relative to Light and tbe eleGiric Fluid.. IQI 
Befide thefe, an. objection fimilar to-one of thofe,.which 
have. been advanced.againft the common hypothefis, and which 
may. be {feen in the proper place, may be alledged againft this s 
for the conftant vibration, with which the elaftic fluid muĝ 
bc agitated, would communicate to {mall . bodies,- and even to: 
large ones fufpended in that fluid, a conftant tremulous, vabra- 
tory. motion. In fuch a cafe it would be difficult to examine the 
texture and vifible qualities of thofe fimall bodies, as one necef= 
fary mean of examination, a great deal of light, would encreafe 
the vibration ; and thereby. render tbe examination not only 
difficult but. impracticable.. It is apprehended, however, that 
no fuch motion, or embarraffment, in the making of fuch ex- 
aminations, has ever been obferved.. 
What is aiai iaaa Fark that it is brighty- 
and vifible at a diftance, and this without fuel ; and that no 
part of the electrical fluid flies off, in fuch cafe, to diftant pla~- 
ces, byt all goes directly, and is to be found in the place, to 
which it is deftined, appears to favour the hypothefis ; as the 
implied inference feems to be, that the vifibility of the electric 
Apark gen o ait ae e paper aksie poasit 
.daític fluid. But if the foregoing queries furnith 1 
ent reafon for doubting the exiftence of foch a Gnid, or. r 
„doubting: fuch an effec from. it, fuppofing its exiftence, will 
.they not furnifh equal reafon for.doubting the hypothefis :? i 
The vifibility of the ele&ric {park may be accounted for, up- 
on the principles of the received doctrine concerning light, 
without fappoling any diminution of the' pure ele&ric fluid in 
"the fpark :- Bo" part, peer it is hid, scie = 
mentioned. diei 
"s 
