[The same message was addressed to the Speaker of the House of Representatives.] WASHINGTON CITY, _December 23, 1839_. _To the Senate and House of Representatives of the United States_: I herewith communicate to Congress copies of a letter from the governor of Iowa to the Secretary of State and of the documents transmitted with it, on the subject of a dispute respecting the boundary line between that Territory and the State of Missouri. The disagreement as to the extent of their respective jurisdictions has produced a state of such great excitement that I think it necessary to invite your early attention to the report of the commissioner appointed to run the line in question under the act of the 18th of June, 1838, which was sent to both Houses of Congress by the Secretary of State on the 30th of January last. M. VAN BUREN. DECEMBER 24, 1839. _To the Senate and House of Representatives of the United States_: I transmit herewith to Congress a report from the Secretary of State, on the subject of the law providing for taking the Sixth Census of the United States, to which I invite your early attention. M. VAN BUREN. WASHINGTON, _December 28, 1839_. _To the Senate and House of Representatives of the United States_: I herewith transmit a report from the Secretary of the Treasury, in relation to the employment of steam vessels in the Revenue-Cutter Service, and recommend the subject to the special and favorable consideration of Congress. M. VAN BUREN. WASHINGTON, _December 30, 1839_. _To the Senate and House of Representatives_: I transmit to Congress copies of a communication from Governor Lucas, and of additional documents, in relation to the disputed boundary line between the Territory of Iowa and the State of Missouri. M. VAN BUREN. WASHINGTON, _December 31, 1839_. _To the Senate and House of Representatives of the United States_: I communicate to Congress a report from the Secretary of State, in relation to applications on the part of France for the extension to vessels coming from the colonies of French Guiana and Senegal of the benefits granted by the act of the 9th of May, 1828, to vessels of the same nation coming from the islands of Guadaloupe and Martinique, and for the repayment of duties levied in the district of Newport upon the French ship _Alexandre_ and part of her cargo. The circumstances under which these duties were demanded being, as stated by the Secretary of the Treasury, of a character to entitle the parties to relief, I recommend the adoption of the necessary legislative provisions to authorize their repayment. I likewise invite your attention to the evidence contained in the accompanying documents as to the treatment of our vessels in the port of Cayenne, which will doubtless be found by Congress such as to authorize the application to French vessels coming from that colony of the liberal principles of reciprocity which have hitherto governed the action of the legislature in analogous cases.