22.2 Dr. Cooper on Volcanoes 
3. ‘That it passes into and is accompanied by porphyries 
and amygdaloids like Lava. 
4, That the other characteristics of Lava, belong also 
and in equal degree to Basalt. 
As to the first. tna is a porphyritic mountain sur- 
mounted by columnar basalt. | Humb. per. narr. 237 note. 
Prismatic columnar basalt forms the base of AXtna: itis 
found in compact lava on the sides of AZtna. The rocks 
called the Cyclops opposite Catania, consist of columnar 
basalt. This is common also at La Frezza, at Monte Fi- 
noches, at Monte La Motta, Santa Anastasia, on the emi- 
nence at the town of Acireale, and below La Scala. Spa- 
lanzani. Ferber. All these are Sicilian and Vesuvian ba- 
salts. 
Spalanzani found pentagonal columnar Lava in the cra- 
ter of Voleano, one of the Lipari Isles. 3 Spal. tr. 195. 
Much columnar basalt formed of Lava atits entrance into 
the sea in the Eolian Isles, tna, and Ischia, according to 
Dolomieu, ib. p. 202. Prismatic basalt from Catania to 
Castello di Saci, ib. At Felicuda ib. p. 202. Observed 
also by Colonel Imrie. Figurate basalt at the summit of 
‘Etna, even within the inside base of the crater, ib. 208. 
Much figurate, columnar basalt at Monte Rosso described 
by Sir I. Strange 65 Phil. trans. see also 3 Spal. tr. 232, 
315. Gioeni says he has frequently found polyhedrous 
basalt in the artificial excavations of A‘tna on the sides of it, 
3Sp. tr. p. 208. Presque habituelle dans les pays volea- 
niques. 1 Brogn. Min. 472. Basaltic prisms for a great 
extent on a bed of volcanic ashes and pumice at Bolzena 
and Ronea. Ferber’s tr. 238. 
Much columnar basalt on Montesomma, adjoining Vesu- 
vius, according to Lord Winchelsea. The basalt of Monte 
Somma, not to be distinguished from that of County An- 
trim. 3 Geo. tr. 233. 
Sir W. Hamilton in his letters on the volcanoes of Italy, 
p. 257, mentions the columnar Lava that flowed from Vesu- 
vius in 1632. He compares the prismatic columns at Ca- 
lastro, to those of Bolsena, and the Giants Causeway. Pris- 
matic basalt found at the foot of Vesuvius itself, Brongniart 
art. Basalt, Nouv. Dict. de l’hist. naturelle. On the same 
authority they are found inthe Vincentin, and in many of 
the isles of the Greek Archipelago. The face of Monte 
