At that the English girl laughs scornfully.

"Really, I did not think men could be so easily deceived, and one whom I considered as shrewd as you, Doctor Chicago. See what a miserable deception, a fraud transferred from the boards of a New York theater to Algiers. Behold! the magic wand touches age with a gentle touch, and what follows?"

Lady Ruth is standing between the two, and within arm's length of either.

The Sister has not moved, but, as if confident of influencing John, holds her own. She shoots daggers with her eyes at the English girl, but looks cannot hurt.

As Lady Ruth utters her last words, she makes a sudden move.

With a dexterous fling of an arm she succeeds in tearing from the Sister's face the cleverly-made thin stage mask that was contrived to conceal the features of one who did a double act.

The professor laughs.

From the crowd that is still gathering various sounds arise, for no one can even give a guess as to the nature of the peculiar trick which is thus being enacted.

As for John Craig, he holds his breath at the stupendous nature of the disclosure, for little as he has dreamed of the fact, he sees before him the well-known features of Pauline Potter.

This queen of the stage has made even another attempt to get John, and might have succeeded only for the opportune coming of his friends.