FIG. 2. Fix a wire in the lead, with which the bottom of the bottle is armed, (_d_) so as that bending upwards, its ring-end may be level with the top or ring-end of the wire in the cork (_e_), and at three or four inches distance. Then electricise the bottle, and place it on wax. If a cork suspended by a silk thread (_f_) hang between these two wires, it will play incessantly from one to the other, 'till the bottle is no longer electrised; that is, it fetches and carries fire from the top to the bottom of the bottle, 'till the equilibrium is restored. EXPERIMENT IV. FIG. 3. Place an electricised phial on wax; take a wire (_g_) in form of a C, the ends at such a distance when bent, as that the upper may touch the wire of the bottle, when the lower touches the bottom: stick the outer part on a stick of sealing wax (_h_) which will serve as a handle. Then apply the lower end to the bottom of the bottle, and gradually bring the upper-end near the wire in the cork. The consequence is, spark follows spark till the equilibrium is restored. Touch the top first, and on approaching the bottom with the other end, you have a constant stream of fire, from the wire entering the bottle. Touch the top and bottom together, and the equilibrium will soon be restored, but silently and imperceptibly; the crooked wire forming the communication. EXPERIMENT V. FIG. 4. Let a ring of thin lead or paper surround a bottle (_i_), even at some distance from or above the bottom. From that ring let a wire proceed up, 'till it touch the wire of the cork (_k_). A bottle so fixt cannot by any means be electrised: the equilibrium is never destroyed: for while the communication between the upper and lower parts of the bottle is continued by the outside wire, the fire only circulates: what is driven out at bottom, is constantly supply'd from the top. Hence a bottle cannot be electrised that is foul or moist on the outside. EXPERIMENT VI. Place a man on a cake of wax, and present him the wire of the electrified phial to touch, you standing on the floor, and holding it in your hand. As often as he touches it, he will be electrified _plus_; and any one standing on the floor may draw a spark from him. The fire in this experiment passes out of the wire into him; and at the same time out of your hand into the bottom of the bottle. EXPERIMENT VII. Give him the electrified phial to hold; and do you touch the wire; as often you touch it he will be electrified _minus_, and may draw a spark from any one standing on the floor. The fire now passes from the wire to you, and from him into the bottom of the bottle. EXPERIMENT VIII.