They were standing close by the screens which hid the stage and the actors. At the conclusion of Professor Jones's remark there came from behind the scenes a chuckle, followed an instant later by Roberta's characteristic and unmistakable titter. Christy looked hard at the screens, frowned, pulled out her purse and cheerfully paid a third admission. "I want to see if they do more than two plays," she explained, choosing a seat in the exact middle of the front row.