a> 
vations made in the time they paffed 
through fuch a place. But I mutt 
leave the difcuffion of this matter 
to my refpectable friend Abbé Fon- 
tana, who, in my opinion, has caft 
a great light upon this important 
fubject; and intends foon to pub- 
lifh his obfervations on this head, 
I will add only fome further reflec- 
tions upon the changeablenefs of 
air, its Proteus-like and pagina 
rical nature, 7 
Since the experiments. Of» ons 
Rev. Dr. Hales, we know that air 
enters the compofition of bodies, 
and even ferves as a kind of cement 
for the ftronger cohefion of the 
conftituent particles of a folid body; 
By this it feems that air may become 
itfelf a folid body, as it conftitutes 
fuch a confiderable part of fome 
~~ gad bodies, fuch as are, for 
inftance, 
