It is due to the character of our institutions that the diplomatic intercourse of this Government should be conducted with the utmost directness and simplicity, and that in all cases of importance the communications received or made by the Executive should assume the accustomed official form. It is only by insisting on this form that foreign powers can be held to full responsibility, that their communications can be officially replied to, or that the advice or interference of the Legislature can with propriety be invited by the President. This course is also best calculated, on the one hand, to shield that officer from unjust suspicions, and on the other to subject this portion of his acts to public scrutiny, and, if occasion shall require it, to constitutional animadversion. It was the more necessary to adhere to these principles in the instance in question inasmuch as, in addition to other important interests, it very intimately concerned the national honor--a matter in my judgment much too sacred to be made the subject of private and unofficial negotiation. It will be perceived that this letter of the French minister of foreign affairs was read to the Secretary of State on the 11th of September last. This was the first authentic indication of the specific views of the French Government received by the Government of the United States after the passage of the bill of indemnification. Inasmuch as the letter had been written before the official notice of my approval of Mr. Livingston's last explanation and remonstrance could have reached Paris, just ground of hope was left, as has been before stated, that the French Government, on receiving that information in the same manner as the alleged offensive message had reached them, would desist from their extraordinary demand and pay the money at once. To give them an opportunity to do so, and, at all events, to elicit their final determination and the ground they intended to occupy, the instructions were given to our chargé d'affaires which were adverted to at the commencement of the present session of Congress. The result, as you have seen, is a demand of an official written expression of regrets and a direct explanation addressed to France with a distinct intimation that this is a _sine qua non_. Mr. Barton having, in pursuance of his instructions, returned to the United States and the chargé d'affaires of France having been recalled, all diplomatic intercourse between the two countries is suspended, a state of things originating in an unreasonable susceptibility on the part of the French Government and rendered necessary on our part by their refusal to perform engagements contained in a treaty from the faithful performance of which by us they are to this day enjoying many important commercial advantages.