

620 



i 





> 





,. 







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CHAPTEE XXV. 



■ 



a 



** 





I 



volcanic district of Naples — continued. 



DIMENSIONS AND STRUCTURE OF THE CONE OF VESUVIUS FLUIDITY AND 



MOTION OF LAVA — ROPY SCORI2E — DIKES — HYPOTHESIS OF ELEVATION CRATERS 

 NOT APPLICABLE TO SOMMA AND VESUVIUS — SECTIONS SEEN IN VALLEYS ON 



THE NORTH SIDE OF MONTE SOMMA ALLUVIUMS CALLED 'AQUEOUS LAVAS ' 



ORIGIN AND COMPOSITION OF THE MATTER ENVELOPING HERCULANEUM 



AND POMPEII CONDITION AND CONTENTS OF THE BURIED CITIES — SMALL 



NUMBER OF SKELETONS STATE OF PRESERVATION OF ANIMAL AND VEGE- 

 TABLE SUBSTANCES — ROLLS OF PAPYRUS STABIJE TORRE DEL GRECO 



CONCLUDING REMARKS ON THE CAMPANIAN VOLCANOS. 



Structure of the cone of Vesuvius. — Between the end of the 

 eighteenth century and the year 1822, the great crater of 



Vesuvius had been gradually filled by lava boiling up from 



below, and by scorise falling from the explosions of minor 

 mouths which were formed at intervals on its bottom and 

 sides. In place of a regular cavity, therefore, there was a 

 rough and rocky plain, covered with blocks of lava and sco- 



riae, and cut 



by numerous fissures, from which clouds of 

 vapour were evolved. But this state of things was totally 

 changed by the eruption of October 1822, when violent ex- 

 plosions, during the space of more than twenty days, broke 



mass 



immense rrulf or chasm 



mi 



es in circumference when 

 measured along the very sinuous and irregular line of its 

 extreme margin, but somewhat less than three quarters of a 

 mile in its longest diameter, which was directed from N.E. 



to 



W 



The depth of this tremendous 



been 



estimated : for from- the hour of its formation it 

















-linh. 



: . 





■led ;•: ; 





• 





»4 



': b 



Ufrl, 





com j h 

 lata 









toft 





L. 







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* Account of the Eruption of Ve- 

 suvius in October 1822, by G. P. 



Scrope, Esq., Journ. of Sei. &c. vol. xv 

 p. 175. 



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