Norbert did not make the dose strong enough.

The Duke is as strong as a horse; but it is all right, for should he live, he will be an idiot, and so our end is as much gained as if he had died." "But why does not Norbert write to me ?" asked Diana seriously.
"Why, because he has some faint glimmerings of common sense.

How do you know that he may not have half a dozen spies about him?
You must wait." Diana and the Counsellor waited for a week, but Norbert made no sign.
Diana suffered agonies, and the days seemed to pass with leaden feet.
Sunday came at last.

The Marchioness de Laurebourg had attended early Mass, and had given orders that her daughter should go to high Mass under the escort of her maid.

Diana was highly pleased with this arrangement, for she hoped to have a chance of seeing Norbert, but she was disappointed.