_Philadelphia_, Nov. 21, 1848. This violent and vindictive, but characteristic manifesto, as may be supposed, did not help Mr. Forrest’s cause very materially, with quiet and well-judging people, but it probably found sympathy among heated partizans, and those who supposed the honor and glory of the country was at stake. Mr. Macready appears to have made up his mind at once to sue Forrest for a libel, and accordingly he issued the following:— CARD TO THE PUBLIC OF PHILADELPHIA. In a card published in the Public Ledger and other morning papers of this day, Mr. Forrest having avowed himself the author of the statements, which Mr. Macready has solemnly pledged his honor to be without the least foundation, Mr. Macready cannot be wanting in self-respect so far as to bandy words upon the subject, but as the circulation of such statements is manifestly calculated to prejudice Mr. Macready in the opinion of the American Public, and affect both his professional interests and his estimation in society, Mr. Macready respectfully requests the public to suspend their judgment upon the question, until the decision of a Legal Tribunal, before which he will immediately take measures to bring it, and before which he will prove his veracity, hitherto unquestioned, shall place the truth beyond doubt. Reluctant as he is to notice further Mr. Forrest’s Card, Mr. Macready has to observe, that when Mr. Forrest appeared at the Princess’s Theatre in London, he himself was absent some hundred miles from that city, and was ignorant of his engagement until after it had begun; that not one single notice on Mr. Forrest’s acting appeared in the Examiner during that engagement (as its files will prove.) Mr. Forster, the distinguished Editor, whom Mr. Macready has the honor to call his friend, having been confined to his bed with a rheumatic fever during the whole period, and some weeks before and after. For the other aspersions upon Mr. Macready, published in the Boston Mail, and now, as it is understood, avowed by Mr. Forrest, Mr. Macready will without delay appeal for legal redress. JONES’S HOTEL, Nov. 22d, 1848. Immediately after publishing the above, Mr. Macready committed to his counsel, Messrs. Reed & Meredith, of Philadelphia, authority to commence such legal proceedings as they might deem advisable: and, preparatory thereto, he obtained from England the documentary evidence. As regards the charge of suborning the English press, it will be sufficient here to refer to the Times, Globe, Observer, Spectator, Morning Chronicle, Morning Post, Weekly Dispatch, Britannia, &c., &c., of dates Dec. 13, 14, 15, 16, &c., which have indignantly and emphatically denied the charge; many of which denials have already been republished in the American newspapers.