Montresor claims that his heart grew sick because of the dampness of the catacombs. Not because he murdered a person by entombing him behind a wall.
It gives the reader a notice about what the text it is a about. This could be to see if the reader of the text is interested in the text. Sub headings gives the reader a notice about what the reader will find in that part of the text.
Answer:
symbolical im pretty sure
