THE GRAND ERUPTION OF VESUVIUS IN igo6 647 



bocca of this principal stream is above the monument referred to and 

 probably near the piano. 



A second large stream, which probably issued from a bocca some- 

 what farther to the west, passed over vineyards and isolated houses, 

 and descended to a point near Trecase and only 670 feet (vertically) 

 above Torre Annunziata in a direction a httle west of north (see 

 Fig. i). Fig. 14 shows where this stream had passed through a 

 grove of small stone pines, some of which it broke off and carried 

 along. The several smaller streams were all higher up upon the 



Fig. 10. — View of the main lava stream of 1906. In the vallone below Bosco- 

 trecase. (The lava filled the valley with arching upper crust which collapsed after 

 outflow of lava 'beneath.) 



slopes and in the vicinity of this one. They could be distinctly 

 followed by the eye from the high point reached on the 15th. 



The third large stream the writer has not personally followed, 

 but it was reported to him by Professor Sabatini to extend in a direc- 

 tion parallel to and north of the narrow stream of Caposecchi (1834) 

 and to end near Terzigno. 



The streams personally examined presented a black scoriaceous 

 surface made up of blocks irregular in shape and generally quite 

 separate from each other, varying in size from a man's fist to great 



