"Well, it's large."

"But not large enough for—— Great Scott!"

Merry had placed the fly in the blank corner of the marked mirror, and everyone was astonished by its appearance.

"It's large as a humming bird!" shrilly hissed a boy. "My! but that's a corker!"

"That can't be a fly!" declared a man.

Then the amazing insect was seen to start to crawl across the face of the mirror.

"Here! here!" laughed Frank, gently catching it and restoring it to the blank place in the lower right-hand corner. "Don't be in a hurry to get to work."

"There is one amazing thing about this fly," he said, turning to smile on the audience. "It is never afraid of working overtime, and it really seems anxious to earn its salary."

The fly moved restlessly in the corner, starting several times as if to creep away, but turning back.

"It is a fly!" said a man's voice in the midst of the audience.