Sir:--The salary of five pounds per week, payable by you to me under our agreement, bearing date the twenty-first day of October, one thousand eight hundred and fifty-three, being in arrears and unpaid for more than five weeks last past, (though repeated applications have been made to you for payment thereof) and the amount now owing to me by you having been demanded, and default being made in payment of the same, and there being other breaches on your part, of the agreement made between us, I do hereby, in pursuance of the power or authority given to me by the said agreement, bearing date the twenty-first day of October, eighteen hundred and fifty-three, and of all other powers and authorities enabling me thereto, give you notice that I do hereby cancel the said agreement, bearing date as aforesaid, and also the agreement dated the sixteenth day of February, one thousand eight hundred and fifty-three, respectively made between you of the one part and myself of the other part, and do hereby declare that the said agreements, respectively, shall be, and become absolutely void on the giving of this notice to you; but without prejudice to my rights and remedies for the recovery of any money that may now be due to me, under or by virtue of the said agreement, or either of them. I am, sir, your obedient servant, ELIZABETH T. GREENFIELD. The piano forte which previously had been furnished Miss G., to practise upon, was taken from her. The Duchess of Sutherland, upon learning the fact, immediately directed her to select one from Broadwood's. Her grace, from whom good acts seem constantly to emanate, permitted her to choose one valued at sixty guineas. Arrangements being completed for a Concert at the Stafford House, the following announcement at the same time was made to the British public:-- 27 Margaret Street, Cavendish Square. The Black Swan, in appealing to the generosity of the British public, assures them that the primary object of her visit to Europe is, to accomplish herself in the science of music, which professional friends earnestly counsel her to pursue, and which she embraces _con amore_, with the confident hope that, by the exercise of her vocal faculties in a more cultured form, she may be able to achieve the great object of her life. She is sensible of the philanthropic spirit of the people of Great Britain, and feels confident that they will receive her appeal with that kindness and forbearance that ever characterizes them in the cause of true humanity. The Black Swan, therefore, has the honour of informing the nobility, gentry, and public, that she will shortly appear at a grand concert (the particulars of which will be announced) under distinguished patronage. ELIZABETH T. GREENFIELD. London, May, 1853.