Dr. ^all on AtlraSfion and Repulfion, 455 



bably, its exiftence and elafticity ; the light, 

 •which illuminates our globe, its rapid motions 

 and diverfified inflexions; and fire, its genial, 

 cxpanfile, and animating energy. Is it, there- 

 fore, confident with analogy, to exclude repul- 

 fion from that branch of phyfics, which che- 

 miftry comprehends? The fubjed certainly 

 merits further inveftigation : And I fhall ftate, 

 to my friend Dr. Wall, the fads and queries; 

 which I have now laid before this Society ; that 

 he may communicate to us, fuch limitations 

 or confirmations of his dodrine, as an attentive 

 review of it may fugged, to his ingenuous and 

 philofophic mind. 



JExTRACTS <?/ TWO I.ETTERs /rm Dr. Wall of 

 Oxford, to Dr. Percival, in Reply to the 

 foregoing Queries concerning Attraction and 

 Repulsion -, communicated to the Literary and 

 Philosophical Society. Read January 12 

 1785. 



DEAR SIR, 



J T gives me great pleafure to thinic that my 



paper on oil, &c. was fo far approved, as to 



be thought worthy of a place in your Memoirs. 



I am by no means pofitive, that my hypothefis' 



^ S 4 will 



