of Sea Water , &c. 51 
magnefian fait, mixed with it. It is probable, 
that the marine felenite may be lefs feptic, and 
lefs foluble in water, fo as to feparate, during 
the evaporation of the brine. If fo, the addition 
of quicklime may be ufeful, previous to that 
procefs at the fait works. But we are fo little 
acquainted with the properties of calcareous falts, 
that, at prefent, we cannot determine whac 
might be the effeds of fuch a practice. I propofe, 
however, at lome future opportunity, to try, 
whether the calcareous marine fait will thus fepa¬ 
rate; and whether it be, in itfelf, feptic, or 
antifeptic. 
Dr. Haygarth, of Chefter, who is not more 
diftinguifhed for his extenfive knowledge, than 
for his friendly and benevolent difpontion, has 
lately,in the moftobliging manner,communicated 
to me, a description of an apparatus, which he 
has invented to mix air with liquids. The 
Dottor apprehended, that this method might 
facilitate my defign of precipitating the lime 
from water, to which it might have been added 
on fhip board ; and, with his ufual candour, and 
generofity, delivered up his invention to my 
fervice. The plan is truly ingenious, but I fear, 
and all my friends, whom I have confulted, agree 
with me in the apprehenfion, that the machine 
would be much too complex to admit of being 
E 2 ufed 
