350 G. P. Scrope on Craters, and the Liquidity of Lavas. 
Val di Bué on the flank of Etna, the Caldera of Teneriffe, that 
of Palma, Santorini, or the external crater of Barren Island; 
which measure some three, five, or even six miles in diameter? 
But the crater of Vesuvius, formed in 1822, before my eyes, by 
explosions lasting twenty days, measured a mile in diameter, and 
was more than a thousand feet deep. The old crater of Somma, 
which half encircles the cone of Vesuvius, is about three times 
as wide as the crater of 1822. Are we, then, on that account 
must have been formed, 
overwhelmed three cities at the base of the mountain beneath 
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