole infide of the veffel had a beautiful 
gold-coloured glaze with many argentine Jpicula . The pyro- 
meter piece in the middle of the charge was alfo covered with 
a fine yellow glaze, and indicated 166 0 . This folid, hard mafs 
weighed only 21 grains lefs than before the experiment, though 
the whole infide of the crucible was glazed, and had Alining 
Jpicula upon it. A piece of this hard mafs being pulverized, it 
afforded a whiter powder than James’s powder is in general. 
exp. vi. zooo grains of coarfely powdered antimony, mixed 
with 1105 grains of calcined hart’s horn in powder, were 
calcined firft in an open veffel, and thenexpofed to a great degree 
of fire in a clofe veffel, as in the above experiments with bone* 
fhavings, Exp. 3. and 4. The calcination of this mix- 
ture in the open veffel afforded 2550 * grains, of a lefs whitifh 
and rather yellowifh powder, inftead of a light afh-colour, as with 
bone fhavings, Exp. 3. p. 353.; and by the fecond, and even 
* In another experiment of this kind 2400 grains of antimony and 1500 
grains of calcined bone afforded 3450 grains of yellowifh light-brown powder. 
In a third trial, 600 grains of antimony and 4QO grains of calcined bone gave 
850 grains of yellowifh brown powder. 
repeated 
