“He who truly loves,” she said coldly, as she recovered her equanimity, “would make even that sacrifice! and now listen—Fernand,” she continued, her eyes flashing fire, and her naked bosom heaving convulsively as she spoke, while her splendid form was drawn up to its full height, and her whole aspect sublimely terrible and wondrously beautiful, even in that fit of agitated passion—“listen, Fernand!” she cried, in her musical, flute-like voice, which, however, assumed the imperious accent and tone of command: “thou art a coward, and unworthy such an earnest—such a profound, such a devoted love as mine, if thou refusest to consummate a sacrifice which will make us both powerful and great as long as we live! Consider, my Fernand—the spirit with whom thou wouldst league thyself can endow us with an existence running over centuries to come, can invest us with eternal youth, can place countless treasures at our disposal, can elevate us to the proudest thrones of Christendom! Oh! wilt thou spurn advantages like those? wilt thou refuse to avail thyself of gifts that must render us so supremely happy? No, no: and we can return together to my native city, we can enter Florence in triumph, thou no longer fearing the terror of the law, I no longer compelled to simulate the doom of the deaf and dumb! Our enemies shall lick the dust at our feet, and we shall triumph wherever success may be desirable. Oh! I understand that beseeching, appealing look, Fernand: thou thinkest that I shall love thee less if this immense sacrifice be consummated, that I shall look upon thee with loathing. No, not so: and to convince thee that mine is a soul endowed with an iron will, that mine is an energy which can grapple even with remorse, I will reveal to thee a secret which thou hast perhaps never even suspected. Fernand!” she exclaimed, now becoming absolutely terrible with the excitement that animated her; “Fernand!” she repeated, “’twas I who murdered the girl Agnes, in the garden of thy mansion at Florence!”

“Thou, thou, Nisida?” almost shrieked Wagner wildly; “oh, no, no! Recall that dreadful avowal! And yet—oh! yes—I see it all—my former suspicions are confirmed. Wretched woman. What harm did the unfortunate Agnes do to thee?”

“I saw in her a rival, Fernand—or fancied that she was so,” answered Nisida; “I overheard your conversation with her that morning in the garden—I saw her embrace thee tenderly—mine ears drank in her words; oh, I remember them even now! She said, ‘Oh, what a night of uneasiness have I passed! But at length thou art restored to me; thou whom I have ever loved so fondly; although I abandoned thee for so long a time!’ Were not those her very words? And thou didst speak to her in a tone equally tender. Ah! I have ever suspected that she was thy mistress; although thou didst swear upon the cross, in thy dungeon, that she was not. But so great was my love for thee, that I smothered the dread suspicion——”

“Suspicion,” repeated Wagner, in the penetrating tone of heart-rending anguish,—an anguish so intense that his brain whirled, and he knew not what he said or did. “Oh, wretched woman, and thou didst slay Agnes on a mere suspicion?”

“I hated her—even before I entertained that suspicion,” exclaimed Nisida, impatiently; “for she was the mistress of my father! Thinkest thou that my quick ears had not gleaned the mysterious whisperings which frequently passed between my sire and his valet Antonio, relative to the lady who dwelt in seclusion at the abode of that menial’s mother? or thinkest thou that when I once obtained a clew to my father’s degrading passion, I scrupled to watch him, to follow him, to learn all his proceedings? No; for it was the more easily to enact the spy upon my own father that originally simulated the doom of the deaf and dumb. A purse of gold induced Dame Margaretha, Antonio’s mother, to give me admission into her house; though she also believed that I was really deprived of the faculties of hearing and of speech. But often and often was I concealed in the chamber adjacent to that where my father passed hours with his mistress; and it was not without advantage that I so acted. For I discovered that amongst the presents which he had given her, were the jewels which had belonged to my sainted mother—that mother whose wrongs were so manifold, and whose sufferings were so great. Yes: and I possessed myself of those jewels, leaving the girl the other gifts which she had received from my sire.

“And now, since I am involved in relations of such import, I shall do well to inform thee, Fernand, that I had seen and loved thee before thou didst come as a visitor to our mansion in Florence. For it was my habit to proceed occasionally to the dwelling of the good Dr. Duras, the depositary of my grand secret of the feigned loss of faculties; and while wandering alone in his garden I once beheld thee! And the moment I beheld I loved thee. Often—often after that would I visit the kind physician’s grounds, whereof I possessed a pass-key; and my admiration of thee led me to pass the slight boundary which separated his garden from thine. Then I would approach the windows of thy dwelling and contemplate thee as thou wast seated in thy favorite apartment. On the night of my father’s funeral, although so very late when all the subsequent business connected with the reading of the will was concluded, my mind was so perturbed and restless that I could not sleep; and quitting the Riverola mansion by a private door, I sought the fresh air with the hope that it would calm me. Some vague and indescribable sentiment of curiosity, or else something that I heard on the return of the mourners, relative to the strange scene enacted in the church, I know not which, led me to the vicinity of your abode; and there, in your favorite room, I beheld you seated, listening attentively to some sweet words, doubtless, which Agnes was breathing into your ear. But she caught a glimpse of my countenance by the light of the lamps——”

“Enough! enough!” exclaimed Wagner; “thou hast indeed cleared up innumerable mysteries! But, oh! Nisida—would that thou hadst remained silent—that thou hadst not drawn aside the veil which my elevated opinion of thee had thrown over the suspicions that, I admit, from time to time——”

“And if I have told thee all this, Fernand,” interrupted Nisida, impatiently, “it is that thou may’st be convinced not only of the natural energy of my mind, but also of the deep love which I bear thee. And now, now that thou seest me in my true character, a murderess if thou wilt,” she added with an emphasis of bitter scorn, “now canst thou refuse that sacrifice——”

“Nisida! Nisida! enough crime has been perpetrated by both us, Heaven knows!” ejaculated Wagner, still writhing with the anguish produced by the avowal which had so lately met his ears. “Oh! accursed be the day, blotted from the annals of Time be the hour, Nisida, when thy hand struck the fatal dagger into the heart of Agnes.”

“What! this to my face?” said Nisida, her countenance becoming crimson with indignation, and not her face only, but her swan-like neck, her shoulders, and her bosom. “Then she was thy mistress, Fernand! And thou didst love her, while I fancied, false one that thou art, thine affections to be wholly and solely mine.”