Preparations are making for the international exposition to be held during the next year in Vienna, on a scale of very great magnitude. The tendency of these expositions is in the direction of advanced civilization, and of the elevation of industry and of labor, and of the increase of human happiness, as well as of greater intercourse and good will between nations. As this exposition is to be the first which will have been held in eastern Europe, it is believed that American inventors and manufacturers will be ready to avail themselves of the opportunity for the presentation of their productions if encouraged by proper aid and protection. At the last session of Congress authority was given for the appointment of one or more agents to represent this Government at the exposition. The authority thus given has been exercised, but, in the absence of any appropriation, there is danger that the important benefits which the occasion offers will in a large degree be lost to citizens of the United States. I commend the subject strongly to your consideration, and recommend that an adequate appropriation be made for the purpose. To further aid American exhibitors at the Vienna Exposition, I would recommend, in addition to an appropriation of money, that the Secretary of the Navy be authorized to fit up two naval vessels to transport between our Atlantic cities and Trieste, or the most convenient port to Vienna, and back, their articles for exhibition. Since your last session the President of the Mexican Republic, distinguished by his high character and by his services to his country, has died. His temporary successor has now been elected with great unanimity by the people a proof of confidence on their part in his patriotism and wisdom which it is believed will be confirmed by the results of his administration. It is particularly desirable that nothing should be left undone by the Government of either Republic to strengthen their relations as neighbors and friends. It is much to be regretted that many lawless acts continue to disturb the quiet of the settlements on the border between our territory and that of Mexico, and that complaints of wrongs to American citizens in various parts of the country are made. The revolutionary condition in which the neighboring Republic has so long been involved has in some degree contributed to this disturbance. It is to be hoped that with a more settled rule of order through the Republic, which may be expected from the present Government, the acts of which just complaint is made will cease. The proceedings of the commission under the convention with Mexico of the 4th of July, 1868, on the subject of claims, have, unfortunately, been checked by an obstacle, for the removal of which measures have been taken by the two Governments which it is believed will prove successful.