"I will call again in the morning," said the medical man; "keep her in bed to-morrow, at all events till I have seen her."

When he left, Betty found herself able to ascend the stairs. She cast a frightened glance about her room. The straw hat, the grey dress were there. No one was in it.

She was helped to bed, and although laid in it with her head among the pillows, she could not sleep. Racking thoughts tortured her. What was the signification of that encounter? What of her strange sleeps? What of those mysterious appearances of herself, where she had not been? The theory that she had walked in her sleep was untenable. How was she to solve the riddle? That she was going out of her mind was no explanation.

Only towards morning did she doze off.

When Dr. Groves came, about eleven o'clock, Betty made a point of speaking to him alone, which was what she greatly desired.

She said to him: "Oh! it has been worse this last occasion, far worse than before. I do not walk in my sleep. Whilst I am buried in slumber, someone else takes my place."

"Whom do you mean? Surely not one of the maids?"

"Oh, no. I met her on the stairs last night, that is what made me faint."

"Whom did you meet?"

"Myself—my double."