Mario, who continued to sing the _duo concertante_ in "Don Pasquale," as none others could. They were still the "rose and nightingale" whom Heine immortalizes in his "Lutetia," "the rose the nightingale among flowers, the nightingale the rose among birds." That airy dilettante, N. P. Willis, in his "Pencilings by the Way," passes Grisi by with faint praise, but the ardent admiration of Heine could well compensate her wounded vanity, if, indeed, she felt the blunt arrow-point of the American traveler. A visit to St. Petersburg in 1851, in company with Mario, was the occasion of a vast amount of enthusiasm among the music-loving Russians. During her performance in "Lucrezia Borgia," on her benefit night, she was recalled twenty times, and presented by the Czar with a magnificent Cashmere shawl worth four thousand rubles, a tiara of diamonds and pearls, and a ring of great value. From the year 1834, when she first appeared in London, till 1861, when she finally retired, Grisi missed but one season in London, and but three in Paris. Her splendid physique enabled her to endure the exhaustive wear and friction of an operatic life with but little deterioration of her powers. When she made her artistic tour through the United States with Mario in 1854, her voice had perhaps begun to show some slight indication of decadence, but her powers were of still mature and mellow splendor. Prior to crossing the ocean a series of "farewell performances" was given. The operas in which she appeared included "Norma," "Lucrezia Borgia," "Don Pasquale," "Gli Ugonotti," "La Favorita." The first was "Norma," Mme. Grisi performing _Norma_; Mlle. Maria, _Adalgiza_; Tamberlik, _Pollio_; and La-blache, _Oroveso_; the last performance consisted of the first act of "Norma," and the three first acts of "Gli Ugonotti," in which Mario sustained the principal tenor part. "Rarely, in her best days," said one critic, "had Grisi been heard with greater effect, and never were her talents as an actress more conspicuously displayed." At the conclusion of the performance the departing singer received an ovation. Bouquets were flung in profusion, vociferous applause rang through the theatre, and when she reappeared the whole house rose. The emotion which was evinced by her admirers was evidently shared by herself.