MR. EDITOR,—It was with inexpressible concern that, in your paper of Wednesday last, I observed a letter signed “John Jackson,” purporting to be an answer to a supposed challenge from me, inserted in your detailed account of the recent pugilistic contest at Maidenhead. Mistake me not, Sir. I was not concerned at the contents of Mr. Jackson’s elegant effusion, nor in the least affected or surprised at the opprobrious falsity, brazen impudence, or malignant calumny of his assertions, which I deny _in toto_; but felt particularly hurt at the idea that I was compelled either to sit down tamely under injury, or incur the risk of offending my best friends, and particularly the respectable magistrates of this division, by resuming a profession which, both from principle and conviction, I had wholly relinquished. In order satisfactorily to refute Mr. Jackson’s allegations, it is only necessary to observe that a month after our battle at Hornchurch I waited on him, upbraided him with his unmanly conduct, by laying hold of my hair, and offered to fight him for 200 guineas. Jackson proposed to fight for 100 guineas; and upon that sum being procured, declined fighting under 500 guineas. Here was courage, here was consistency, here was bottom, and yet Mr. Jackson is a man of honour and of his word!!! Mr. Editor, after this I left London for five years, which may easily account to Mr. Jackson for the interval of silence. I have fought thirty-two pitched battles—four with Humphries (three of which I won), and two with Will Warr, in both of which I was victorious; these two men were both game, and good fighters, and of course, having received so many blows, my only motive for wishing again to fight Mr. Jackson must be that spirit of honour and retaliation ever inherent in the breast of man. Mr. Editor, I repeat that I am delicately situated. I wish to fight Mr. Jackson, and intend it; but that, from a dread of injuring my family, by offending the magistrates as a challenger in a newspaper (which would be indecorous in a publican), I can only observe, that I should be very happy to see, as soon as possible, either Mr. Jackson or his friends, at my house, where they shall receive every attention from me, as I wish most earnestly to convince the world what a deep and just sense I entertain of all Mr. Jackson’s favours conferred upon “Admiral Nelson,” Whitechapel. DANIEL MENDOZA.