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ferved by Deflandes, I find them perfe£lly 

 accord, except that the ebullition, which 

 certainly takes place, was not obfcrved by 

 him. When we proceed to apply them 

 to volcanos, with refped: to the falling of 

 water on their bufning mouths, we ihall 

 be ready to conclude that water fo falling 

 cannot caufe eruptions. To enable myfelf, 

 however, if not to decide this queftion, at 

 leaft fomewhat more to elucidate it, I made 

 fome other experiments, both on different 

 metals and lavas in fufion. ' I made ufe of 

 iron, copper, tin, and lead. With refped: 

 to the iirft, I employed filings of it, to faci- 

 litate its fufion ; as I have already remarked 

 in the Introdu^Ilion to this work, that, by 

 this means, a decifive principle of fufion 

 may be obtained in this metal in the fur- 

 nace. The crucibles for thefe experiments 

 were wide at the top, narrow at the bottom, 

 and of confiderable capacity ; and I never 

 entirely tilled them with metal, that there 

 might be room to pour on it a fufficient 

 quantity of water. 



After 



