/ 
On the Constitution of mixed Gases, 3c. 549 
be aériform, then a diminution of bulk, an in. 
crease of temperature and of specific gravity may | 
be expected—Several facts in chemistry accord _ 
with this hypothesis-When muriatic acid gas 
and ammoniacal gas are mixed together in due 
Proportion, a solid substance, muriate of am- 
monia, is formed, ant the gases wholly disap- 
pear. When ammoniacal gas and aqueous 
vapour are mixed, the two unite and a portion 
of the compound becomes liquid. When nitrous 
Bas and oxygenous gas are mixed in due propor- 
tion, the two unite and form a new elastic com. 
pound of greater specific gravity and conses 
quently of less bulk, nitric acid gas.—But there 
are other cases of mixtures of elastic fluids, some 
of which have been mentioned, where no signs 
of chemical affinity are discoverable ; in regard 
to such this hypothesis fails equally with the 
other two, We must therefore have recourse to 
another. 
(4. The particles of one elastic fluid may Possess 
no repulsive or attractive power, or be perfectly in- 
elastic with regard to the particles of another: and 
consequently the mutual action of the fluids be subject 
to the laws of inelastic bodies, 
According to this hypothesis if m measures 
of A be mixed with » measures of B, the two 
VOL, V, FF 
