What are examples of pathos in the story "The Last Leaf"?

Pathos is used when someone appeals to the audience's emotions to make an argument or otherwise persuade the audience. Drawing on people's emotions is a very effective way to make them care about something or someone, and O. Henry does this very well in "The Last Leaf." Because much of this story is about the young artist Johnsy and her very serious case of pneumonia, O. Henry needed to make people care about Johnsy and hope she can recover from her illness. One way O. Henry does this is through Sue, Johnsy's roommate and fellow young artist. When Johnsy says she is going to die when the last leaf on the ivy outside falls, Sue becomes very upset that her good friend has given up and does not even want to try to survive. Pathos is present here because seeing how much Johnsy's behavior and illness are hurting Sue make readers sad and nervous for Sue, too.