1858.] 



ABICH ETNA. 



125 



a copy of the view of Etna taken by me from the hillock near 

 Patemo, on the left side of the valley of the Simeto. It shows Etna 



from the southern side, exhibiting the 

 outlines of a profile to be obtained by 

 a section through the mountain in the 

 direction of the longitudinal axis of 

 the Yal di Bove. Although this view, 

 taken from the very base of Etna, 

 does not give a commanding view so 

 complete and so free from the influ- 

 ence of perspective as the views fig. 8 

 and fig. 9, it is not difficult to recog- 

 nize the original flattened cone, the 

 "terrain bombe" of ab, fig. 8, as well 

 as the dome-shaped part of the moun- 

 tain between e and / of fig. 8. The 



^ 2 



iap 



53 





rO 



►TB 



'r^ J gibbosity arising from the modem 

 '^ o lava-formation after the " souleve- 



K"^ ^r^v.4- " ^^ T?4-^r> ^^Jjg SamC 



'^'^i 



•^ 



^ 



ment " of Etna (the same indicated 

 by the dotted portion in fig. 8) ap- 

 pears here more evident than in the 

 figure referred to, because it was from 

 the western side, in the direction of 

 Bronte, that the eruptive materials 

 have found, very often and on a large 

 scale, their way from the top of the 

 mountain, producing a sensible local 

 increase of masses on that side of 

 I the slope which in the view fig. 10 is 

 marked a. It is an effect similar to 



II 



o ^ that produced by eruptive forces only, 

 'S "I which I tried to illustrate bv the 





to illustrate by 

 woodcut accompanying my paper " on 

 the changes which the cone of Vesu- 

 vius has undergone within the last 

 nineteen years." The view in fig. 10 

 is of peculiar interest, as it shows 

 the basaltic beds (lava) of Ademo 

 and Patemo (b) in their immediate 

 superposition upon the clastic and 

 argillaceous beds of the same regene- 

 rated rocks of secondary age, as those 

 make their appearance on the right 

 1 3 hand of the Simeto, and are supposed 

 to stretch far in a northern direction 

 under the base of the older volcanic 

 formation of Etna. 



It is a fact of importance, that 

 both the basaltic hillocks of Paterno 



^6 



