Alexander Mackay Junior’s gray slate gravestone in the Granary Burying Ground at Boston displays a skull with the lower jaw missing, teeth nearly chewing on crossed bones. This symbol, like many found in cemeteries in the 17^th and 18^th Century are meant to remind passersby that life is short and that all will die.  These grim images are called Memento Mori symbols.  Memento Mori is Latin which translates to “remember death“.