Rules to be observed by masters and pilots of vessels, arriving at the port of Philadelphia, established by the health law, and regulations of the Board of Health, to which is annexed, a supplement to the health law, passed on the 2d day of April, 1821.

"Rules to be observed by masters and pilots of vessels, arriving at the port of Philadelphia" by the Philadelphia Board of Health, is a set of early 19th-century health regulations intended to keep Philadelphians safe from contagious diseases. As ships arrive in Philadelphia, captains and pilots have to follow health inspections. They are told where to anchor and how to get their cargo and passengers checked out. There are punishments, such as fines, for ship leaders if they do not comply with the rules or if they lie. The book also includes guidelines for specific times of the year that were added to the health laws, showing how important it was to keep the port city healthy.