• For whatsoever is so tyed, or environed, as it cannot move, but within a certain space, which space is determined by the opposition of some externall body, we say it hath not Liberty to go further. And so all living creatures, whilest they are imprisoned, or restrained with walls, or chains; and of the water whilest it is kept in by banks, or vessels, that otherwise would spread it selfe into a larger space, we use to say, they are not at Liberty, to move in such manner as without those externall impediments they would.