George Washington's Rules: #5

Rule Number 5:

5th	If You Cough, Sneeze, Sigh, or Yawn, do it not Loud but Privately; and Speak not in your Yawning, but put Your handkerchief or Hand before your face and turn aside.

In other words:

5th	If  you need to cough, sneeze, sigh, or yawn, do quietly, to yourself; and if you need to yawn, don't talk at the same time, but put Your handkerchief or Hand before your face and turn aside.