What surprising news did Atticus tell Jem about the jury in the Robinson case?

Jem thinks that the jury decided quickly, but Atticus reminds him that it took a few hours, which is much longer than usual. Typically, a case like Tom's would be settled in a matter of minutes. Atticus sees this as a sign of the beginnings of change for the better. Also, Atticus reveals that he learned that the one jury member who kept everyone out so long was a Cunningham who defended Tom's innocence. Atticus thinks that all Cunninghams will stand solidly behind anyone who wins their respect, without fail - and the incident at the jailhouse won the Finch family great respect.