3 o i Analyfis of the Air. 
qu. i i And if the attraction of cohefion 
of an un-elaftick air particle be proportion- 
able to its repulfive force in an elaftick ftate $ 
then fincc its elaftick force is found to be 
do vaftly great, fo muft that of its cohefion 
be alfo. Sir Ifaac Newton calculates from 
the inflexion of the rays of light, that the 
attracting force of particles, near the point of 
contad, is 10000,0000, 0000, 0000 greater 
than the force of gravity. 
Sulphur in a quicfcent fix’d ftate in a large 
body does not abforb the elaftick air, for 
a hard roll of Brimftone does not abforb 
air : But when fome of that Brimftone, by 
being powdered and mixt with filings of 
Iron, is fct a fermenting, and thereby reduced 
into very minute particles, whofe attraction 
incrcafes, as their lize decreafes; then it 
abforbs elaftick air vigoroufly : As may be 
feenin many inftances under Experiment 95. 
The Walton mineral, in which there is a 
good quantity of fulphur, did, when com- 
pound Aquafortis was pour’d on it, in Ex- 
periment 96, make a confiderable fermen- 
tation, and abforb a great quantity of elaftick 
air : But when the ferment was much in- 
creafed, by adding an equal quantity of 
water to the like mixture, then inftead of 
ablorb: 
