Questions:

1.what does the Jackdaw call the "Third Joke"?

  The Bears wanted to prove Uncle Andrew was not a animal ,so he rose to his hind legs, took a step backwards,but unfortunately he  tripped over a low branch and fell flat on his back. That's the third joke.

2.In this chapter Aslan calls a council to discuss the safety of Narnia, and he warns the creatures that "an evil has already entered it." 

 Yes ,that is ture.

3.What does Aslan ask Digory to do in front of the council of Beasts? 

 Answer the questions :how the evil Witch entered this new world and so on.

4.From his conversation with Aslan does it seem like the enchanted writing in Charn forced Digory to ring the bell and wake up Jadis? 

   No,though this conversation we knew Digory was just pretended with the writing.

@TS 12,sister,love you .