What do Huck and Jim discover on the raft? How do they react?

Huck and Jim go out on the river at night to pick up drifting logs and other objects that happen to float downstream. One night, they capture a large raft which they will later use to navigate the river after they leave the island. Later on, they see a whole house floating downstream and climb into it to salvage some of the goods. Jim finds Huck's Pap lying dead on the floor of the house, but refuses to let Huck see the man's face and does not reveal that it is Pap. Jim sees Pap was shot in the back while obviously attempting to rob the house.