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Analyfis of the Air. 



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greater proportion of air is found in the 

 folid than the fluid parts of bodies; may we 

 not with good reafon conclude, that it is very 

 inftrumental, as a band of union in thofe 

 bodies, " Thofe particles (as Sir Ifaac 

 Newton obferves) " receding from one 

 " another with the greateft repulfive force, 

 and being mod difficultly brought together, 

 which upon contact cohere mod ftrongly. 

 qu. ft" And if the attraction of cohefion 

 of an un-elaftick air particle be proportion- 

 able to its repulfivc force in an elaftick ftate j 

 then fincc its elaftick force is found to be 

 fo vaftly great, fo muft that of its cohefion 

 be alfo. Sir Ifaac Newton calculates from 

 the inflection of the rays of light, that the 

 attracting force of particles, near the point of 

 contact, is 10000,0000,0000,0000 greater 

 than the force of gravity. 



Sulphur in a quiefcent nYd 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 

 hicreafes, as their fizc dccreafes; then it 



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