So deep and solemn was his conviction of the importance of the Union and of preserving harmony between its different parts, that he declared to his countrymen in that address: It is of infinite moment that you should properly estimate the immense value of your national union to your collective and individual happiness; that you should cherish a cordial, habitual, and immovable attachment to it; accustoming yourselves to think and speak of it as of the palladium of your political safety and prosperity; watching for its preservation with jealous anxiety; discountenancing whatever may suggest even a suspicion that it can in any event be abandoned, and indignantly frowning upon the first dawning of every attempt to alienate any portion of our country from the rest or to enfeeble the sacred ties which now link together the various parts. After the lapse of half a century these admonitions of Washington fall upon us with all the force of truth. It _is_ difficult to estimate the "immense value" of our glorious Union of confederated States, to which we are so much indebted for our growth in population and wealth and for all that constitutes us a great and a happy nation. How unimportant are all our differences of opinion upon minor questions of public policy compared with its preservation, and how scrupulously should we avoid all agitating topics which may tend to distract and divide us into contending parties, separated by geographical lines, whereby it may be weakened or endangered. Invoking the blessing of the Almighty Ruler of the Universe upon your deliberations, it will be my highest duty, no less than my sincere pleasure, to cooperate with you in all measures which may tend to promote the honor and enduring welfare of our common country. JAMES K. POLK. SPECIAL MESSAGES. WASHINGTON, _December 20, 1847_. _To the Senate of the United States_: I herewith communicate to the Senate, for their consideration and advice with regard to its ratification, a convention between the United States and the Swiss Confederation, signed in this city by their respective plenipotentiaries on the 18th day of May last, for the mutual abolition of the _droit d'aubaine_ and of taxes on emigration. JAMES K. POLK. WASHINGTON, _December 21, 1847_. _To the Senate of the United States_: I submit herewith, for the consideration and constitutional action of the Senate, two treaties with the Chippewa Indians of Lake Superior and the Upper Mississippi, for a portion of the lands possessed by those Indians west of the Mississippi River. The treaties are accompanied by communications from the Secretary of War and Commissioner of Indian Affairs, which fully explain their nature and objects. JAMES K. POLK. WASHINGTON, _December 22, 1847_. _To the Senate and House of Representatives_: