244 STRUCTURE AND ACTION OF VOLCANOS. 



Toises. Eng. ft. 



Poulett Scrope, 1822, barometric, somewhat un- 

 certain from the proportion between the diameters 

 of the tube and cistern being unknown . . 604 3862 



Monticelli and Covelli, 1822 624 3990 



Humboldt, 1822 629 4022 



Most probable result 317 toises, or 2027 English feet, above the 

 Hermitage ; or 625 toises, or 3996 English feet, above the level of 

 the sea. 



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 Buch, and Humboldt, 



1805, barometric 534 3414 



Humboldt, 1822, barometric . "' '' V . . 546 3491 



C. Height of the cone of scoria inside the crater, which fell in on 



the Wld of October, 1822. 



Toises. En. ft. 



Lord Minto, barometric 650 4156 



Brioschi, trigonometric, according to different com- 

 binations 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. Punta Nasone, highest summit of the Somma. 



Toises. Eng. ft. 



Schuckburgh, 1794, barometric, probably computed 



by his own formula 584 3734 



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



