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the ftrongcr and more Jucid colours- 

 and be more and more difficultly diverted 

 Qu. 29. So Q11, 30; he obfervesof air, that 

 denfc bodies by fermentation ratify into 

 " fcveral forts of air, and this air, by fer- 

 mentation, and fometimes without, returns 

 into denfc bodies." And fince \vc find 

 in fact from thefe Experiments, that air a- 

 rifes from a great variety of denfe bodies, 

 both by fire and fermentation, it is probable 

 that they may have very different degrees of 

 elafticity, in proportion to the different fize 

 and denfity of its particles, and the different 

 force with which they were thrown off in- 

 to an elaftick ftate. « Thofe particles ( as 

 " Sit Isaac Newton obferves) receding 

 if from one another, with the greatcft re- 

 pulfive force, and being moft difficultly 

 brought together, which upon contaft 

 cohere moft ftrongly." Whence thofe of 

 the weakeft elafticity, will be leaft able to 

 refift a counter-a&ing power, and will there- 



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fore be fooneft changed from an elaftick 

 to a fixt ftate. And 'tis confonant to reafon 

 to think, that the air may confift of infinite 

 degrees of thefe, from the moft elaftick and 

 repelling, till wc come to the more fluggifh, 



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