Jack had taken himself off.

Not a sign of him was to be seen, when she bent over the railing of the corridor, and looked down on the stairs.
She locked herself in again.

"I hope I haven't offended him!" she thought, as she returned to the empty medicine-chest.
The fear that Jack might talk of what had happened to him in the laboratory at Wurzburg, and that he might allude to his illness in terms which could not fail to recall the symptoms of Mr.Keller's illness, was constantly present to her mind.

She decided on agreeably surprising him by a little present, which might help her to win his confidence and to acquire some influence over him.

As a madman lately released from Bedlam, it might perhaps not greatly matter what he said.