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ral. By the word lava is underftood, as 

 every one knows, a liquefied ftony fab- 

 ftance which has been in motion. When 

 a mountain is of a conical form, and has a 

 cavity refembling an inverted tunnel on its 

 top, or evident marks of one, and when 

 from this tunnel, as from a central point, a 

 number of ftony ftrata diverge towards the 

 lower parts with a waving form, or with 

 Inequalities and tumours, we cannot doubt 

 the prefence of lavas. It is equally indubi- 

 table, when we are certain of the volcani- 

 zation of the mountain from other figns, 

 and fee thefe ftony ftrata arifing from its 

 fummit, and tending downwards, with the 

 wavy appearance and inequalities before 

 mentioned, though there fliouk| be no ap- 

 parent indication of a crater. When we 

 afcend to the fummit of thofe Eolian liles 

 in which the remains of craters are no 

 longer vifible, we immediately difcover 

 confpicuous currents pf lava. There may, 

 however, be cafes, with refped: to moun- 

 tains that have fuftered the aclion of fire, 

 in v/hich, from want of local circumftar^ces,, 

 T 4 we 



