The estimates for this branch of the public service do not differ materially from those of last year, those for the general support of the service being somewhat less and those for permanent improvements at the various stations rather larger than the corresponding estimate made a year ago. The regular maintenance and a steady increase in the efficiency of this most important arm in proportion to the growth of our maritime intercourse and interests is recommended to the attention of Congress.

The use of the Navy in time of peace might be further utilized by a direct authorization of the employment of naval vessels in explorations and surveys of the supposed navigable waters of other nationalities on this continent, especially the tributaries of the two great rivers of South America, the Orinoco and the Amazon. Nothing prevents, under existing laws, such exploration, except that expenditures must be made in such expeditions beyond those usually provided for in the appropriations. The field designated is unquestionably one of interest and one capable of large development of commercial interests--advantageous to the peoples reached and to those who may establish relations with them.

Education of the people entitled to exercise the right of franchise I regard essential to general prosperity everywhere, and especially so in republics, where birth, education, or previous condition does not enter into account in giving suffrage. Next to the public school, the post-office is the great agent of education over our vast territory. The rapidity with which new sections are being settled, thus increasing the carrying of mails in a more rapid ratio than the increase of receipts, is not alarming. The report of the Postmaster-General herewith attached shows that there was an increase of revenue in his Department in 1873 over the previous year of $1,674,411, and an increase of cost of carrying the mails and paying employees of $3,041,468.91. The report of the Postmaster-General gives interesting statistics of his Department, and compares them with the corresponding statistics of a year ago, showing a growth in every branch of the Department.

A postal convention has been concluded with New South Wales, an exchange of postal cards established with Switzerland, and the negotiations pending for several years past with France have been terminated in a convention with that country, which went into effect last August.

An international postal congress was convened in Berne, Switzerland, in September last, at which the United States was represented by an officer of the Post-Office Department of much experience and of qualification for the position. A convention for the establishment of an international postal union was agreed upon and signed by the delegates of the countries represented, subject to the approval of the proper authorities of those countries.

I respectfully direct your attention to the report of the Postmaster-General and to his suggestions in regard to an equitable adjustment of the question of compensation to railroads for carrying the mails.

Your attention will be drawn to the unsettled condition of affairs in some of the Southern States.

On the 14th of September last the governor of Louisiana called upon me, as provided by the Constitution and laws of the United States, to aid in suppressing domestic violence in that State. This call was made in view of a proclamation issued on that day by D. B. Penn, claiming that he was elected lieutenant-governor in 1872, and calling upon the militia of the State to arm, assemble, and drive from power the usurpers, as he designated the officers of the State government. On the next day I issued my proclamation commanding the insurgents to disperse within five days from the date thereof, and subsequently learned that on that day they had taken forcible possession of the statehouse. Steps were taken by me to support the existing and recognized State government, but before the expiration of the five days the insurrectionary movement was practically abandoned, and the officers of the State government, with some minor exceptions, resumed their powers and duties. Considering that the present State administration of Louisiana has been the only government in that State for nearly two years; that it has been tacitly acknowledged and acquiesced in as such by Congress, and more than once expressly recognized by me, I regarded it as my clear duty, when legally called upon for that purpose, to prevent its overthrow by an armed mob under pretense of fraud and irregularity in the election of 1872. I have heretofore called the attention of Congress to this subject, stating that on account of the frauds and forgeries committed at said election, and because it appears that the returns thereof were never legally canvassed, it was impossible to tell thereby who were chosen; but from the best sources of information at my command I have always believed that the present State officers received a majority of the legal votes actually cast at that election. I repeat what I said in my special message of February 23, 1873, that in the event of no action by Congress I must continue to recognize the government heretofore recognized by me.

I regret to say that with preparations for the late election decided indications appeared in some localities in the Southern States of a determination, by acts of violence and intimidation, to deprive citizens of the freedom of the ballot because of their political opinions. Bands of men, masked and armed, made their appearance; White Leagues and other societies were formed; large quantities of arms and ammunition were imported and distributed to these organizations; military drills, with menacing demonstrations, were held, and with all these murders enough were committed to spread terror among those whose political action was to be suppressed, if possible, by these intolerant and criminal proceedings. In some places colored laborers were compelled to vote according to the wishes of their employers, under threats of discharge if they acted otherwise; and there are too many instances in which, when these threats were disregarded, they were remorselessly executed by those who made them. I understand that the fifteenth amendment to the Constitution was made to prevent this and a like state of things, and the act of May 31, 1870, with amendments, was passed to enforce its provisions, the object of both being to guarantee to all citizens the right to vote and to protect them in the free enjoyment of that right. Enjoined by the Constitution “to take care that the laws be faithfully executed,” and convinced by undoubted evidence that violations of said act had been committed and that a widespread and flagrant disregard of it was contemplated, the proper officers were instructed to prosecute the offenders, and troops were stationed at convenient points to aid these officers, if necessary, in the performance of their official duties. Complaints are made of this interference by Federal authority; but if said amendment and act do not provide for such interference under the circumstances as above stated, then they are without meaning, force, or effect, and the whole scheme of colored enfranchisement is worse than mockery and little better than a crime. Possibly Congress may find it due to truth and justice to ascertain, by means of a committee, whether the alleged wrongs to colored citizens for political purposes are real or the reports thereof were manufactured for the occasion.

The whole number of troops in the States of Louisiana, Alabama, Georgia, Florida, South Carolina, North Carolina, Kentucky, Tennessee, Arkansas, Mississippi, Maryland, and Virginia at the time of the election was 4,082. This embraces the garrisons of all the forts from the Delaware to the Gulf of Mexico.