DEMON BOTTLE.
Cut a piece of pith of wood, or some equally light substance, into the shape of a small bottle, and at its base fasten the half of a small bullet (a, see figure). Down the centre of the bottle bore a hole, and fit the hole with a steel pin (a b). The bottle so made may be rendered obedient to the commands of its owner, who, when he wishes it to stand upright and resist the commands of the bystanders, will previously have removed the pin; when he wishes it to act in the contrary manner he will insert the pin, which will be found to counteract the weight of the bullet, and the bottle will obediently recline after receiving its owner's orders to do so; the owner of course then being careful to give such orders.