Misc: What do we call the jagged tops of castle walls through which archers could fire?

Questions

Literature - In 'A Christmas Carol', how many ghosts visited Scrooge?

Literature - In 'A Christmas Carol', what was the name of the miser?

Literature - In 'Alice In Wonderland', who never stopped sobbing?

Literature - In 'Romeo and Juliet', about what was Mercutio's long monologue?

Literature - In 'Romeo and Juliet', who gave a long monologue about Queen Mab?