The Board of Engineers were also directed to examine and survey the entrance of the harbor of the port of Presqu'isle, in Pennsylvania, in order to make an estimate of the expense of removing the obstructions to the entrance, with a plan of the best mode of effecting the same, under the appropriation for that purpose by act of Congress passed 3rd of March last. The report of the Board accompanies the papers from the War Department, and is submitted for the consideration of Congress. A strong hope has been long entertained, founded on the heroic struggle of the Greeks, that they would succeed in their contest and resume their equal station among the nations of the earth. It is believed that the whole civilized world take a deep interest in their welfare. Although no power has declared in their favor, yet none according to our information, has taken part against them. Their cause and their name have protected them from dangers which might ere this have overwhelmed any other people. The ordinary calculations of interest and of acquisition with a view to aggrandizement, which mingles so much in the transactions of nations, seem to have had no effect in regard to them. From the facts which have come to our knowledge there is good cause to believe that their enemy has lost forever all dominion over them; that Greece will become again an independent nation. That she may obtain that rank is the object of our most ardent wishes. It was stated at the commencement of the last session that a great effort was then making in Spain and Portugal to improve the condition of the people of those countries, and that it appeared to be conducted with extraordinary moderation. It need scarcely be remarked that the result has been so far very different from what was then anticipated. Of events in that quarter of the globe, with which we have so much intercourse and from which we derive our origin, we have always been anxious and interested spectators. The citizens of the United States cherish sentiments the most friendly in favor of the liberty and happiness of their fellow men on that side of the Atlantic. In the wars of the European powers in matters relating to themselves we have never taken any part, nor does it comport with our policy so to do. It is only when our rights are invaded or seriously menaced that we resent injuries or make preparation for our defense. With the movements in this hemisphere we are of necessity more immediately connected, and by causes which must be obvious to all enlightened and impartial observers. The political system of the allied powers is essentially different in this respect from that of America. This difference proceeds from that which exists in their respective Governments; and to the defense of our own, which has been achieved by the loss of so much blood and treasure, and matured by the wisdom of their most enlightened citizens, and under which we have enjoyed unexampled felicity, this whole nation is devoted.