( 3S3 ) 



its way out with detonation, burfting and 

 throwing up the fragments of the lava, 

 from its expanfive force being greatly inr- 

 creafed by heat. The ejedions v/ill b€ 

 great, fmall, or moderate, according to the 

 different quantities of this gas collected and 

 difengaged. 



Againft this hypotheGs two objedlions 

 may certainly be made ; the one, that, ad- 

 mitting it, the ignited lava would be fo 

 bright that the eye could not bear to look 

 on it ; as w^e know that it is with difficulty 

 we can bear to look on a fmall flame ani- 

 mated by oxygenous gas ; whereas, on the 

 contrary, the rednefs of this lava is not 

 greater than that of melted glafs or metal. 

 The other objediion is, that the burning 

 lavas adted on by this gas w-ould be con- 

 verted into a glafs, or homogeneous enamel ; 

 whereas the lavas continually throve n out 

 by Stromboli, befides that the bafe of the 

 primitive reck is fufficiently recognizable in 

 them, ftill preferve their llioerls and feltfpars 

 in their original ftate of cryftallization. 



Both 



