What are some examples of satire in chapters 12 and 13 of The Adventures of Huckleberry Finn?Please give at least 2 examples.

While Huck and Jim commence their adventurous journey on
the Mississippi River, the raft becomes a makeshift home as Jim forms a wigwam for them
to get out of the elements, placing a fire box outside.  In the night, Huck slips ashore
to buy some meal and bacon; sometimes he "lifts" a chicken, rationalizing that Pa always
said to take one

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when you get a chance because if you don't want
him yourself you can easy find somebody who does, and a good deed ain't ever
forgot.

In the morning, Huck
sneaks into corn fields and "borrows" a watermelon, a mushmelon, a pumpkin, or some new
corn, reasoning again that Pap has said it is no harm to borrow if you intend to pay
someone back.  However, since the widow has said that such acts are stealing, Jim feels
that both Pap and the widow have points, so the best thing to do is just to decide not
to borrow the same things all the time.  So, they have eliminated taking persimmons and
crabapples.  Huck narrates,

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We warn't feeling just right, before that, but
it was all comfortable now.  I was glad the way it come out ,too, because crabapples
ain't ever good, and the p'simmons wouldn't be ripe to two or three months
yet.

In this passage of
Chapter XII, Mark Twain satirizes the way in which people rationalize and justify their
wrongdoings.

In Chapter XIII, when Jim and Huck encounter a
wrecked steamboat, they find a skiff full of plunder and transfer this to the raft, but
think nothing of taking this because the "gang of murderers" have really stolen it. 
However, Huck does feel some obligation to find someone to rescue the men on the wrecked
boat.  So, he fabricates a story that his family is stranded on the Walter
Scott in order to convince the watchman to rescue the thieves.  Pip feels
"ruther comfortable" about what he has done because he believes that the widow would be
proud of him for helping the thieves

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because rapscallions and dead beats is the kind
the widow and good people takes the most interest
in.

Here Twain satirizes the
efforts of people to provide charity to people who are strangers and of little character
when they often neglect those in their own family or
neighborhoods.