of the hoops,
a glass bubble blown very thin and light. On electrifying the hoops,
the bubbles will be immediately attracted by them, and will continue
to move round the hoops as long as the electrification continues. If
the electricity be very strong, the bubbles will frequently be driven
off, run hither and thither on the plate, making a variety of
surprising motions round their axis; after which they will return to
the hoop, and circulate as before; and if the room be darkened, they
will all appear beautifully illuminated with electric light.

_The Electric Ball._

Provide a ball of cork about three-quarters of an inch in diameter,
hollowed out in the internal part by cutting it in two hemispheres,
scooping out the inside, and then joining them together with paste.
Having attached this to a silk thread between three and four feet in
length, suspend it in such a manner that it may just touch the knob of
an electric jar, the outside of which communicates with the ground. On
the first contact it will be repelled to a considerable distance, and
after making several vibrations, will remain stationary; but if a
candle be placed at some distance behind it, so that the ball may be
between it and the bottle, the ball will instantly begin to move, and
will turn round the knob of the jar, moving in a kind of ellipsis as
long as there is any electricity in the bottle. This experiment is
very striking, though the motions are far from being regular; but it
is remarkable that they always affect the elliptical rather than the
circular form.

_To spin Sealing-wax into Threads by Electricity._

Stick a small piece of sealing-wax on the end of a wire, and set fire
to it. Then put an electrical machine in motion, and present the wax
just blown out at the distance of some inches from the prime
conductor. A number of extremely fine filaments will immediately dart
from the sealing-wax to the conductor, on which they will be condensed
into a kind of net-work resembling wool.

If the wire with the sealing-wax be stuck into one of the holes of the
conductor, and a piece of paper be presented at a moderate distance
from the wax, just after it has been ignited, on setting the machine
in motion, a net-work of wax will be formed on the paper. The same
effect, but in a slighter degree, will be produced, if the paper be
briskly rubbed with a piece of elastic gum, and the melting
sealing-wax be held pretty near the paper immediately after