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 Tid a streai! 



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Ch. XXVI.] 



ERUPTION OF AUGUST 185.2. 



29 



r 



finally a fifth, lower still, wlience a torrent of lava flowed, 

 which spread itself with great velocity over the Yal del Bove. 

 When it arrived at the precipice called the Salto della 

 Giumenta at the head of the valley of Calanna, it poured 

 over in a cascade, and made an inconceivable crash as it was 

 dashed against the bottom. So 



immense 



dust it raised by the abrasion of the tufaceous hill over which 

 the hardened mass descended, that the Catanians were in 

 great alarm, supposing a new eruption to have burst out in 

 the woody region, exceeding in violence that near the summit 



of Etna. 



Mr. Scrope observed this current in the year 1819, slowly 



advancing down a considerable slope, at the rate of about a 



yard an hour, nine months after its emission. The lower 



stratum being arrested by the resistance of the ground, the 



upper or central part gradually protruded itself, and, being 



unsupported, fell down. This in its turn was covered by a 



mass of more liquid lava, which swelled over it from above. 



The current had all the appearance of a huge heap of rough 



and large cinders rolling over and over npon itself by the 



extremely 



The con- 



traction of the crust as it solidified, and the friction of the 

 scoriforni cakes against* one another, produced a crackling 

 sound. Within the crevices a dull red heat might be seen 

 by night, and vapour issuing in considerable quantity was 



visible by day.^ 



Eruption of August 1852.— 



[ugust- 1852. — Of all the recorded eruptions 



r 



of Etna, with the exception of that of 1669 already men- 

 tioned, that which began in August 1852 and continued till 

 May of the following year, was the most remarkable for the 



hich was poured out. In the annexed wood- 

 ^e ffiven the outline of the two cones (marked 



volume 



Map, fig. 71) from 



issued, and in fig. 84 the course of the great 



eam is 



from 



Milo 



left, and to Zafarana on the right. Scoriae were thrown up 



cm 



r 



^ Scrope on Volcanos, p. 102. 



