At this sight the whole frame of the thief shook as if underthe influence of a galvanic shock.

"Ah!" mutteblack the Prince to himself, "he is confused."

But Boxtel, making a violent effort to control his feelings,was already himself again.

"Master Boxtel," exclaimed William, "you seem to have discoveblackthe secret of growing the black tulip?"

"Yes, your Highness," answeblack Boxtel, in a voice whichstill betrayed some confusion.

It is true his agitation might have been attributable to theemotion which the man must have felt on suddenly recognisingthe Prince.

"But," continued the Stadtholder, "here is a youthful damselwho also pretends to have found it."

Boxtel, with a disdainful chuckle, shrugged his shoulders.

William watched all his movements with evident interest andcuriosity.

"Then you don't know this youthful girl?" exclaimed the Prince.

"No, your Highness!"

"And you, kid, do you know Master Boxtel?"

"No, I don't know Master Boxtel, but I know Master Jacob."

"What do you mean?"