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13. The great Queftion then with us, is, how the 
Surface of the Earth is put into that vibratory and 
electric State by Heat and Drinefs? We mud needs 
acquit the Internal of the Earth from the Charge 
of thefe fuperficial Concuflions. How is the ethereal 
Eire crouded together, or excited, fo as to caufe 
them ; feeing, in our ordinary electrical Experiments, 
we make ufe of Fridion ? 
But that Fridion alone does not excite Electricity, 
we know, from the obvious Experiment of Flint 
and Steel ; where the Suddennefs of the Stroke, and 
Hardnefs of the Matter does it. Another Method 
of exciting it, is the letting off a Number of great 
Guns i which fo crouds the ethereal Fire together, 
as to electrify glafs Windows} obferved by my 
Friend the Reverend Dr. Stephen Hales. The Au- 
rora borealis , aujlralis y all kind of Corufcation, Me- 
teors, Lightning, Thunder, Fireballs, are the Ef- 
feds, and may reciprocally be the Caufe, of Eledri- 
city } but how, in particular, we know nor. 
Come we to the animal World, we muft needs 
afTert, that all Motion, voluntary and involuntary, 
Generation, even Life itfelf, all the Operations of 
the vegetable Kingdom, and an Infinity more of Na- 
ture's Works, are owing to the Adivicy of this elec- 
tric Fire} the very Soul of the material World. 
And, in my Opinion, it is this alone that folves the 
famous Qucftion, fo much agitated with the Writers 
in Medicine, about the Heat of the Blood. How 
thefe, how Earthquakes, are begun and propagated, 
we are yet to feek. 
We may readily enough prefume, that the Con- 
tad between the Eledric and the Non-eledric, 
which 
