George Washington's Rules of Civility Traced to their Sources and Restored by Moncure D. Conway
Chapter ii. 18. Pour l'ordre que l'on doit tenir étant assis, c'est
de placer bien ses pieds à terre en égale distance que les cuisses, non pas de croiser vne cuisse ou vn pied sur l'autre.
When seated, the feet should be placed well on the ground, in even distance with the legs, and neither a leg or a foot should be crossed on the other.
11th. Shift not yourself in the Sight of others nor Gnaw your nails.