I know not why, but in that hour to-night,

Even as they gazed, a sudden tremor came,

And swept, as 't were, across their hearts' delight,

Like the wind o'er a harp-string, or a flame,

When one is shook in sound, and one in sight:

And thus some boding flashed through either frame,

And called from Juan's breast a faint low sigh,

While one new tear arose in Haidée's eye.