Having received satisfactory evidence that discriminating tonnage duties were charged upon the vessels of the United States in the ports of Portugal, a proclamation was issued on the 11th day of October last, in compliance with the act of May 25, 1832, declaring that fact, and the duties on foreign tonnage which were levied upon Portuguese vessels in the United States previously to the passage of that act are accordingly revived. The act of July 4, 1836, suspending the discriminating duties upon the produce of Portugal imported into this country in Portuguese vessels, was passed, upon the application of that Government through its representative here, under the belief that no similar discrimination existed in Portugal to the prejudice of the United States. I regret to state that such duties are now exacted in that country upon the cargoes of American vessels, and as the act referred to vests no discretion in the Executive, it is for Congress to determine upon the expediency of further legislation on the subject. Against these discriminations affecting the vessels of this country and their cargoes seasonable remonstrance was made, and notice was given to the Portuguese Government that unless they should be discontinued the adoption of countervailing measures on the part of the United States would become necessary; but the reply of that Government, received at the Department of State through our charge d'affaires at Lisbon in the month of September last, afforded no ground to hope for the abandonment of a system so little in harmony with the treatment shown to the vessels of Portugal and their cargoes in the ports of this country and so contrary to the expectations we had a right to entertain. With Holland, Sweden, Denmark, Naples, and Belgium a friendly intercourse has been uninterruptedly maintained. With the Government of the Ottoman Porte and its dependencies on the coast of the Mediterranean peace and good will are carefully cultivated, and have been fostered by such good offices as the relative distance and the condition of those countries would permit. Our commerce with Greece is carried on under the laws of the two Governments, reciprocally beneficial to the navigating interests of both; and I have reason to look forward to the adoption of other measures which will be more extensively and permanently advantageous. Copies of the treaties concluded with the Governments of Siam and Muscat are transmitted for the information of Congress, the ratifications having been received and the treaties made public since the close of the last annual session. Already have we reason to congratulate ourselves on the prospect of considerable commercial benefit; and we have, besides, received from the Sultan of Muscat prompt evidence of his desire to cultivate the most friendly feelings, by liberal acts toward one of our vessels, bestowed in a manner so striking as to require on our part a grateful acknowledgment.