The young singer now went to Paris accompanied by Baroness Leuhusen, and began a course of lessons under Wartel. She so profited by his instruction, that she made her debut at the Theatre Lyrique on October 27, 1864, as Violetta in "La Traviata," and afterwards appeared as Lady Henrietta, Astrofiammante, Elvira ("Don Giovanni"), etc. She remained at the Theatre Lyrique nearly three years, after which she went to England and sang at Her Majesty's, making her first appearance as Violetta, on June 8, 1867. Notwithstanding that Patti had the world at her feet, the success of Nilsson was extremely brilliant, her impersonation of Marguerite in "Faust" calling forth unstinted praise, and it is the opinion of many that in that part she has never been excelled. Her representation of Marguerite was that of a quiet, simple girl, full of maidenly reserve during the first three acts, a deep-natured young girl, restrained from the full expression of her feelings by every instinct of her better nature, and every rule of her daily life. This very forbearance of style made her final surrender a thousand times more impressive than is usual. It was accomplished in one wild, unlooked-for rush of sudden emotion, caused by the unexpected return of her lover. The picture which Nilsson gave of this tender, gentle girl, in the pensive, anxious joy of her first love, and in the despair and misery of her darkened life, was one over which painters and poets might well go wild with enthusiasm. Nilsson had a voice of wonderful sweetness and beauty, and possessed the most thorough skill in vocalization. She could reach with ease F in alt, and showed to advantage in such operas as "Zauberfloete." Her singing was cold, clever, and shrewd, and she calculated her effects so well, that her audience was impressed by the semblance of her being deeply moved. The eulogies of London and Paris dwelt more upon her acting than upon her singing, more upon her infusion of her own individuality into Marguerite, Lucia, and Ophelia than upon any merely vocal achievement. She was considered a dramatic artist of the finest intuitions, the most magnetic presence, and the rarest expressive powers. There was, too, a refinement, a completeness, and an imaginative quality in her acting, which was altogether unique. [Illustration: _Nilsson as Valentine._] From 1870 to the spring of 1872 Miss Nilsson was in America, where she met with a perfect ovation. In 1872 she returned to London, and in July was married by Dean Stanley, in Westminster Abbey, to M. Auguste Rouzeaud, of Paris. She visited America again in the season of 1873-4. In 1881, Nilsson sang in opera for the last time, but continued to sing in oratorio and concerts until 1888, since which time she has remained in the seclusion of private life.