:192 ‘Mr. Bow porn’s Obdjfervations 
-It feems not improbable, that the ele&iric fluid i is heteroge- 
 neous as well as light. | 
'The heterogeneoufnefs of light is inferred from ‘its ius 
which are faid to vary Propaitiensbiys-- as the fize of the parti- 
cles doth vary : the variation | icuous by a prifm, 
and by other means, which clafs the parabiles. according to their 
refpective magnitudes,or degrees of refrangibility and reflexibility. 
Befide this, another reafon may be fuggefted; from which the 
heterogeneoufnefs of light may be deduced: namely, becaufe 
it exhibits effects fimilar to fome of thofe of ele&ricity. For 
example, a globe or pane of glaís wármed' in the fan or before 
a fire, will fucceflively attract and repel {mall cork balls, down, 
and fuch like bodies infulated, and ‘properly circumftanced ; 
and will thew other figns.of electricity communicated to: bs 
glafs by the fun or fire. 
So, in regard to eleétricity, its ditur may be cel- 
lected from its producing effects refembling fome of thofe of 
light or fire ; which are here confidered as equivalent terms." 
. Ele&rieity and fire differ in many refpe&s, and'in fome théy 
agree ; as hath been fhewn in Dr. Franklin's letters on ele&ri- 
city. So far as they agree in their effects, their nature may be 
prefumed to be alike : Or rather, from that agreement and fi- 
militude of effects, I think it may be inferred, that they are 
mixt with, and generally do accompany each other’; and that 
ach produces its own effect at the time of their j joint operation. 
The effects of ele&ricity, fimilar to thofe of fire, being pro- 
-duced by. the.fire mixt with it, sand the effects of fire, refem- 
Sling thofe of electricity, birds by the electritity mist 
with that: the compound taking its name from ithe predo- 
‘tainant principle, — 
Thus, 
