But alas! when she reached the Grand Châtelet, the lovely star, whereof our unknown had made himself the satellite, was suddenly eclipsed: the wicket of the royal prison opened the instant that the duenna knocked, and closed again behind them. The young man was taken aback for a moment; but as he was a very decided fellow when there was no pretty girl at hand to weaken his resolution, he very soon made up his mind what course to pursue. A sergeant, pike on shoulder, was walking sedately back and forth before the door of the Châtelet. Our youthful unknown followed the example of the worthy sentinel, and, having walked on a short distance to avoid observation, but not so far as to lose sight of the door, he heroically began his amorous sentry-go. If the reader has ever done sentry duty in the course of his life, he must have noticed that one of the surest means of making the time pass quickly is to commune with one's self. Our hero doubtless was accustomed to such duty, for he had hardly begun his promenade when he addressed the following monologue to himself:-- "Assuredly it cannot be that she lives in yonder prison. This morning after mass, and these last two Sundays when I dared not follow her save with my eyes,--dullard that I was!--she turned not to the right upon the quay, but to the left, toward the Porte de Nesle, and the Pré-aux-Cleres. What the devil brings her to the Châtelet? What can it be? To see a prisoner, perhaps, her brother 't is most like. Poor girl! she must suffer cruelly, for doubtless she is as sweet and kind as she is lovely. Pardieu! I'm sorely tempted to accost her, ask her frankly who it is, and offer my services. If it be her brother, I'll tell the patron the whole story, and ask his advice. When one has escaped from the Castle of San Angelo, as he has, one has a shrewd idea of the best way to get out of prison. There's no more to be said: I'll save her brother. After I have rendered him such a service, he'll be my friend for life and death. Of course he'll ask me then what he can do for me when I have done so much for him. Then I'll confess that I love his sister. He'll present me to her, and then we'll see if she won't raise her eyes." Once launched upon such a course, we need not say how a lover's thoughts flow on unchecked. Thus it was that our youth was vastly amazed to hear the clock strike four, and see the sentinel relieved. The new sergeant began his promenade, and the young man resumed his. His method of passing time had succeeded too well for him not to continue to make use of it; so he resumed his discourse upon a theme no less fruitful of ideas than the other:--