A lamp burning on the table on which the phial was placed, kept that terrible object constantly before her, and seemed to prompt her to have recourse to it.

Being long past midnight, it was to be supposed that all the inmates of the mansion, except herself, were buried in slumber, but the restless woman felt sure she heard footsteps in the gallery outside.

Who could be there at that hour? She was not left long in doubt. A tap was heard at the door, and to her inquiry who was there, a voice answered, “Rose.”

Everything alarmed her now, and even this visit terrified her.

But after a moment's delay, she opened the door, and saw Rose in a robe de chambre belonging to one of the young ladies, and holding a taper in her hand.

“Pardon me for disturbing you, madam,” she said. “But Miss Calverley has been taken suddenly ill, and is very faint, and Miss Barfleur has sent me to you for some sal-volatile, or some other stimulant, to revive her.”

On hearing this, an infernal idea crossed Teresa.

“Give her three or four drops of eau de luce from this phial,” said Teresa, giving her the poison. “I have just taken that quantity myself, for I have not felt well to-night. Not more than four drops, mind. Be very particular. And when you have given her the dose, bring back the phial to me.”

“Won't you give it to her yourself, ma'am?” said Rose.

“No; I would rather not leave my room,” replied Teresa. “Lose no time.”