396 STRUCTURE AND ACTION OF VOLCANOS. 



B. The lowest and Southern Margin of the Crater, opposite to Bosche Tre Case. 



Toises. Eng. ft. 



After the eruption of 1794, this edge became 400 (426 

 Eng.) feet lower than the Rocca del Palo ; therefore, if 

 we estimate the latter at 625 toises (3996 English feet) 559 3574 

 Gay-Lussac, Leopold von Bueh, and Humboldt, 1805, baro- 

 metric - 534 3414 



Humboldt, 1822, barometric 546 3491 



C. Height of the Cone of Scoria inside the Crater, which fell in on 

 the 22d of October, 1822. 



Toises. Eng. ft. 



Lord Minto, barometric 650 4156 



Brioschi, trigonometric, according to different combinations 



either 636 4066 



Or 641 4098 



Probable final result, for the height of the above-mentioned cone of scoriae, 

 646 toises, or 4130 English feet. 



D. Pimta Nasone, highest summit of the Somma. 



Toises. Eng. ft. 

 Schuckburgh, 1794, barometric, probably computed by his 



own formula , r i. . - : ^ : .-.,**/. .?.' '* >C. > -* - - 584 3734 

 Humboldt, 1822, barometric, Laplace's formula - - 586 3747 



E. Plain of the Atria del Cavallo. 



Toises. Eng. ft. 

 Humboldt, 1822, barometric 403 2577 



F. Foot of the Cone of Ashes. 



Toises. Eng. ft. 



Gay-Lussac, Leopold von Buch, and Humboldt, 1805, baro- 

 metric 370 2366 



Humboldt, 1822, barometric .... *\ -'_> 388 2481 



G. Hermitage del Salvatore. 



Toises. Eng. ft. 



Gay-Lussac, Leopold von Buch, and Humboldt, 1805, baro- 

 metric 300 1918 



Lord Minto, 1822, barometric 307.9 1969 



Humboldt, 1822, barometric repeated .... 3Q8.7 1974 



Part of my measurements have been printed in MonticellF s Storia 

 de' fenomeni del Vesuvio, avyenuti negli anni 1821-1823, p. 115; 



