[ 41 ] 
perpendicularly, in columns, as it were. The annexed 
gure though Iketched chiefly from memory, may ferve 
to give fome idea of this phaenomenon. I have often ob- 
fervedthe granite, of theEuganean hills particularly,^ af? 
feding fuch orbicular and laminated forms ; as may be 
feen in the figure <'?>'reprefenting a perpendicular fedtion 
of a fimilar bank in thefe hills. Indeed, from this and other 
fa6ls, which I have occafionally mentioned in the courfe 
of my paper, there feems to be a flrong analogy between 
granites and many particular vulcanic concretions. Ano- 
ther of the Euganean hills, called Monte Uliveto, or the 
Mount of Olive Trees, near Teolo, is chiefly compofed of 
a confufed aggregate of fmaller globular vulcanic balls, 
which are rather folid than laminated, and of a hard fer- 
ruginous fubflance, of a dark-brown colour, much re- 
fembling fome common ferruginous geodes I have feen. 
The annexed figure reprefents a group of them. This 
may fuffi.ee for a fpecimen of the more curious vulcanic 
productions of the Euganean hills, and united to the ob- 
fervations before made, may perhaps fhow, how little we 
are acquainted with the ftruCture and relative phaeno- 
mena of vulcanic bodies in general. I fliall not enter 
into any account of other more common productions of 
this kind ; and fliall only mention, that, during my fum- 
mer’s refidence at the baths of Abano, I made a collec- 
tion of the Euganean lava^ which is now in the public 
mufeum at Padua. Since fuch productions are rather cal- 
culated to illuflrate the phyfical topography of the coun- 
iP) Fig. S- ii) Fig. 6. {r) Fig. 7, 
VoL, LXV, G 
try 
