The final amendment of that Government properly extended the time of exchanging ratifications for an additional twelve months. That time has expired. For obvious reasons connected with our internal affairs, the subject has not sooner been submitted to the Senate, but the treaty is now laid before that body, with this brief historical sketch and the decree of the Nicaraguan Government, for such further advice as may be deemed necessary and proper in regard to the acceptance or rejection of the amendments of Nicaragua. ABRAHAM LINCOLN. WASHINGTON, _April 15, 1862_. _To the Senate of the United States_: In consequence of the delay attending the approval by the Senate of the extradition treaty with Mexico signed on the 11th December last, it is impossible to effect the exchange of ratifications of that and the postal convention of the same date within the period assigned by those instruments. I recommend, therefore, the passage of a resolution at the earliest practicable moment extending the time specified in the eighth article of the extradition treaty and in the twelfth article of the postal convention for the exchange of ratifications for sixty days from and after the 11th June next, the date of the expiration of the period named for that purpose in both instruments. ABRAHAM LINCOLN. WASHINGTON, D.C., _April 15, 1862_. _To the Senate of the United States_: I transmit herewith, for the consideration and such constitutional action as the Senate may deem proper to take, a treaty negotiated on the 6th March, 1861, between late Agent Vanderslice, on the part of the United States, and certain delegates of the Sac and Fox of the Missouri and the Iowa tribes of Indians; also certain petitions of said tribes, praying that the treaty may be ratified with an amendment as set forth in said petitions. A letter of the Secretary of the Interior, with a report of the Commissioner of Indian Affairs and letter of the present agent of the Indians, accompany the treaty and petitions. ABRAHAM LINCOLN. APRIL 16, 1862. _Fellow-Citizens of the Senate and House of Representatives_: The act entitled "An act for the release of certain persons held to service or labor in the District of Columbia" has this day been approved and signed. I have never doubted the constitutional authority of Congress to abolish slavery in this District, and I have ever desired to see the national capital freed from the institution in some satisfactory way. Hence there has never been in my mind any question upon the subject except the one of expediency, arising in view of all the circumstances. If there be matters within and about this act which might have taken a course or shape more satisfactory to my judgment, I do not attempt to specify them. I am gratified that the two principles of compensation and colonization are both recognized and practically applied in the act.