542 Onthe Constitution of mixed Gases, €9c. 
cific gravities ; this hypothesis is inconsistent with 
‘the phenomena. 
2. Particles of one elastic fluid may repel those 
of another with forces greater or less than what is 
exert upon ky own kind. 
Here again m measures of A, with 2 measures 
of B would occupy m+n measures, and the pres- 
sure on each particle of the mixture be the same, 
and equal to 30 inches of mercury. But the - 
fluids in this case could not remain mixed or 
diffused intimately through each other; that fluid 
of the greatest specific gravity must take the 
lowest place.—This therefore is equally incon- 
sistent with the known phenomena, and must. be 
rejected also, 
3. The particles of one elastic. fluid may have 
a chemical affinity or attraction-for those of another. 
Here if m measures of 4 and m measures of 
B were mixed, a union of particles ensues, and 
the new compound may assume the solid, liquid 
or aériform state according to its nature. If 
the compound be of the solid or liquid form, 
the two elastic fluids may wholly disappear ; if it 
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