The stone dock in the navy-yard at New York, which was ten years in process of construction, has been so far finished as to be surrendered up to the authorities of the yard. The dry dock at Philadelphia is reported as completed, and is expected soon to be tested and delivered over to the agents of the Government. That at Portsmouth, N. H., is also nearly ready for delivery; and a contract has been concluded, agreeably to the act of Congress at its last session, for a floating sectional dock on the Bay of San Francisco. I invite your attention to the recommendation of the Department touching the establishment of a navy-yard in conjunction with this dock on the Pacific. Such a station is highly necessary to the convenience and effectiveness of our fleet in that ocean, which must be expected to increase with the growth of commerce and the rapid extension of our whale fisheries over its waters. The Naval Academy at Annapolis, under a revised and improved system of regulations, now affords opportunities of education and instruction to the pupils quite equal, it is believed, for professional improvement, to those enjoyed by the cadets in the Military Academy. A large class of acting midshipmen was received at the commencement of the last academic term, and a practice ship has been attached to the institution to afford the amplest means for regular instruction in seamanship, as well as for cruises during the vacations of three or four months in each year. The advantages of science in nautical affairs have rarely been more strikingly illustrated than in the fact, stated in the report of the Navy Department, that by means of the wind and current charts projected and prepared by Lieutenant Maury, the Superintendent of the Naval Observatory, the passage from the Atlantic to the Pacific ports of our country has been shortened by about forty days. The estimates for the support of the Navy and Marine Corps the ensuing fiscal year will be found to be $5,856,472.19, the estimates for the current year being $5,900,621. The estimates for special objects under the control of this Department amount to $2,684,220.89, against $2,210,980 for the present year, the increase being occasioned by the additional mail service on the Pacific Coast and the construction of the dock in California, authorized at the last session of Congress, and some slight additions under the head of improvements and repairs in navy-yards, buildings, and machinery. I deem it of much importance to a just economy and a correct understanding of naval expenditures that there should be an entire separation of the appropriations for the support of the naval service proper from those for permanent improvements at navy-yards and stations and from ocean steam mail service and other special objects assigned to the supervision of this Department. The report of the Postmaster-General, herewith communicated, presents an interesting view of the progress, operations, and condition of his Department.