According to the narrator, what sill attracts tourists' attention at McDougal's cave years after Injun Joe's death?
What still attracts the tourists even though it has been years since Injun Joe's death is the dripping water. This is the drip from which Injun Joe got some little bit of water as he tried to keep from dying.
By saying this, I think Twain is trying to get us to think about how morbid people are. He says they like to look at the drip and think about how Joe lay there dying. This makes it an attraction more popular than the more beautiful things elsewhere in the cave. It just shows how people are attracted to death and horror.
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