The Secretary of the Navy, by the direction of the President, announces to the Navy and to the Marine Corps the lamented death of the Hon. Aaron V. Brown, Postmaster-General of the United States. He died at his residence in the city of Washington on the 8th of the present month. As a mark of respect to his high character, his eminent position, and great public services, it is directed that on the day after the receipt of this order by the different navy-yards and stations and vessels of war of the United States in commission the flags be hoisted at half-mast from sunrise to sunset and that seventeen minute guns be fired at noon. Officers of the Navy and Marine Corps will wear crape on the left arm for thirty days. The Navy Department will be draped in mourning and will be closed until after the funeral. ISAAC TOUCEY, _Secretary of the Navy_. THIRD ANNUAL MESSAGE. WASHINGTON CITY, _December 19, 1859_. _Fellow-Citizens of the Senate and House of Representatives_: Our deep and heartfelt gratitude is due to that Almighty Power which has bestowed upon us such varied and numerous blessings throughout the past year. The general health of the country has been excellent, our harvests have been unusually plentiful, and prosperity smiles throughout the land. Indeed, notwithstanding our demerits, we have much reason to believe from the past events in our history that we have enjoyed the special protection of Divine Providence ever since our origin as a nation. We have been exposed to many threatening and alarming difficulties in our progress, but on each successive occasion the impending cloud has been dissipated at the moment it appeared ready to burst upon our head, and the danger to our institutions has passed away. May we ever be under the divine guidance and protection. Whilst it is the duty of the President "from time to time to give to Congress information of the state of the Union," I shall not refer in detail to the recent sad and bloody occurrences at Harpers Ferry. Still, it is proper to observe that these events, however bad and cruel in themselves, derive their chief importance from the apprehension that they are but symptoms of an incurable disease in the public mind, which may break out in still more dangerous outrages and terminate at last in an open war by the North to abolish slavery in the South.