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Cxplofioii and fhaking of the containing 

 ■veflels. 



But other fadls, more confentaneous to 

 the nature of volcanos, prove the contrary. 

 It is well known to all mineralogies, that, 

 if water be dropped upon melted copper 

 or filver, the abundant vapours which arife 

 will produce a kind of noife, but no explo- 

 fion. 



The elegant experiments of Deflandes, 

 relative to the effeds of water poured upon 

 melted glafs contained in capacious cru- 

 cibles, in a glafs-furnace, are equally de- 

 ferving attention in themfelves, and appli- 

 cable to the prefent queftion. I fliall give 

 a brief abftrad: of them. A glafs of water 

 having been thrown on a quantity of melted 

 glafs, the water fuddenly formed a globule 

 without producing the leaft found : it af- 

 fumed, or feemed to aflame, a red colour, 

 fimilar to that of the crucible and the melted 

 glafs. It rolled on the furface of the glafs ; 

 and, nearly in the fame manner as lead 

 A a 4 is 



