[ 6 S9 3 
and inflammable Minerals : Nor, if there were, could 
they burn, and caufe Convulfions of the Earth, un- 
lefs there were proper Cavities, and Conveyances 
of Air ; as in Coal-Pits, when fet on fire. 
But even from thefc Coal-Pits, when fired, do 
we ever find any thing like an Earthquake produc’d ? 
Nor did we obferve, in thefe two laft Earthquakes, 
any Fire, Vapour, Smoke, or Smell; or any kind 
of Eruption in the leafl, in fo great a Struggle of 
the Superfice, as affeded a Circle of 30 Miles in 
Diameter. 
Indeed this Confldcration alone, of the Extent of 
this Surface, is fufficient to overthrow any Suppo- 
lition of Earthquakes being chiefly owing to fubter- 
rancous Vapours. For it cannot poffibly be ima- 
gined, that fuch can have fo immenfe a Force, as 
to ad upon that Compafs inflantaneoufly, all at once, 
and never break Ground, fo as to be dtfcoverable to 
Sight or Smell. Many Accounts we have of a little 
Fire-ball burfling in the Air, at a great Diftance, 
and inflantly propagating a fulphureous Smell all 
around it for Miles. 
If the Motion of a Superficies of 30 Miles Dia- 
meter was owing to Fumes and Vapours, we ought 
rcafonably to find forne great Difcharge of them, 
like a Coal-Pit fired : The Operation of it ought to 
be Hours and Days in Continuance, not infiantane- 
ous : And the Evaporation of fuch a Quantity of 
inflammable Matter requires a long time to evacuate 
itfelf. 
There is another Argument, which, in my Opi- 
nion, utterly overthrows thefc Suppofltions ; and 
that is, a due Conflderation of Springs. If we would 
Pp p p 2 form 
