goi AnaJyJis of the Air. 



", tact cohere mod ftrongly. Qu. 3 1." And 

 if the attraction of cohefion of an unelaftick 

 air-particle be proportionable to its repulfive 

 force in an elaftick ftate ; then, fince its ela- 

 ftick force is found to be fo vaftly great, fo 

 mull: that of its cohefion be alfo. Sir -Ifaac 

 Newton calculates from the inflection of the 

 rays of light, that the attracting force of par- 

 ticles, near the point of contact, is 10000, 

 0000, 0000, 0000 greater than the force of 



gravity. 



Sulphur in a quiefoent 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 mix'd with filings of Iron, is 

 fet a fermenting, and thereby reduced into 

 very minute particles, whofe attraction in- 

 creafes as their fize decreafes ; then it abforbs 

 elaftick air vigoroufly : As may be ken in 

 many inftances under Experiment 95. The 

 Walton Mineral, in which there is a good 

 quantity of fulphur, did, when compound 

 Aqua-fortis was poured on it, in Experiment 

 96. make a confiderable fermentation, and 

 abforb a great quantity of elaftick air : But 

 when the ferment was much increafed, by 

 adding an equal quantity of water to the like 



mix- 



, 



