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furnace — No explcjion produced by pouring 

 water on them^ when it is not introduced 

 , within them — -The explofion the Jlronger 

 the more the water penetrates into them — ■ 

 The reftdts the fame 'when fea-water is 

 I fed iiftead of frefh — Conclifion^ that 

 nsoater is incapable of producing eje&ions 

 'when it falls on the burning craters of 

 volcatws ; but that it muft produce very 

 violent one& when it penetrates into them 

 from below or by the fides — The different 

 permanent gafcs dfcoverable in volcanos 

 feem alone to be the caufe of the more mo- 

 derate and fmaller eruptions — The fymp- 

 toms^ and inceffant eje&ionsy of Stromboli 

 cannot be caufcd by the evaporation of 

 water ^ nor by that of the liquefied lava^ 

 but mujl depend on the aEiivity of fome 

 permanent gafes — Enqui?y whether this 

 gcis be hydrogenous — That fuppoftion re- 

 jeBed — // cannot be fuppofed to be atmo' 

 fpheric air — The hypothefis which has 

 recourfe to oxygenous gas to explain the 

 phenomena of the volcano of Stromboli^ 

 feems leaf improbable, 



HAVING 



