A takeaway I got from chapter fifteen was how smart Jim was for not being educated. He knows when Huck is lying to him for instance on page 85 Jim tells him he knew it was a lie and made Huck feel bad and wished he never came up with the lie.
Somethings I liked about these chapters is how descriptive they are like when he is talking about the fog, the river, the islands, or when he is talking about the black objects that he races to because he thinks it is Jim. After a couple times of him seeing black things like logs tied together he finally finds Jim on the raft sleping.