In the absence of Mr. Adams, it becomes my duty to communicate, for the information of our government, the result of the investigation at Dartmoor. I enclose a copy of the joint report of the commissioners appointed for that purpose, also of a letter from Mr. King to Mr. Adams, and of a list of the killed and wounded on that melancholy occasion. I shall leave to Mr. Adams any further steps which he may deem it proper to take in this business. I cannot, however, forbear to notice the erroneous impression of the prisoners, that their detention so long has been owing to me. You are aware, sir, of my constant exertions during the war to effect their liberation. I immediately, on the signing of the treaty of peace at Ghent, renewed my instances on that subject; proposing, as a condition, that all prisoners who might be delivered over to me by the British government, should be considered as prisoners of war, and not at liberty to serve until regularly exchanged, in the event of the treaty not being ratified by the President. This proposition was declined, and in a peremptory manner. On the receipt of the intelligence of the ratification from America, I lost not a moment in requesting the release of the prisoners, according to the terms of the treaty; and the number of vessels which I had hired, as mentioned in my letter of the 13th, and which are now on their voyage to the United States, will show that the necessary steps were taken to provide for their immediate transportation to their country. The prisoners also were informed of these measures, and of the exertions which had been made from the commencement, to return them to their homes with the least possible delay. Therefore, whatever may have been their uneasiness, under confinement, and whatever hostile feelings they may have had towards me, as noticed in the report, and in Mr. King’s letter, I must say, with confidence, that I could not prevent the one, nor have I deserved the other. I have the honor to be, sir, your most obedient humble servant, R. G. BEASLEY. The Hon. JOHN MASON, &c. &c. [From the Plymouth (Eng.) Telegraph, April 22, 1815.] _To the Editor_: SIR, The officers and prisoners of this depot, feeling an ardent desire that the citizens of the United States may be informed of the many and great services rendered them by Dr. Magrath, and likewise that the subjects of Great Britain may learn with what sentiments of gratitude and respect his unparalleled efforts in the cause of humanity, and the discharge of his duty, have, at this depot, filled us; we have to request that you will cause to be inserted in your paper, as early as possible, copies of the enclosed testimonials, addressed to that gentleman. I am, &c., BENJAMIN MERCER. HOSPITAL, April 13, 1815.