The radical element of the Republican Party held their Convention first, at Cleveland, Ohio, on May 31, 1864, and nominated John C. Fremont for President and John Cochrane for Vice-President, but these candidates withdrew on September 2d, and no further notice of this meeting is necessary. The regular Republican Convention, or National Union Convention, as it was called, was held at Baltimore on June 7 and 8, 1864, in the Front Street Theater. The Convention was again called to order by Edwin B. Morgan, of New York, who, after a short speech, proposed the name of Robert J. Breckinridge, of Kentucky, for temporary Chairman. Mr. Breckinridge accepted the honor, and said that he did not enter the deliberations of the Convention as a Republican, nor as a Whig or Democrat, but as a Union man. There was some debate over the seating of loyal delegates from the Confederate States, which was settled by admitting them; thirty-one States, including eight of the slave States, were represented. The usual committees on Credentials, Permanent Organization and Resolutions were appointed. The Committee reported the name of William Dennison, of Ohio, for permanent Chairman. The platform was reported by Henry J. Raymond, of New York, and enthusiastically adopted. The Republican Platform of 1864, framed while a great Civil War was in progress, is a most interesting document.

REPUBLICAN PLATFORM, 1864.

1. Resolved, That it is the highest duty of every American citizen to maintain against all their enemies the integrity of the Union and the paramount authority of the Constitution and laws of the United States; and that, laying aside all differences of political opinion, we pledge ourselves as Union men, animated by a common sentiment and aiming at a common object, to do everything in our power to aid the government in quelling by force of arms the rebellion now raging against its authority, and in bringing to the punishment due to their crimes the rebels and traitors arrayed against it.

2. Resolved, That we approve the determination of the government of the United States not to compromise with rebels, or to offer them any terms of peace except such as may be based upon an unconditional surrender of their hostility and a return to their just allegiance to the Constitution and laws of the United States; and that we call upon the government to maintain this position and to prosecute the war with the utmost possible vigor, to the complete suppression of the rebellion, in full reliance upon the self-sacrificing patriotism, the heroic valor, and the undying devotion of the American people to the country and its free institutions.

3. Resolved, That as slavery was the cause and now constitutes the strength of this rebellion, and as it must be always and everywhere hostile to the principles of republican government, justice and the national safety demand its utter and complete extirpation from the soil of the republic; and that while we uphold and maintain the acts and proclamations by which the government, in its own defense, has aimed a death-blow at this gigantic evil, we are in favor, furthermore, of such an amendment to the Constitution, to be made by the people in conformity with its provisions, as shall terminate and forever prohibit the existence of slavery within the limits of the jurisdiction of the United States.

4. Resolved, That the thanks of the American people are due to the soldiers and sailors of the army and navy who have periled their lives in defense of the country and in vindication of the honor of its flag; that the nation owes to them some permanent recognition of their patriotism and their valor, and ample and permanent provision for those of their survivors who have received disabling and honorable wounds in the service of the country; and that the memories of those who have fallen in its defense shall be held in grateful and everlasting remembrance.

5. Resolved, That we approve and applaud the practical wisdom, the unselfish patriotism, and the unswerving fidelity to the Constitution and the principles of American liberty with which Abraham Lincoln has discharged, under circumstances of unparalleled difficulty, the great duties and responsibilities of the presidential office; that we approve and indorse, as demanded by the emergency and essential to the preservation of the nation, and as within the provisions of the Constitution, the measures and acts which he has adopted to defend the nation against its open and secret foes; that we approve especially the proclamation of emancipation and the employment as Union soldiers of men heretofore held in slavery; and that we have full confidence in his determination to carry these and all other constitutional measures essential to the salvation of the country into full and complete effect.

6. Resolved, That we deem it essential to the general welfare that harmony should prevail in the national councils, and we regard as worthy of public confidence and official trust those only who cordially indorse the principles proclaimed in these resolutions, and which should characterize the administration of the government.

7. Resolved, That the government owes to all men employed in its armies, without regard to distinction of color, the full protection of the laws of war; and that any violation of these laws, or of the usages of civilized nations in time of war, by the rebels now in arms, should be made the subject of prompt and full redress.

8. Resolved, That foreign immigration, which in the past has added so much to the wealth, development of resources, and increase of power to the nation—the asylum of the oppressed of all nations—should be fostered and encouraged by a liberal and just policy.