Wm. S. Young, Esq., was called to the chair, by the temporary absence of the Rev. Dr. Church, the regular chairman. The Rev. Mr. Johnston, of the Old School Presbyterian Church, as I was informed, opened the meeting with prayer. A note was then read from the Chairman (Rev. Dr. Church,) expressive of his regret for unavoidable absence, and expressing the desire that the meeting might be favored with the best consequences, &c. By reading the minutes of the last meeting it occurred that, agreeably to announcement, Prof. A. M. Green had been invited to address the meeting on the Duty of the Colored People of the North in Relation to the Great Rebellion. At eight o’clock Mr. Green was introduced, and proceeded with great ability to reason not only the propriety but the practical necessity of colored men taking an active part in this war, against the aggressive power of the mighty dragon of the nineteenth century, American slavery. Mr. Green argued that, viewed from whatever stand-point, every honest man must conclude that this war is one that has been inaugurated by the labors of abolitionists and anti-slavery men, in a moral contest against this great evil; men have avowed it to be their purpose to bring the two elements to a hand-to-hand struggle; the efforts of our party for thirty years have been to array the North against the South on this question of slavery. And though the government denies the responsibility to be incurred by acknowledging the true issue, yet it also denies that it had any thing to do with inaugurating it. It is just as emphatically true that the government cannot control the issue involved in this war, as it is true that it could not for thirty years control the moral conflict kept up on this same question. It was our duty from very many considerations, elaborately presented by Mr. Green, to bear an honorable part in the great contest.