One magnet may consociate with itself in order several pieces of iron, and may inclose all within one and the same sphere. For if from two spheres, i.e. of the magnet and of the iron, there arises a larger which incloses the magnet and the iron, and which penetrates the iron, conjoins and allures it to itself, then it follows, that from several spheres may be formed one larger, and thus that innumerable pieces of iron may be mutually joined together, and made to follow the same magnet, as if tied and bound to it.