C 494 3 
ance; but then conjectur’d, that it muft arife from 
the Coldnefs of the Glafs, condenfinu the floating 
Vapour of the Room. In order then to obviate 
this, i warm’d the Tube fufficiently, and this Effect 
was no longer produc’d, but the Silver lay per- 
fectly (till. 
If a Number of Pieces of finely fpun Glafs, cut to 
about an Inch in Length, little Bits of fine Wire of 
the fame Length, of what Metal you pleafe, and 
fmall Cork-Balls, are either put all together, or each 
by themfelves, into a dry pewter Plate, or upon a 
Piece of polifhed Metal, they make, in the follow- 
ing Manner, a very odd and furprifing Appearance. 
Let a Man, handing upon electrical Cakes, hold this 
Plate in his Hand, with the Bits of Glafs, Wire, &c. 
detached from each other, as much as convenientlv 
may be; when he is electrified, let him caufe a Pcr- 
fon handing upon the Ground to bring another 
Plate, his Hand, or any other Non-electric, exactly 
over the Plate, containing thele Bodies. When his 
Hand, &c. is about eight Inches over them, let him 
bring it down gently : As it comes near, in propor- 
tion to the Strength of the Electricity, he will ob- 
ferve the Bits of Glafs firh raife themfelves upright ; 
and then, if he brings his Hand nearer, dart directly 
up, and flick to it without fnapping. The Bits of 
Wire will hy up likewife, and as they come near 
the Hand fnap aloud ; you feel a {mart Stroke, and 
fee the Fire arifing from them to the Hand at every 
Stroke: Each of thefe, as foon as they have dis- 
charged their Fire, falls down again upon the Plate. 
The Cork- Balls alfo fly up, and ftrike your Hand,' 
but fall again directly. You have a conftant Suc- 
ceflion of thefe Appearances, as long as you conti- 
6 nue 
