PHYSICAL anv LITERARY. 18% 
AN ounce of maguefia was expofed in a 
crucible for about an hour to fuch a heat 
as is fufficient to melt copper. When ta- 
ken out, it weighed three drams and one 
Eels. or had loft 7; of its former weight. 
I repeated, with “#8 magicfia prepared 
in this manner, moft of thofe experiments 
I had already made upon it before calci- 
nation, and the refult was as follows. 
Ir diffolves i in all the acids, and with 
thefe compofes falts exactly fimilar t to thofe 
defcribed in the firft fet of experiments: 
But what is particularly to. be remarked, 
it is diffolved without ay the leatt degree 
of effervefcence. 
Ir flowly precipitates the corrofive fub- 
limate of mercury in the form of a black 
powder, 
- It feparates the volatile alkali in falt 
ammoniac from the acid, when it is mixed 
with a warm folution of that falt. But it 
does not feparate an acid from a calcari- 
ous earth, nor does it induce the leaft 
change upon lime-water. | : 
LasT iy, when a dram of it is digefted 
. eth 2 an ounce of water in a bottle for 
fome 
