Mr. Cobb, Mr. Floyd, and Mr. Thompson had all remained in the Cabinet after the Presidential election in November, in full sympathy, and so far as was possible in full co-operation, with the men in the South who were organizing resistance to the authority of the Federal Government. Neither those gentlemen, nor any friend in their behalf, ever ventured to explain how, as sworn officers of the United States, they could remain at their posts consistently with the laws of honor,--laws obligatory upon them not only as public officials who had taken a solemn oath of fidelity to the Constitution, but also as private gentlemen whose good faith was pledged anew every hour they remained in control of the departments with whose administration they had been intrusted. Their course is unfavorably contrasted with that of many Southern men (of whom General Lee and the two Johnstons were conspicuous examples), who refused to hold official positions under the National Government a single day after they had determined to take part in the scheme of Disunion. BUCHANAN'S RECONSTRUCTED CABINET. By the re-organization of the Cabinet, the tone of Mr. Buchanan's administration was radically changed. Judge Black had used his influence with the President to secure trustworthy friends of the Union in every department. Edwin M. Stanton, little known at the time to the public, but of high standing in his profession, was appointed Attorney-General soon after Judge Black took charge of the State Department. Judge Black had been associated with Stanton personally and professionally, and was desirous of his aid in the dangerous period through which he was called to serve. Joseph Holt, who, since the death of Aaron V. Brown in 1859, had been Postmaster-General, was now appointed Secretary of War, and Horatio King of Maine, for many years the upright first assistant, was justly promoted to the head of the Post-office Department. Mr. Holt was the only Southern man left in the Cabinet. He was a native of Kentucky, long a resident of Mississippi, always identified with the Democratic party, and affiliated with its extreme Southern wing. Without a moment's hesitation he now broke all the associations of a lifetime, and stood by the Union without qualification or condition. His learning, his firmness, and his ability, were invaluable to Mr. Buchanan in the closing days of his administration.