[05. 



r»A 



'M 



^h 



fortli 



^ftli 



'Tthj 



in 



e 

 a 



V 



Hit of 



or 



do all 



ui 



er 



veW 



If 



• I 



n 



we 



''^ visible, 

 3iired oQt 

 le period 

 would be 

 miles in 

 y region 



Dr cones, 



licli tliej 

 durin 



.IT hart 



I than it 

 of 



a 







m^ 



O 



iH 



cc above 

 s on tt^ 



Ch. XXVI.J 



ANTIQU 



47 



swept away by a great flood, and all of them would have ex- 

 hibited some signs of its denuding action. To some, perhaps 

 it may appear that hills of such incoherent materials cannot 



I _ ^ .X. .^^...-^-^ . .^-^^ j'^ ^-h. -*« ^-^ ..x^ -J ^^ -J- _■-. MM mm ^ 



mere 



atmosphere must, in the course of several thousand years 



have obliterated theii 



original 



forms. But there is 



weight in this objection ; for although the steep slopes of 

 Monti Eossi, being still bare and composed in great part of 

 light scorise and fine volcanic sand, have been acted upon both 

 by wind and rain within the memory of persons now livino>, 

 yet the older hills have been protected from waste ever since 

 they have been covered with trees and herbage. Even before 

 dense vegetation has been established, such is the porosity 



materials, that almost 



falls upon them is instantly absorbed; and for the 

 reason that the rivers on Etna have a subterranean course 



same 



minor 



may remind 



may be the lapse of ages which we require for the OTowth of 



Ne 



time 



development. Its foundations 



that sea 



in which the shells of Aci Castello and Trezza flourished. 



». 6 that the events of the Glacial Period 



We 



may 



much 



tred thousand 

 assemblage of 



Castello 



and Trezza difi-er from the fauna now characterising the 



Mediterranean 









1 



uiiiity 



ic 





of 

 if 



e 



W^ 



