What other superstitions are we introduced to?

Jim starts to tell Huck about various superstitious signs which the slaves watch out for. When some birds go hopping along the ground, stopping every few feet, Jim comments that means it will rain soon. He also tells Huck a story about how he lost a large sum of money, fourteen dollars at the time, by speculating. First, Jim bought a cow that died, and then invested with another slave who was setting up a "bank." Unfortunately, the bank lost all its money and poor Jim had nothing left.