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[Cn. XXVI. 



side comparable to the Val 

 del Bove. In tlie case of 

 Etna we are unable to de- 

 cide wbich of the two foci 



AorB, %. 72, gaveventto 

 the earliest eruptions, but 



it is clear that after b 



or 



the focus of Trifoglietto) 

 was spent, the main vent 

 of Mongibello continued in 

 full vigour, 



and 



over- 



whelmed with its lavas 

 and scoriae the minor cone 

 d, i until it reduced the 

 whole to one slope l, /, I. 

 Subsequently the chasm 

 called the Val del Bove, I 

 i h, was formed, chie% I 

 presume b j explosions simi- 

 lar to those which are sup- 

 posed in Vol. I. p. 630, to 

 have removed the old cen- 

 tral portion of Somma be- 

 fore the modern cone of 

 Vesuvius was built up. 



The arrangement of tlie 

 beds seen between h and i, 

 fig. 72, in the great preci- 

 pice at the head of the Val 

 del Bove, is of peculiar 

 geological interest, more 

 especially the horizontality 

 of those beds of lava which 

 are shaded with a dark tint 

 immediately below A*. In 

 the entire absence of dip 

 which they exhibit, they 



are 



strikino-ly contrasted 



with lower beds seen m 



) 



&■ 



> 



:S^'^-' 



tie < 



fl 



lava 



iiiar 



the 



the n^i^ 

 tatic 



i 



\(r\ 



a 



reiJ 



a. 



rege 



ifltO 



the 

 Madeii' 



jreat pr( 



surface, i 

 a red ba 

 lying tli( 

 less tlia: 

 be alm( 

 • upper s( 



iS^o liyp' 

 a plaus 

 earreut, 

 plieuomi 



at tlili 

 TTli 



en 



I gave tL 

 as it has 

 l^uted till 



o^^twaixls 

 of II 



similar 



for 



oun 



D 



1 



a 



liiatio 

 mount. 



7^ the 

 If' ^'^^ 



