and Fi wldanic Substances. 223 
Somma (an ejection of Vesuvius,) is exactly like the cliffs 
of Antrim, from Bengore head, to the river Bush. 1 Geol. 
trans. 234. The Paduan, (Euganean,) and Vincentin hills, 
and the Varonese Lava hills, such as Mont St. Luca, Mount 
Rose, Monte di Diavolo, Ronca, are columnar in whole or 
in part; and so is Radicofani. Ferber. tr. p. 61, 63, 230, 
241,148. In this he is corroborated by Desmarets, and 
by Sir John Strange in his paper on the columnar basalt of 
the Venetian state. 65. Ph. tr. for 1775, part I. 
Von Buch having examined the current of Lava, froin 
Vesuvius in 1794, declares it impossible to be distinguished 
from the Basalts of Bohemia, Silesia, Hesse, and Saxony. 
Breislak, § 688. This Lava, is exactly like that of Aitna 
and the Eolian Isles; of Hecla and ‘Teneriffe. Ib. § 689. 
So says Raspe, Ferb. tr. 61. 
Columnar basalt common in Iceland, according to Dr. 
Henderson’s trav. in that country. Dr. Geo. M’Kenzie 
says that the cavernous Lava of Iceland abounds in colum- 
nar basalt. 
The eruptions of Teneriffe in 1794 and 1797, were Ob- 
sidian and Basalt. Cordier and Humbold found columnar 
basalt plentiful at Teneriffe. So did Mr. Henry Bennet at 
Madeira. 1. Geol. Transac. : ; 
M. Bory de St. Vincent, found the ground strewed to a 
great extent with columnar Lava (basaltic prisms) very 
regular, at the Isle of Bourbon. : 
The accompanyments of Basalt of disputed origin, are 
the same as those of Lava. Thus at Muro] m Auvergne, — 
we find scoriz, cinders and puzzuolana above ; next com- 
pact basalt not to be distinguished from compact Lava ; 
then figurate, columnar, prismatic basalt of a fine grain, 
very compact fifty or sixty feet high; then tabular Basalt, 
then shistose Basalt. Breisl. § 693. 
Like Lavas, they cut through without enclosing any me- 
tallic substances. It is said that Galena has been found en- 
veloped in Basalt, which may well be the case, but this is 
anomalous and accidental, just as vegetable and animal re- 
mains may be found adhering to any slag that meets them in 
its way. ’ at 
I proceed next to shew that Basalt like Lava, exhibits 
marks of igneous origin, by its effect on the substances it 
encounters. 
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