As an additional proof of the sentiments which animate the Prince Regent on this occasion, I am further commanded to express his Royal Highness' desire to make a compensation to the widows and families of the sufferers; and I have to request that you, gentlemen, would make this known to your government, inviting them, at the same time, to co-operate with his majesty's charge d'affairs in the United States, in investigating the respective claims, for the purpose of fulfilling his Royal Highness' benevolent intentions upon this painful occasion. I request that you will accept the assurance of the distinguished consideration with which I have the honor to be, &c. (Signed) CASTLEREAGH. To Henry Clay, Esq. and Albert Gallatin, Esq. _Copy of a letter from Messrs. Clay and Gallatin, to Lord Castlereagh._ Hanover Street, Hanover Square, March 24, 1815. MY LORD--We have the honor to acknowledge the receipt of your lordship's official note of the 22d inst. Having, as we have already informed your lordship, no powers on the subject to which it refers, we will lose no time in transmitting it to our government.--We will also place in the possession of the American minister, near his Britannic majesty's government, whose arrival here we daily expect, a copy of your lordship's note, together with a statement of what had previously passed respecting the unfortunate event at Dartmoor. We embrace the opportunity of tendering, &c. (Signed) H. CLAY, ALBERT GALLATIN. The Right Honorable Viscount Castlereagh, Secretary of State for the Foreign Department, &c. &c. _The Secretary of State to Anthony St. John Baker, Esq. his Britannic majesty's charge d'affairs._ Washington, Department of State, December 11, 1815. SIR--I have the honor to receive your letter of the 3d of August, communicating a proposition of your government to make provision for the widows and families of the sufferers in the much to be lamented occurrence at Dartmoor. It is painful to touch on this unfortunate event, from the deep distress it has caused to the whole American people. This repugnance is increased by the consideration that our governments, though penetrated with regret, do not agree in sentiment, respecting the conduct of the parties engaged in it. Whilst the President declines accepting the provision contemplated by his royal highness, the Prince Regent, he nevertheless does full justice to the motives which dictated it. I have the honor to be, &c. (Signed) JAMES MONROE.