THE GRAND ERUPTION OF VESUVIUS IN IQ06 639 



violence to produce considerable panic, but no damage. To this 

 accompaniment of shocks a new mouth or bocca opened near the 

 shoulder of the mountain (the piano) above Torre Annunziata 

 (see Fig. i), from which lava issued and descended in the direction 

 of Boscotrecase and Torre Annunziata. Either before, at the same 

 time, or shortly thereafter, two other large streams issued within 

 the same general region and descended the near-lying slopes, the 

 one toward Trecase and the other toward Terzigno. On the mom- 



si g i u s e p p e 



Trrzigno 



Bobtottale 



;Torre AnnunnAia. 

 PompeL 



Fig. I. — Sketch map of Vesuvius and surroundings (areas of lava streams and 

 of lapilli distribution, approximate only). 



ing of the 8th the greatest of the lava streams was making its way 

 through Boscotrecase, and before nightfall it had enveloped the 

 city and was on its way down the vallone to Torre Annunziata. It 

 came to a halt at the camposanto in the outskirts of that city. 



Apparently simultaneously with the emission of lava from the 

 new hocche a series of violent explosions partly destroyed the central 

 crater, and sent small fragments of lava, lapilK, and ash high into 

 the air, to be carried by a westerly wind over the towns east and 



