He made a wild gesture as if to knock the old man’s hat off, called out something like “Catch me if you can,” and went racing away across the white, open Circus. Concealment was impossible now; and looking back over his shoulder, he could see the black figure of the old gentleman coming after him with long, swinging strides like a man winning a mile race. But the head upon that bounding body was still pale, grave and professional, like the head of a lecturer upon the body of a harlequin.