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mix’d with Air, the Repulfion of any two Particles 
of Air will be diminifh’d, in proportion as a Particle of 
the other Fluid, inlinuating itfelf between them, attracts 
them towards itfelf on either Side. The fame thing 
will happen to the other Fluid, in refpeft of the Par- 
ticles of Air, which mixing with its Particles, do in 
the fame riianner deftroy their Repulfion. Thus, if 
we allow an Attraflion flrong enough between the 
Parts of two elaftic Fluids, it is poffible, that by Fer- 
meritation a Solid may be made out of two elaftic 
Fluids, which would have ftill continued fluid with- 
out fuch a Mixture. We are taught by Chemiftry, to 
mix Fluids together, which immediately coalefce in- 
to a Solid. When Brimftone Matches are burning, 
the Efflmia of the Sulphur repel each other to great 
Diftances, as may be known by the fulphureous Smell 
upon fuch an Occafion. Now, though thefe Par- 
ticles repel each other, they attrad the Air very 
ftrongly, as appears by the following Experiment : 
Take a tall Glafs Receiver clos'd at Top, holding 
about four Quarts of Air, and having put its open 
End over a Bundle of Brimftone Matches on Fire, 
ftanding up in the Middle of a large Difh with Wa- 
ter in it, (to keep the Air from coming in at the 
Bottom of the faid Receiver) you will obferve, that 
not only as foon as the Matches arc burnt out, but 
a' good while before, the Air, inftcad of being ex- 
panded by the Flame of the Brimftone, will retire 
into lefs Gompafsj the Water beginning to rife from 
the Difti^ up' into the Receiver, and continuing fo to 
db till fome time aftef the Matches arc burnt out 5 
fo that there will be in the Receiver only three 
Qu^rtsof Air, inftead of four (more or lefs, in pro- 
Z 2 portion 
