In calling the Convention to order Governor Morgan of New York made a brief speech advocating a constitutional amendment abolishing slavery. Dr. Robert J. Breckinridge of Kentucky was chosen temporary chairman. The appearance on the platform of this venerable and venerated divine was in itself an event of great interest. By birth and association he was connected with the aristocratic class which furnished the pillars of the Confederacy; he belonged to a family conspicuously identified with the rebellion; yet among his own order he was the strongest and sturdiest champion of the Union cause south of the Ohio. His pointed eloquence was equaled by his indomitable courage. The aggressive qualities of his staunch Scotch ancestry shone in his own resolute and unyielding character, and he was distinguished both in Church and in State as an able and uncompromising controversialist. His years and his history inspired a general feeling of reverence; and as he was conducted to the chair of the Convention, his tall figure, strong face, and patriarchal beard imparted to him something of personal majesty. His speech well illustrated his rugged attributes of character. It was sharp, sinewy, and defiant. At the beginning he hurled out the declaration that "the nation shall not be destroyed;" and referring to the plea which treated the Constitution as the sacred shield of the system that was waging war on the Union and which insisted that it must remain untouched, he proclaimed that "we shall change the Constitution if it suits us to do so." He solemnly affirmed "that the only enduring, the only imperishable cement of all free institutions has been the blood of traitors." He alluded to the fact that he had lived amid the surroundings of slavery, and had been among those who sustained and upheld the system; but, recognizing that it was this institution which had lifted the sword against the Union, he aroused the enthusiasm of his vast audience by his unhesitating declaration that we must "use all power to exterminate and extinguish it." Next to the official platform itself, the speech of Dr. Breckinridge was the most inspiring utterance of the Convention.

When the question of calling the roll of the Southern States and of receiving their delegates was reached, Thaddeus Stevens objected on the ground that such an act might be regarded as recognizing the right of States in rebellion to participate in the Electoral College. The Convention decided however to call the roll of all the States, and to refer the question of admitting their delegates to the Committee on Credentials. Ex-Governor Dennison of Ohio was elected permanent president. Preston King of New York from the Committee on Credentials reported in favor of admitting the Radical Union delegation from Missouri, and excluding the Conservative Union or Blair delegation. It was proposed to amend by admitting both delegations to seats; but the recognition of the Radical Union delegation was urged on the ground not only that they were regularly elected, but that it was the duty of the Convention to strengthen the advanced Union sentiment of the South, and that their admission would be the practical adhesion of the national party to the broad anti-slavery policy which was essential to the salvation of the country. This view prevailed by a vote of 440 to 4. The admission of the delegations from Tennessee, Arkansas, and Louisiana was a question of no less interest. It involved the effect of the rebellion upon the relation of the rebelling States to the Union. Could they have a voice in public affairs without specific measures of restoration, or were the acts of secession a nullity without influence upon their legal status? The committee reported in favor of admitting the delegations from these States, without the right to vote. The chairman, Mr. King, was the only member who dissented, and he moved to amend by admitting them on the same footing as all the other delegates. The question was first taken on Tennessee, and the amendment was carried by a vote of 310 to 153—a decision which had an important bearing on the subsequent nomination for Vice-President. The delegates from Arkansas and Louisiana were given the right to vote by 307 to 167. The Territories of Colorado, Nebraska, and Nevada were soon to enter the Union as States, and their delegates were allowed to vote. The remaining Territories and the States of Virginia and Florida were admitted without the right to vote.

THE PLATFORM AND THE CANDIDATE.

With the completion of the organization the Committee on Resolutions made their report through Mr. Henry J. Raymond. The platform upon which it had unanimously agreed was a trenchant and powerful declaration of policy. Its tone was elevated, its expression was direct and unequivocal. It pledged every effort to aid the Government in quelling by force of arms the rebellion against its authority; it approved "the determination of the government not to compromise with rebels nor 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 it called upon the government to prosecute the war with the utmost possible vigor to the complete suppression of the Rebellion. It 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 it declared for "such an amendment to the Constitution as shall terminate and forever prohibit the existence of slavery within the limits or jurisdiction of the United States." The heroism of the soldiers and sailors of the Republic was gratefully acknowledged. The wisdom, patriotism, and fidelity of President Lincoln, and his measures for the defense of the nation were approved. A general expression that harmony should prevail in the national councils was interpreted as contemplating a possible reconstruction of the Cabinet. Declarations for the encouragement of foreign immigration by a liberal policy, for the speedy construction of a Pacific railroad, for the inviolability of the National faith, and for the re-assertion of the Monroe doctrine, completed a platform which in all its parts was pervaded by the most vigorous spirit. Its commanding feature was its explicit demand for the abolition of slavery. The President's Proclamation of Emancipation had been issued more than a year before, but this was the first National assemblage with power to make it the fixed policy of a party. The Baltimore platform, which was adopted by acclamation, made this the paramount issue, and from that hour Freedom and the Union were inseparably associated.

The nomination for President being in order, there was a strife for the honor of naming Mr. Lincoln. General Simon Cameron offered a resolution declaring Abraham Lincoln the choice of the Union party for President, and Hannibal Hamlin its candidate for Vice- President. To this proposition the immediate objection was made that it might be open to the misconstruction of not permitting a free vote, and that it complicated the selection for the first place with a contest over the second. After some discussion General Cameron withdrew his resolution, and on a general demand, in order to remove all ground for the charge that the nomination was forced, the roll of the Convention was called. Abraham Lincoln was named by 497 delegates,—all of the Convention except the 22 from Missouri, who under instructions voted for General Grant. Amid great enthusiasm Mr. Lincoln's nomination was then declared to be unanimous.

CANDIDATES FOR THE VICE-PRESIDENT.

The Vice-Presidency had excited an animated contest. While many felt that the old ticket should remain unbroken, and that Mr. Hamlin should continue to be associated with Mr. Lincoln, there was a wide sentiment in favor of recognizing the war Democrats, who had acted with the Union party, by selecting one of their number for the second place. Two prominent representatives of this class were suggested,—Daniel S. Dickinson of New York and Andrew Johnson of Tennessee. One was identified with the patriotic Democrats of the North and the other with the sturdy and intrepid Unionists of the South. Mr. Dickinson, by reason both of his earnest loyalty and of his coming from the important State of New York, was regarded in many quarters with special favor. The Massachusetts delegation early declared their preference, and sent a message to the New-York delegation announcing their purpose to vote for him if New York would present him as a candidate. Had New York given him a united support his nomination would not have been doubtful. But the very reasons which commended him in other sections excited jealousy in his own State, and prompted an opposition which led to his defeat.

Mr. Dickinson's career had been long and honorable. He had been chosen to the State Senate in 1837, and quickly attained a leading place. After serving as lieutenant-governor, he was in 1844 appointed United-States senator by Governor Bouck to fill a vacancy, and was subsequently elected by the Legislature for a full term. Appearing in the Senate at the important juncture when the annexation of Texas and the Mexican war were agitating the country, he soon took an active part in the discussions. He was particularly distinguished for his aptness in repartee, and for his keen and incisive humor. Politically he belonged to the conservative or Hunker wing of the Democracy. Entering the Senate just as Silas Wright was leaving it to assume the Governor's chair, he joined Secretary Marcy and the influences that moulded Polk's Administration, against the able and powerful statesman who had so long held sway over the Democratic party in New York. Mr. Dickinson's talent made him the leader of the Hunkers, and in 1852 he was one of their candidates for President. When the war came, he declared himself unreservedly on the side of the Government, and rendered valuable service to the Union party. He was especially effective on the stump. His sharp wit, his rich fund of anecdotes, his sparkling humor, his singular felicity and aptness of biblical illustration, which had earned for him the popular name of "Scripture Dick," served to give him wonderful command over an audience, and the effect was heightened by his personal appearance, which his long, flowing silvery locks made strikingly impressive.

The suggestion of Mr. Dickinson's name for Vice-President was cordially received by many delegates. But some of the controlling influences among the New-York Republicans were not well disposed towards the advancement of those who came from the Democratic ranks. They feared, besides, that if the candidate from Vice-President were taken from New York, it might prejudice her claims for the Cabinet, and might endanger Mr. Seward's position as Secretary of State. For these reasons their influence was thrown against Mr. Dickinson's nomination. On a test-vote in the New-York delegation, Dickinson received 28, Johnson 22, and Hamlin 6. This result was fatal to Mr. Dickinson's chances, and brought Mr. Johnson prominently forward. His record and character had much to attract the patriotic respect of the country. The vigor and boldness with which, though a Southern senator, he had denounced secession at the beginning of the outbreak, had taken strong hold of the popular heart. The firmness and unyielding loyalty he had displayed as Military Governor of Tennessee greatly deepened the favorable impression. The delegates from his own and other Southern States had been admitted to the Convention as an evidence that the Republican party honored the tried and faithful loyalists of the South, and many felt that the nomination of Mr. Johnson would emphasize this sentiment, and free the party from the imputation of sectional passion and purpose. The ballot for Vice-President gave Johnson 200; Dickinson 113; Hamlin 145; General B. F. Butler 26; General L. H. Rousseau 21; with a few scattering votes. Before the final announcement, several delegations changed to Johnson, until as declared the ballot stood, Johnson 492; Dickinson 17; Hamlin 9. Mr. Johnson was then unanimously nominated. The Convention had completed its work, and the results were hailed with satisfaction throughout the country.

The Republicans had been compelled in 1856 and 1860 to nominate their candidates both for President and Vice-President from the North. This was contrary to the patriotic traditions of the country with which a single exception had in all parties divided the candidates between the two great sections of the country. Strangely enough both parties violated the practice in the exciting canvass of 1828, when Jackson and Calhoun were the candidates of the Democratic party and Adams and Rush were the candidates of the National Republican party. The nomination now of Andrew Johnson from the South tended, in the phrase of the day, to nationalize the Republican party, and this consideration gave it popularity throughout the North. It was nevertheless felt by many of Mr. Hamlin's friends to be an injustice to him. But it did him no injury. He accepted the result in a cordial manner and worked earnestly for the success of the nominees. The whole country saw that the grounds upon which Mr. Hamlin was superseded were not in derogation of the honorable record he had made in his long and faithful public career.