The measures of defense authorized by existing laws have been pursued with the zeal and activity due to so important an object, and with all the dispatch practicable in so extensive and great an undertaking. The survey of our maritime and inland frontiers has been continued, and at the points where it was decided to erect fortifications the work has been commenced, and in some instances considerable progress has been made. In compliance with resolutions of the last session, the Board of Commissioners were directed to examine in a particular manner the parts of the coast therein designated and to report their opinion of the most suitable sites for two naval depots. This work is in a train of execution. The opinion of the Board on this subject, with a plan of all the works necessary to a general system of defense so far as it has been formed, will be laid before Congress in a report from the proper department as soon as it can be prepared. In conformity with the appropriations of the last session, treaties have been formed with the Quapaw tribe of Indians, inhabiting the country on the Arkansaw, and the Great and Little Osages north of the White River; with the tribes in the State of Indiana; with the several tribes within the State of Ohio and the Michigan Territory, and with the Chickasaws, by which very extensive cessions of territory have been made to the United States. Negotiations are now depending with the tribes in the Illinois Territory and with the Choctaws, by which it is expected that other extensive cessions will be made. I take great interest in stating that the cessions already made, which are considered so important to the United States, have been obtained on conditions very satisfactory to the Indians. With a view to the security of our inland frontiers, it has been thought expedient to establish strong posts at the mouth of Yellow Stone River and at the Mandan village on the Missouri, and at the mouth of St. Peters on the Mississippi, at no great distance from our northern boundaries. It can hardly be presumed while such posts are maintained in the rear of the Indian tribes that they will venture to attack our peaceable inhabitants. A strong hope is entertained that this measure will likewise be productive of much good to the tribes themselves, especially in promoting the great object of their civilization.