SIR: In these letters, I have endeavored to repress all party feeling, thinking it a duty, in a contest with a foreign nation, in time of actual war, to take the side of my country, unless so grossly and palpably in the wrong, as to admit of no justification or defence. I repeat, that it is my sincere conviction, that justice is on our side, and this after as full, and dispassionate an examination of the subject as I am able to bestow. The contrary, is generally assumed, or taken for granted, by the party to which I belong; and yet the speech of Mr. Webster, at Philadelphia, which expresses the same opinion, is highly applauded. He condemns the administration of Mr. Polk, (not the cause of the country,) solely on the ground of bringing on a state of actual hostilities, without the previous approbation of Congress, while he admits, that Mexico is in the wrong in the causes which led to it the annexation of Texas. But the act of the President, is a domestic question between him and American people. The causes previously existing, and which would have justified Congress in making war, constitute a different question from that of expediency, or of the distribution of powers, under the Constitution. He concedes, that if the constituted authorities of the Union had thought proper to resort to this course, there was ample cause to justify it. To this, I assent, and will endeavor to give the reasons on which my opinion is founded, according to my view of the subject; professing, at the same time, a sincere respect for the opinion of those who may differ from me. I admit that the march from the Nueces to the Rio Grande, had the effect of _hastening_ hostilities; but, in my opinion, it did do more than hasten, for the appeal of arms was inevitable on the annexation of Texas, unless Mexico receded entirely from the ground she had taken; of which, I did not see the slightest probability, unless compelled to do so, by the consequences of war, whether begun by her or by us.