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Rh drew back in a state of great agitation and embarrassment. Evidently a suspicion had just crossed the mind of this old and attached servant as to whom the Yellow Domino might be."

"Well, well," cried the doctor, "go on; let us hear the rest."

"I—I have nothing more to say," mumbled the man, while Hartley, with an equal display of embarrassment, motioned the discomfited servant to withdraw, and turned as if to hide his face over some papers on the table.

"I think the man in the yellow domino had better be found," quoth the physician, dryly, glancing from Hartley to the departing form of the servant, with a sharp look. "At all events it would be well enough for us to know who he is."

"I don't see—" began Uncle Joe, but stopped as he perceived the face of Hartley Benson slowly composing itself. Evidently he was as much interested as myself in observing what this not-easily-to-be-understood man would say and do in this sudden crisis.

We were not long left in doubt.