Several mishnayot. Beginning with more on fire, if it crossed a public road, a river, a wall - barriers that usually prevent the spread of fire. With a delving into issues of the wall. Plus, recognizing different kinds of fire. Also, fire set on another's property. And what about if that fire destroys things that were hidden, such that the fire-setter wouldn't have known to expect them to be there? It's a machloket if he has to pay.