In which he discusses a medicinal plant

This is Jewel Weed.  It is the best cure for the itching of bug bites and poison ivy.  It can usually be found near a creek.  Just pick the leaves and boil it in water like a tea (don’t drink it).  Allow it to cool and pour it into ice cube trays.  After freezing you can apply the cubes to the irritated area of skin.  It really works. 

(wikipedia info)