In the afternoon the party visited the prisoners at Camp Morton, where Mr. Brownlow made a brief speech, to which some of the rebels gave no very grateful reception. He was met with jeers, and cries of "Put him out," "Don't want him here," "The old traitor," &c., which he, having faced worse treatment under far more dangerous circumstances, gave little heed to. The insults came chiefly from the Kentucky prisoners, who have been, from the start, the most obstreperous and unrepentant of the rebel keepsakes. Notice was given that the Parson would address the public in the evening at Metropolitan Hall. Although the night was dark and rainy, the large hall was crowded to its utmost capacity, with a highly intelligent audience. After music by the band of the 19th U. S. Regiment, the meeting was opened with prayers by Rev. James Havens. The following gentlemen of the committee occupied seats on the platform: WM. HANNAMAN, DAVID MCDONALD, GOVERNOR MORTON, MAYOR MAXWELL, CALVIN FLETCHER, ESQ. COL. JAMES BLAKE, J. H. MCKERNAN, ESQ. B. R. SULGROVE, ESQ. ALFRED HARRISON, ESQ. SPEECH. Gov. Morton then introduced Mr. Brownlow, who spoke at length of the causeless character of the rebellion, and its disastrous effects, and was frequently cordially cheered by his large audience. He gave an account of his ancestry, and showed how they had all been engaged in the service of the country, and always true to its flag and its principles. He said he had been called a traitor by R. Barnwell Rhett, of South Carolina. "Rhett" said he, "was named R. Barnwell Smith, but the Smiths being all Tories during the Revolution, he was allowed by a legislative act to call himself Rhett. He call _me_ a traitor," said the iron old Parson indignantly, "when his illustrious ancestors were hunted by Marion through all the mosquito swamps of South Carolina." (Uproarious cheers and laughter.) He commented at considerable length on the rebellion and its leaders, and declared, with great emphasis, that "if the issue was to be made between the Union without slavery, and slavery without the Union, he was for the Union and let slavery perish. (Great applause.) Let every institution die first, and until the issue was made between the Union and the religion of Jesus Christ, he was for the Union." (Tremendous cheers.) We have not space to report his whole speech, which was considerably over an hour in length, and was listened to with close and intense attention by all, and we must content ourselves with a report of the outrages practiced on the Union men, which he detailed with impressive eloquence and pathos.