Rex, who had no partisanship with the Israelites, having made a troublesome acquaintance with the minutiae of their ancient history in the form of "cram," was amusing himself by playfully exaggerating the notion of each speaker, while Anna begged them all to understand that he was only joking, when the laughter was interrupted by the bringing in of a letter for Mrs. Davilow. 
Rex was amusing himself by playfully exaggerating the notion of each speaker, when the laughter was interrupted by the bringing in of a letter for Mrs. Davilow. 