In this universal panic, in this dread entertained, especially in Boston, by Mr. Webster's friends, of soon seeing the mighty fabric of our government trembling over their heads, it may, Sir, be consolatory to you and others to know how so dire a calamity may be averted. The chivalric Senator from Mississippi--the gentleman who threatens to hang one Senator if he dare place his foot on the soil of Mississippi, who draws a loaded pistol on another, and for a third bears a challenge to mortal combat--was lately in the city of New York. The Committee of Safety found him out, and lauded him for his fearless discharge of duty, and his fervor and devotion to the Union, and welcomed him to the commercial emporium in the name of all who appreciate the blessings we enjoy, and are willing to transmit them to their children. The worthy and conciliatory gentleman very appropriately communicated to the committee having the Union in charge the conditions on which alone it could be saved, notwithstanding its bond had so recently been strengthened. These conditions are, we learn, four in number. 1. "The Fugitive Slave Bill passed by Congress shall remain the law of the land, and be faithfully executed." Both you and Mr. Webster admit that the Constitution permits a jury trial to the fugitive. Should Congress, in its wisdom, and in obedience to the wishes of the great mass of the Northern population, and in the exercise of its constitutional power, elevate property in a human being to the same level with that in a horse, and permit a jury to pass upon the title to it,--_the Union must be dissolved_. 2. "The Wilmot Proviso, that monstrous thing, shall not be revived." It was not courteous, certainly, in Mr. Foote thus to characterize Mr. Webster's thunder. The claim to this thunder was made in his speech, September, 1847, at the Springfield Convention, which nominated him for President; and the Convention, in his presence, thus declared their devotion to his missile. "The Whigs of Massachusetts now declare, and put this declaration of their purpose _on record_, that Massachusetts will never consent that Mexican territories, however acquired, shall become a part of the American Union, unless on the _unalterable_ condition that there shall be neither slavery nor involuntary servitude, otherwise than in punishment for crime." The next year Mr. Webster launched his thunder over the Territory of Oregon, and thus in his speech (10th August, 1848) vindicated it from the character now given to it by Mr. Foote:--