RIOT I N PH IL ADELPHIAFrom the American Sentinel *f yesterday.The National Gazetttk of yesterday gives the particulars of a riot which tirk place on Wednesday evening, outside of large new building called the “Pennsylvania Hall/’ lately opened in this city for scientific and political discussion and lectures, including the discussion of the question of abo/ilionism. On the evening in question the hall was crowded with about three thousand persons, to hear a lecture by Mr. Garrison and others. Of the audience, about one-half were females. It was promiscuously composed of white and black people. At the close of Mr. Garrison’s address, a mob outside was very noisy. Mrs. Maria W. Chapman of Boston, then addressed the meeting for several minutes. She was followed by Mrs. Angelica E. Grimke Weld, Lucretia Mott, of this city, and Abdy Kelly. In the meantime the mob increased and became more unruly, and threw various missiles at the windows; no further injury was done than ihe breaking the glass, and the blinds inside protected the audience. At a quarter before ten the company retired amid the cries and groans of the mob who blocked up the street on every side. One black man was knocked down with a club.POSTCRIPT—RIOT AND BURNING.Since the above was written, the work has been finished, and a deep disgrace inflicted on Philadelphia. Pennsylvania Hall was last night burned to the ground by the mob. A lecture on abolition was to have been delivered in the evening, but at the suggestion of prudent advisers it was postponed. The rioters assembled as soon as it was dark, and very deliberately commenced operations, amid the plaudits of the spectators by demolishing the stores in the basement story. This being done, the doors were beaten in, and the building was fired in several places. No attempt of any kind was made to quell the riot. When we left the ground, between nine and ten o’clock, the spacious and magnificent hall was a mass of flames, and the surrounding buildings were in much danger.MASfilun