The report of the Secretary of the Navy will bring you acquainted with that important branch of the public defenses. Considering the already vast and daily increasing commerce of the country, apart from the exposure to hostile inroad of an extended seaboard, all that relates to the Navy is calculated to excite particular attention. Whatever tends to add to its efficiency without entailing unnecessary charges upon the Treasury is well worthy of your serious consideration. It will be seen that while an appropriation exceeding by more than a million the appropriations of the current year is asked by the Secretary, yet that in this sum is proposed to be included $400,000 for the purchase of clothing, which when once expended will be annually reimbursed by the sale of the clothes, and will thus constitute a perpetual fund without any new appropriation to the same object. To this may also be added $50,000 asked to cover the arrearages of past years and $250,000 in order to maintain a competent squadron on the coast of Africa; all of which when deducted will reduce the expenditures nearly within the limits of those of the current year. While, however, the expenditures will thus remain very nearly the same as of the antecedent year, it is proposed to add greatly to the operations of the marine, and in lieu of only 25 ships in commission and but little in the way of building, to keep with the same expenditure 41 vessels afloat and to build 12 ships of a small class. A strict system of accountability is established and great pains are taken to insure industry, fidelity, and economy in every department of duty. Experiments have been instituted to test the quality of various materials, particularly copper, iron, and coal, so as to prevent fraud and imposition. It will appear by the report of the Postmaster-General that the great point which for several years has been so much desired has during the current year been fully accomplished. The expenditures of the Department for current service have been brought within its income without lessening its general usefulness. There has been an increase of revenue equal to $166,000 for the year 1842 over that of 1841, without, as it is believed, any addition having been made to the number of letters and newspapers transmitted through the mails. The post-office laws have been honestly administered, and fidelity has been observed in accounting for and paying over by the subordinates of the Department the moneys which have been received. For the details of the service I refer you to the report.