Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Depiction of Christopher Marshal and his two sons, Charles and Christopher, Jr., in the apothecary shop he founded in 1729 in Philadelphia, Pennsylvania.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)