Preservatives against the plague, or, Directions & advertisements for this time of pestilential contagion : with certain instructions for the poorer sort of people when they shall be visited and also a caveat to those that were about their necks impoisoned amulets as a preservative against that sickness : published in the behoofe of the city of London, now visited, and all other parts of the land that may or shall hereafter be visited /