During the past year our Navy has been depleted by the sale of some vessels no longer fit for naval service and by the condemnation of others not yet disposed of. This, however, has been more than compensated for by the repair of six of the old wooden ships and by the building of eight new sloops of war, authorized by the last Congress. The building of these latter has occurred at a doubly fortunate time. They are about being completed at a time when they may possibly be much needed, and the work upon them has not only given direct employment to thousands of men, but has no doubt been the means of keeping open establishments for other work at a time of great financial distress. Since the commencement of the last month, however, the distressing occurrences which have taken place in the waters of the Caribbean Sea, almost on our very seaboard, while they illustrate most forcibly the necessity always existing that a nation situated like ours should maintain in a state of possible efficiency a navy adequate to its responsibilities, has at the same time demanded that all the effective force we really have shall be put in immediate readiness for warlike service. This has been and is being done promptly and effectively, and I am assured that all the available ships and every authorized man of the American Navy will be ready for whatever action is required for the safety of our citizens or the maintenance of our honor. This, of course, will require the expenditure in a short time of some of the appropriations which were calculated to extend through the fiscal year, but Congress will, I doubt not, understand and appreciate the emergency, and will provide adequately not only for the present preparation, but for the future maintenance of our naval force. The Secretary of the Navy has during the past year been quietly putting some of our most effective monitors in condition for service, and thus the exigency finds us in a much better condition for work than we could possibly have been without his action. POST-OFFICE DEPARTMENT. A complete exhibit is presented in the accompanying report of the Postmaster-General of the operations of the Post-Office Department during the year. The ordinary postal revenues for the fiscal year ended June 30, 1873, amounted to $22,996,741.57, and the expenditures of all kinds to $29,084,945.67. The increase of revenues over 1872 was $1,081,315.20, and the increase of expenditures $2,426,753.36. Independent of the payments made from special appropriations for mail steamship lines, the amount drawn from the General Treasury to meet deficiencies was $5,265,475. The constant and rapid extension of our postal service, particularly upon railways, and the improved facilities for the collection, transmission, distribution, and delivery of the mails which are constantly being provided account for the increased expenditures of this popular branch of the public service.