Not until the ‘Tu pulchra es’ did she display the full power of her art.

From the commencement she took part in the execution of this magnificent composition eagerly and with deep feeling, and when the closing bars began and the magic of her singing developed all its heart-thrilling power, the watchful lady in waiting perceived that his Majesty forgot the food and hung on Barbara’s lips as though spellbound.

This was something unprecedented. But when the monarch continued for some time to display an abstemiousness so unlike him, the marquise cast a hasty glance of inquiry at Malfalconnet. But the affirmative answer which she expected did not come. Had the baron’s keen eye failed to notice so important a matter, or had his Majesty taken him into his confidence and commanded him to keep the secret?

That Malfalconnet was merely avoiding making common cause with the old intriguer, was a suspicion which vanity led her to reject the more positively the more frequently her countryman sought her to learn what he desired to know.

Besides, she soon required no further confirmation, for what now happened put an end to every doubt.

Barbara had to sing the “Quia amore langueo” again, and how it sounded this time to the listening hearer!

No voice which the Emperor Charles had ever heard had put such pure, bewitching melody into this expression of the deepest yearning. It seemed as though the longing of the whole world was flowing to him from those fresh, young, beautifully formed red lips.

A heart which was not itself languishing for love could not pour forth to another with such convincing truth, overwhelming power, and glowing fervour the ardent longing of a soul seized by the omnipotence of love.

The mighty pressure of rising surges of yearning dashed against the monarch’s heart, and with tremendous impetuosity roused on all sides the tender desires which for a long time had been gathering in his soul. It seemed as though this “Because I long for love” was blending with the long-repressed and now uncontrollable yearning that filled his own breast, and he was obliged to restrain himself in order not to rush toward this gifted singer, this marvellously lovely woman, whose heart was his, and, before the eyes of all, clasp her in his embrace.

The master of dissimulation forgot himself, and—what a delight to the eyes of the marquise!—the Emperor Charles, the great epicure and thirsty drinker, left the pasty and the wine, to listen standing, with hands resting on the table and outstretched head, to Barbara’s voice.