PHYSICAL anno LITERARY. 243 
found that it was joined to the calcarious 
earth at the fame time that the acid was 
joined to the earth of magnefia; and ima- 
gined that a pure calcarious earth might 
poffibly have a ftronger attraction for a- 
cids than pure earth of magne/ia. 
I therefore diffolved two drams of mag- 
nefia in the marine acid, and thus obtain- 
ed a compound of an acid and of the 
pure earth of this fubftance; for the air 
which was at firft attached to it, was ex- 
pelled during the diffolution., 1 then ad- 
_ ded thirty grains of ftrong quick-lime in 
exceeding fine powder, fhook the mixture 
well, and filtrated it. The powder re- 
maining in the paper, after being well 
wafhed, was found to be a. magnejia, 
which, as I expected, was deftitute of air; 
for it was diffolved by the vitriolic acid 
without effervefcence; And the filtrated 
liquor contained the lime united to the a- 
cid; for, upon dropping {pirit of vitriol 
into it, a white powder was immediately 
formed. . 
WeE muft therefore acknowledge a 
_ ftronger attraction between the calcarious 
earths 
