Becht and Master Kook, was very able, but the effect was lost in the prevailing enthusiasm for the Swan. The Monitor, Saturday Morning, Feb. 14, 1852. This celebrated vocalist, assisted by Prof. H. C. Becht, of Mentz, and Mast. Se. Emile Kook, will give one of her charming concerts at the Town Hall this (Sat.) evening, commencing at 8 o'clock. As this is the only opportunity for hearing the Black Swan, of whom so much has been written, the lovers of song will not fail to be present. The papers in almost every part of New York and New England, are filled with encomiums of the performances of this coloured Jenny Lind, (as she sings some of the best pieces, as sung by Jenny Lind and Catharine Hayes.) Don't fail of being present this evening. The Carpet Bag, Boston, Feb. 14, 1852. Some peoples' appetite for gammon is insatiable. Fancying they eat brawn, they often find themselves devouring cats and dogs. This was our thought on Tuesday night as we entered the Melodeon, with a fear that we might retire in disgust, as we had done on the previous evening from the exhibition of a clumsy mountebank who had undertaken to ape Macallister. But it was not the case on this occasion of the _début_ of Miss Greenfield, the 'Black Swan,' so absurdly cognominated. We say _absurdly_--for swans are never black, neither do they sing. Their modulations are any thing but melodious, and their inflections are absolute inflictions. But _n'importe_,--after a flourish or two upon that poorest of all _solo_ instruments, the piano-forte, by Mr. Perabeau, a most pleasing performer upon such imperfect machinery, the dark-faced girl presented herself, and was hailed with plaudits that might have gratified the ambition of the whitest among the queens of song. The auditors, who were brought thither mainly from a desire to ascertain whether such things as had been told could actually be, were at once satisfied on hearing but a few bars from Bishop's charming cavatina, "Sweetly o'er my Senses Stealing,"--that the 'Black Swan' was indeed a _rara avis in terris_.