[ n ] 
in another ftate, but manifeft alfo plainly their primary 
qualities and ftru6ture, and equally prove, by their par- 
ticular diredtions, that they never can have been thrown 
up fortultoudy, from the bowels of the earth, like the 
Monte di Genere, 8cc. ; but have fulfered fire infiatu quo,, 
or locally, without the leaft appearance of fubverfion, or 
change of place. The fame feems alfo very probable of 
many other mountains, that are purely vulcanic, from 
the neceflity of the local origin of their particular orga- 
nizations, which I have before confidered ; andfuppofing 
even that fuch mountains manifefl no internal nor ex- 
ternal figns of their primitive ftru61ures or qualities. 
From the preceding obfervations it appears, I think, evi- 
dent, that fubterraneous explofions and eruptions are 
merely accidental phccnomena, that are by no means ef- 
fential to the production of all vulcanic mountains, as 
has been commonly imagined. This notion feems to 
have proceeded from the affinity often obfervable in the 
qualities and external forms of many fuch mountains, 
and thofe of real volcanos. But I have already obferved, 
that there are many vulcanic mountains of a totally dif- 
ferent form from the common volcanos; and though 
their lava may fometimes be fimilar in its qualities, yet 
the regular organization of it, in the former, frequently 
makes a moft effential difference. For, as I before faid, 
what does Vefuvius or ^tna prefent to us but a heap of 
ruins, which give us not the leaft idea of the ftruClures to 
which they belonged ? And though they may lead and 
enlighten the chymift, yet they afford but little inftruc- 
E % tion 
