[ 33 ] 
been almoft exclufively drawn from recent volcanos, we 
cannot much wonder if they yet remain fo imperfedh 
Having dwelt a little, in the courfe of this paper, on 
the phylical geography, and particular vulcanic phaeno- 
mena of Auvergne, Velay, and the Veronefe and Vicen- 
tine territories ; I fhall beg leave to add a few obferva- 
tions of the like nature relating to the Euganean hilLs ; 
more efpecially as they produce other vulcanic concre- 
tions equally curious, and of a very different charadfer 
from any obferved in the provinces before mentioned. 
The Euganean hills form an irregular group in the plain 
of Lombardy, about feven miles nearly fouth by weft 
from Padua, and extend from north to fouth as far as 
Efte. The moft confiderable part of them compofes an 
irregular fort of chain, which extends in the above di- 
redlion; while other parts are feverally detached, and 
form ifolated mountains about the fkirts of this chain, 
particularly on the north-eaft fide, towards Abano. The 
outer ftdrt of the infire group may meafure perhaps from 
thirty to forty Englifh miles. The external characfters 
of this group exactly correfpond with the forms com- 
monly afcribed by naturalifts to vulcanic mountains in 
general*; lince the points of the chain before mentioned, 
as well as the ifolated members of it, are of various coni- 
cal, orbicular, and elliptical fliapes. As this group, there- 
fore, refts upon a perfect plain, it makes a very lingular 
appearance, and exadfly anfwers to the following lines of 
Ovid''^^, which, I hope, I may therefore be permitted to 
infert, though in a philofophical paper. 
(/; Met. lib. XV. 
F 
VoL. LXV. 
Extentam 
