We are gratified in being able to offer our readers a faithful and quite full report of the speech of Hon. Jefferson Davis of Mississippi, on the occasion of the serenade given him by the citizens of Portland, without distinction of party, on Friday evening last. It will be read with interest and pleasure, and we can not doubt that every sentiment, uttered by the distinguished Mississippian, will find a hearty response and approval from the citizens of Maine. The occasion was indeed a pleasing, a hopeful one. It was in every respect the expression of generous sentiments, of kindness, hospitality, friendly regard, and the brotherhood of American citizenship. Prominent men of all parties were present, and the expression, without exception, so far as we have heard, has been that of unmingled gratification; and the scene was equally pleasant to look upon. The beautiful mansion of Rensallaer Cram, Esq., directly opposite to Madame Blanchard's, was illuminated, and the light thrown from the windows of the two houses revealed to view the large and perfectly orderly assemblage with which Park and Danforth Streets were crowded. We regret that our readers can get no idea of the musical voice and inspiring eloquence of the speaker from a report of his remarks; but it is the best we can do for them. After the music had ceased, Mr. Davis appeared upon the steps, and as soon as the prolonged applause with which he was greeted had subsided, he spoke in substance as follows: FELLOW-CITIZENS: Accept my sincere thanks for this manifestation of your kindness. Vanity does not lead me so far to misconceive your purpose as to appropriate the demonstration to myself; but it is not the less gratifying to me to be made the medium through which Maine tenders an expression of regard to her sister, Mississippi. It is, moreover, with feelings of profound gratification that I witness this indication of that national sentiment and fraternity which made us, and which alone can keep us, one people. At a period but as yesterday, when compared with the life of nations, these States were separate, and, in some respects, opposing colonies, their only relation to each other was that of a common allegiance to the Government of Great Britain. So separate, indeed almost hostile, was their attitude, that when General Stark, of Bennington memory, was captured by savages on the headwaters of the Kennebec, he was subsequently taken by them to Albany, where they went to sell furs, and again led away a captive, without interference on the part of the inhabitants of that neighboring colony to demand or obtain his release. United as we now are, were a citizen of the United States, as an act of hostility to our country, imprisoned or slain in any quarter of the world, whether on land or sea, the people of each and every State of the Union, with one heart and with one voice, would demand redress, and woe be to him against whom a brother's blood cried to us from the ground. Such is the