"Will you take the chance I spoke of?"

"For goodness' sake," said Sara Lee in an exasperated tone, "how can I tell you until I know what it is?"

Henri told her. He even, standing under a street lamp, drew a small sketch for her, to make it clear. Sara Lee stood close, watching him, and some of the lines were not as steady as they might have been. And in the midst of it he suddenly stopped.

"Do you know what it means?" he demanded.

"Yes, of course."

"And you know what date this is?"

"The eighteenth of February."

But he saw, after all, that she did not entirely understand.

"To-night, this eighteenth of February, the Germans commence a blockade of this coast. No vessels, if they can prevent them, will leave the harbors; or if they do, none shall reach the other side!"

"Oh!" said Sara Lee blankly.