The report of the Postmaster-General exhibits the progress and condition of the mail service. The operations of the Post-Office Department constitute one of the most active elements of our national prosperity, and it is gratifying to observe with what vigor they are conducted. The mail routes of the United States cover an extent of about 142,877 miles, having been increased about 37,103 miles within the last two years. The annual mail transportation on these routes is about 36,228,962 miles, having been increased about 10,359,476 miles within the same period. The number of post-offices has also been increased from 10,770 to 12,099, very few of which receive the mails less than once a week, and a large portion of them daily. Contractors and postmasters in general are represented as attending to their duties with most commendable zeal and fidelity. The revenue of the Department within the year ending on the 30th of June last was $4,137,056.59, and its liabilities accruing within the same time were $3,380,847.75. The increase of revenue over that of the preceding year was $708,166.41. For many interesting details I refer you to the report of the Postmaster-General, with the accompanying papers, Your particular attention is invited to the necessity of providing a more safe and convenient building for the accommodation of that Department. I lay before Congress copies of reports submitted in pursuance of a call made by me upon the heads of Departments for such suggestions as their experience might enable them to make as to what further legislative provisions may be advantageously adopted to secure the faithful application of public moneys to the objects for which they are appropriated, to prevent their misapplication or embezzlement by those intrusted with the expenditure of them, and generally to increase the security of the Government against losses in their disbursement. It is needless to dilate on the importance of providing such new safeguards as are within the power of legislation to promote these ends, and I have little to add to the recommendations submitted in the accompanying papers.