222 Dr. Cooper on Volcanoes 
3. That it passes into — is accompanied by porphyries 
and amygdaloids like 
4. That the other vhietctieibtion of Lava, belong also 
and in equal degree to Basalt 
As to the first. tna is a ‘a. porphyritic mountain sur- 
mounted by columnar basalt. 1 Humb. per. narr. 237 note. 
Prismatic columnar basalt forms the base of Ama: it is 
found in compact lava on the sides of Atna. The roc 
called the Cyclops opposite Catania, ee of columnar 
basalt. This is common also at La Frezza, at Monte Fi- 
noches, at Monte La Motta, Santa ent 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. et 202. Eanaie basals fn m Catania to 
Much figurate, columnar basalt at Monte Rosso described 
by Sir I. Strange 65 Phil. trans. see also 3 Spal. tr. 
315. Gioeni says he has frequently found polyhedrous 
basalt in the artificial excavations of A.Qtna on the sides of it. 
3 Sp. tr. p. 208. Presque habituelle dans les pays volca- 
niques. 1 Brogn. Min. 472. Basaltic prisms for a great 
extent on a bed of volcanic — and pumice at Bolzena 
and Ronca. Ferber’s tr. 
Much columnar basalt on ort he 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, 
art. em Nouv. Dict. de Phist. naturelle. On the same 
authority they are found inthe Vincentin, and in many of 
the isles of the Greek Archipelago. The face of Monte . 
