From the cieling, or any convenient part of a room, let two
cork-balls, each about the bigness of a small pea, be suspended by
linen threads of eight or nine inches in length, so as to be in
contact with each other. Bring the excited glass tube under the
balls, and they will be separated by it, when held at the distance
of three or four feet; let it be brought nearer, and they will stand
farther apart; entirely withdraw it, and they will immediately come
together. This experiment may be made with very small brass balls
hung by silver wire; and will succeed as well with sealing-wax made
electrical, as with glass.