On Earthquakes—their causes and effects. 915 
belongs or ong in that formation, commit an error of 
judgment, and conclude th 
with that part which! is sensible to the sight. The base of 
the mountain and bosom of the volcano, may, and is most 
likely to be, of primitive formation, mader'ying of course the 
more recent strata. 
If we admit of the extended existence of subterranean 
fires, it is far more reasonable to suppose they have their 
origin in the most deeply seated rocks, frequentl pie ode 
their destructive fires through a formation of © 
creation. 
Humboldt informs us that during an ouidenalie: near 
Guanaxuarto, in Mexico, the sound was confined to primitive 3 
schist. The same able naturalist pete us that earthquakes 
nt 
edge, I Sioa rest satisfied that my labour has been rewarded. 
