It was soon manifest however to Judge Black, that he was playing with fire, and that, while he was himself desirous only of arousing the country to the dangers of anti-slavery agitation, Mr. Buchanan's administration was every day effectually aiding the Southern conspiracy for the destruction of the Union. This light dawned on Judge Black suddenly and irresistibly. He was personally intimate with General Cass, and when that venerable statesman retired from the Cabinet to preserve his record of loyalty to the Union, Judge Black realized that he was himself confronted by an issue which threatened his political destruction. Could he afford, as Secretary of State, to follow a policy which General Cass believed would destroy his own fame? General Cass was nearly fourscore years of age, with his public career ended, his work done. Judge Black was but fifty, and he had before him possibly the most valuable and most ambitious period of his life. He saw at a glance that if General Cass could not be sustained in the North-West, he could not be sustained in Pennsylvania. He possessed the moral courage to stand firm to the end, in defiance of opposition and regardless of obloquy, if he could be sure he was right. But he had begun to doubt, and doubt led him to review with care the position of Mr. Buchanan, and to examine its inevitable tendencies. He did it with conscience and courage. He had none of that subserviency to Southern men which had injured so many Northern Democrats. Until he entered the Cabinet in 1857, he had never come into personal association with men from the slave-holding States, and his keen observation could not fail to discern the inferiority to himself of the four Southern members of the Cabinet. Judge Black entered upon his duties as Secretary of State on the 17th of December,--the day on which the Disunion convention of South Carolina assembled. He found the malign influence of Mr. Buchanan's message fully at work throughout the South. Under its encouragement only three days were required by the convention at Charleston to pass the Ordinance of Secession, and four days later Governor Pickens issued a proclamation declaring "South Carolina a separate, sovereign, free, and independent State, with the right to levy war, conclude peace, and negotiate treaties." From that moment Judge Black's position towards the Southern leaders was radically changed. They were no longer fellow-Democrats. They were the enemies of the Union to which he was devoted: they were conspirators against the government to which he had taken a solemn oath of fidelity and loyalty.