Much has been said and written of this personage since she was introduced to the public as a musical prodigy. All sorts of surmises and conjectures have been indulged in, respecting the claim put forth of her merit, and generally the impression seemed to prevail that the novelty of "colour" and idle curiosity, accounted more for the excitement raised, than her musical powers. Well, she has visited our place, and given our citizens an opportunity of judging for themselves. We are ignorant of music, and unqualified to criticise, but a large audience were in attendance at Ringueberg Hall last evening--among those present were our musical amateurs--and we heard but one expression in regard to the new vocalist, and that was, wonder and astonishment at the extraordinary power and compass of her voice, and the ease with which she passed from the highest to the lowest notes seemed without an effort. Her first notes of "Where are now the hopes?" startled the whole audience, and the interchange of glances succeeded by thunders of applause, at the end of the first verse, showed that her success was complete. She was loudly encored, and in response sung the barytone, "When stars are in the quiet sky," which took down the whole house. We have neither time nor space to follow her through her different pieces. Suffice it to say, that there never was a concert given in this town, which appeared to give more general satisfaction, and every person we met on leaving the hall, expressed their entire approbation of her performance. No higher compliment could be paid to the "Swan," than the enthusiastic applause which successfully greeted her appearance, and the encore which followed her several pieces. There was a very general expression among the audience, that the sable vocalist should give another concert, and, at the earnest solicitation of several of our citizens, Col. Wood, her gentlemanly manager, has consented to give another entertainment to-morrow evening, when the "Black Swan" will give a new programme, consisting of some of Jenny Lind's most popular songs. The concert on Thursday evening, was what in other cases would have been called a triumph. The house was full--the audience a fashionable one--the applause decided, and the impression made by the singer highly favourable. We can safely say that Miss Greenfield possesses a voice of remarkable qualities; singular for its power, softness and depth. Of all this she gave ample evidence in the twelve or more pieces she sang--a feat in itself giving evidence of great vocal resources. There is a lack of training perceptible, although the Swan sings with great correctness, and evident close regard of the notes upon the music sheet. No one can hear her without acknowledging her talents--if that is the right expression--but what is to come of this we are not advised. A couple of years' severe training is indispensable, before she can safely be put before the public on a sure footing. Again: