By the report of the Postmaster-General it appears that the revenue of the Department during the year ending on the 30th day of June last exceeded its accruing responsibilities $236,206, and that the surplus of the present fiscal year is estimated at $476,227. It further appears that the debt of the Department on the 1st day of July last, including the amount due to contractors for the quarter then just expired, was about $1,064,381, exceeding the available means about $23,700; and that on the 1st instant about $597,077 of this debt had been paid--$409,991 out of postages accruing before July and $187,086 out of postages accruing since. In these payments are included $67,000 of the old debt due to banks. After making these payments the Department had $73,000 in bank on the 1st instant. The pleasing assurance is given that the Department is entirely free from embarrassment, and that by collection of outstanding balances and using the current surplus the remaining portion of the bank debt and most of the other debt will probably be paid in April next, leaving thereafter a heavy amount to be applied in extending the mail facilities of the country. Reserving a considerable sum for the improvement of existing mail routes, it is stated that the Department will be able to sustain with perfect convenience an annual charge of $300,000 for the support of new routes, to commence as soon as they can be established and put in operation. The measures adopted by the Postmaster-General to bring the means of the Department into action and to effect a speedy extinguishment of its debt, as well as to produce an efficient administration of its affairs, will be found detailed at length in his able and luminous report. Aided by a reorganization on the principles suggested and such salutary provisions in the laws regulating its administrative duties as the wisdom of Congress may devise or approve, that important Department will soon attain a degree of usefulness proportioned to the increase of our population and the extension of our settlements.