[ 7io ] 
3. When the Outfide of the Phial is perfectly 
dry. 
4. In proportion to the Number of Points of 
non-electric Contact. Thus if you hold the 
Phial only. with your Thumb and Finger, the 
Snap is finall; larger when you apply another 
Finger, and increafes in proportion to the Grafp 
of your whole Hand. 
5. When the Water in the Phial is heated ; 
which beins; then warmer than the circumam- 
bient Air, may not occafion the condenfing the 
floating Vapour therein upon the Surface of the 
Glafs. 
14. From thefe Confiderations it is to be ob- 
ferv'd, that this Effect arifes from electrifying the 
non-electric Water, included in the originally-electric 
Glafs ; lo that whatever tends to make the Outfide 
of the Glafs non-electric by wetting it, as, a rooift 
Hand, damp Air, or the Water from the infide of 
the Phial, defeats the Experiment, by preventing 
the requifite Accumulation of the electrical Power. 
iy. That a 'Gun-barrel is abfolutely neccflary to 
‘make this Experiment fucceed, is imaginary j a folid 
Piece of Metal of any Form is equally ufeful. Nor 
have I yet found, that the Stroke is in proportion 
to the Quantity of electrified Matter 5 having ob- 
ferved the Stroke from a Sword as violent as that 
from a Gun-barrel with feveral excited iron Bars * in 
Contact with it. 
16 . 
* If of fijc Men touching each other, and landing upon Originally- 
ele&rics, one touches the Gun-barrel, the whole are electrified ; all thefe 
then mult be confider’d, as fo much excited non-eleClric Matter. From 
the Aggregate of all thefe, not more Fire is vifible upon the Touch than 
from either of them fingly. 
