Traveling to areas with known plague?
Make sure that you are properly protected using this Receipt against the Plague. Truly an unexpected find. Camphor is known to be used as a natural mosquito repellant, so perhaps there’s validity in this recipe if the ointment is effective in repelling fleas as well?
Love the story about the four malefactors (who robbed the infested houses).
Source: The Art of Cookery Made Plain and Easy, 1747.