The Gift of the Magi

In the vestibule below was a letter-box into which no letter would go,
and an electric button from which no mortal finger could coax a ring.
Also appertaining thereunto was a card bearing the name "Mr. James Dillingham Young."

vestibule :　玄関
mortal :　人間の
no mortal finger could coax a ring :　人間の指ではどうにも呼び鈴を鳴らせそうにもない
coax :巧く扱う
appertaining thereunto :　その上に貼り付けてあるのは