[^ 



"■ ^Uv 



•eb 



'^Uo 



k 





ift, 



• ^nes 



^^?li 



■^l, 



of 



t ^ 



the 



n>; 



; % 



^•nh,rn 



on the 



.np 



uanbei 



IDa 



^ ^, that 

 ^•"" death. 



■ ^iiiriitest 

 n ^tli the 



:h so brittle 



'JA 



JiTttime, 



of several 

 -. Pol i 



iv burii?'! 



he spire 



of 



,rr to sea- 

 ; J to the 



orer- 

 I (Id rea^^ 



lias 



beefl 



-'1 3. 



bU! 



nfi 



\ 



500 



Ch. xliv.] blown sand, and volcanic ejections 



marine shells, in which some terrestrial shells are enclosed 

 entire. By the shifting of these sands the ruins of ancient 

 building's have been discovered; and " 



m some 



rells have been bored to a great depth, distinct strata, separ- 

 ated by a vegetable crust, are visible. 



some 



Quay, large masses have become sufficiently indurated 

 to be used for architectural purposes. The lapidification, 

 which is still in progress, appears to be due to oxide of 

 iron held in solution by the water which percolates the 

 sand."^ 



IMBEDDING OP ORGANIC AND OTHER REMAINS IN VOLCANIC 



PORMATIONS ON THE LAND. 



some 



tion in former chapters, when speaking of the buried cities 

 around Naples, and those on the flanks of Etna.f From the 

 facts referred to, it appeared that the preservation of human 

 remains and works of art is frequently due to the descent of 

 floods caused by the copious rains which accompany erup- 

 tions. These aqueous lavas, as they are called in Campania, 

 flow with great rapidity; and in 1822 surprised and suffo- 

 cated seven persons in the villages of St. Sebastian and 

 Massa, on the flanks of Vesuvius. 



In the tuff's, mor 



3over, or s 

 impressions 



mud 



been observed. Some of those, formed after the eruption 



Naples. 



museum 



may become indirectly the means 



terrestrial remains, by overflowing beds of ashes, pumice, and 



matter, which may 



human remains 



are better non-conductors of heat than volcanic dust and 



melted 



superimposed lava-current. After consolidation, the lava 



mor 



* Boase on Submersion of Part of the of Cornwall, vol. ii. p. 140. 



Mount's Bay, &c.. Trans. Eoy. Geol. Soc. 



t Vol. I. p. 640, and Vol. II. p. 22 



