The receipts of the Post-Office Department can be made to approach or to equal its expenditure only by means of the legislation of Congress. In applying any remedy care should be taken that the people shall not be deprived of the advantages which they are fairly entitled to enjoy from the Post-Office Department. The principal remedies recommended to the consideration of Congress by the Postmaster-General are to restore the former rate of postage upon single letters to 5 cents; to substitute for the franking privilege the delivery to those now entitled to enjoy it of post-office stamps for their correspondence, and to direct the Department in making contracts for the transportation of the mail to confine itself to the payment of the sum necessary for this single purpose, without requiring it to be transported in post coaches or carriages of any particular description. Under the present system the expense to the Government is greatly increased by requiring that the mail shall be carried in such vehicles as will accommodate passengers. This will be done, without pay from the Department, over all roads where the travel will remunerate the contractors.

These recommendations deserve the grave consideration of Congress.

I would again call your attention to the construction of a Pacific railroad. Time and reflection have but served to confirm me in the truth and justice of the observations which I made on this subject in my last annual message, to which I beg leave respectfully to refer.

It is freely admitted that it would be inexpedient for this Government to exercise the power of constructing the Pacific railroad by its own immediate agents. Such a policy would increase the patronage of the Executive to a dangerous extent, and introduce a system of jobbing and corruption which no vigilance on the part of Federal officials could either prevent or detect. This can only be done by the keen eye and active and careful supervision of individual and private interest. The construction of this road ought therefore to be committed to companies incorporated by the States or other agencies whose pecuniary interests would be directly involved. Congress might then assist them in the work by grants of land or of money, or both, under such conditions and restrictions as would secure the transportation of troops and munitions of war free from any charge and that of the United States mail at a fair and reasonable price.

The progress of events since the commencement of your last session has shown how soon difficulties disappear before a firm and determined resolution. At that time such a road was deemed by wise and patriotic men to be a visionary project. The great distance to be overcome and the intervening mountains and deserts in the way were obstacles which, in the opinion of many, could not be surmounted. Now, after the lapse of but a single year, these obstacles, it has been discovered, are far less formidable than they were supposed to be, and mail stages with passengers now pass and repass regularly twice in each week, by a common wagon road, between San Francisco and St. Louis and Memphis in less than twenty-five days. The service has been as regularly performed as it was in former years between New York and this city.

Whilst disclaiming all authority to appropriate money for the construction of this road, except that derived from the war-making power of the Constitution, there are important collateral considerations urging us to undertake the work as speedily as possible.

The first and most momentous of these is that such a road would be a powerful bond of union between the States east and west of the Rocky Mountains. This is so self-evident as to require no illustration.

But again, in a commercial point of view, I consider this the great question of the day. With the eastern front of our Republic stretching along the Atlantic and its western front along the Pacific, if all the parts should be united by a safe, easy, and rapid intercommunication we must necessarily command a very large proportion of the trade both of Europe and Asia. Our recent treaties with China and Japan will open these rich and populous Empires to our commerce; and the history of the world proves that the nation which has gained possession of the trade with eastern Asia has always become wealthy and powerful. The peculiar geographical position of California and our Pacific possessions invites American capital and enterprise into this fruitful field. To reap the rich harvest, however, it is an indispensable prerequisite that we shall first have a railroad to convey and circulate its products throughout every portion of the Union. Besides, such a railroad through our temperate latitude, which would not be impeded by the frosts and snows of winter nor by the tropical heats of summer, would attract to itself much of the travel and the trade of all nations passing between Europe and Asia.

On the 21st of August last Lieutenant J.N. Maffit, of the United States brig Dolphin, captured the slaver Echo (formerly the Putnam, of New Orleans) near Kay Verde, on the coast of Cuba, with more than 300 African negroes on board. The prize, under the command of Lieutenant Bradford, of the United States Navy, arrived at Charleston on the 27th August, when the negroes, 306 in number, were delivered into the custody of the United States marshal for the district of South Carolina. They were first placed in Castle Pinckney, and afterwards in Fort Sumter, for safe-keeping, and were detained there until the 19th September, when the survivors, 271 in number, were delivered on board the United States steamer Niagara to be transported to the coast of Africa under the charge of the agent of the United States, pursuant to the provisions of the act of the 3d March, 1819, "in addition to the acts prohibiting the slave trade." Under the second section of this act the President is "authorized to make such regulations and arrangements as he may deem expedient for the safe-keeping, support, and removal beyond the limits of the United States of all such negroes, mulattoes, or persons of color" captured by vessels of the United States as may be delivered to the marshal of the district into which they are brought, "and to appoint a proper person or persons residing upon the coast of Africa as agent or agents for receiving the negroes, mulattoes, or persons of color delivered from on board vessels seized in the prosecution of the slave trade by commanders of United States armed vessels."

A doubt immediately arose as to the true construction of this act. It is quite clear from its terms that the President was authorized to provide "for the safe-keeping, support, and removal" of these negroes up till the time of their delivery to the agent on the coast of Africa, but no express provision was made for their protection and support after they had reached the place of their destination. Still, an agent was to be appointed to receive them in Africa, and it could not have been supposed that Congress intended he should desert them at the moment they were received and turn them loose on that inhospitable coast to perish for want of food or to become again the victims of the slave trade. Had this been the intention of Congress, the employment of an agent to receive them, who is required to reside on the coast, was unnecessary, and they might have been landed by our vessels anywhere in Africa and left exposed to the sufferings and the fate which would certainly await them.