[ 7°3 ] 
meat feems to indicate, that the Fke of Eledricity 
is afFeded neither by the Prefence or Abfence of 
other Fire. For, as red-hot Iron, by Sir Ifaac New- 
tons Scale of Heat, is fixed to 192 Degrees, and as 
the Ratio between Sir Ifaac' 's Degrees and Fahren- 
heit's is as 34 to 180, it neceffarily follows, that the 
Difference of Heat between the hot Iron and the 
cold Mixture is 1040 Degrees ; and neverthelefs, 
this vaft Difference makes no Alteration in the Ap- 
pearance of the eledrical Fiame. We find likewife, 
that as the Fire, arifing from the Refradion of the 
Rays of Light by a Lens , and brought to a Focus y 
is obferved firft at fome fmall Diftance from their 
Surfaces, to fet on fire combuftible Subftances; the 
fame Effed, as I have before obferv’d, is produced 
in like manner by eledrical Flame. 
I may perhaps be thought too minute in fome of 
the beforc-mcntion'd Particulars; but in Inquiries 
abfirufe asthefe are, where we have fo little a priori 
to dired us, the greatefl Attention muft be had to 
every Circumftance, if we are truly defirous of in- 
veftigating the Laws of this furprifing Power. For, 
as has been laid upon another Occafion, by my ever 
honour'd Friend Martin Folkes Efq; our moft worthy 
Prefidenr, u That Eledricity feems to furnifh an in- 
exhauftible Fund for Inquiry 3 and fure Fhxno- 
mena fo various and fo wonderful can arife only 
<c from Caufes very general and extenfive, and fuch 
as muft have been defigned by the Almighty Au- 
“ thor of Nature for the Produdion of very 
“ great Effeds, and fuch as are of great Moment to 
a the Syftem of the Univerfef 
Yyyy 
if 
