SIR,--I have had the honour to receive your Excellency's dispatch, marked confidential, of the 18th instant, in answer to mine of the 8th, which was delivered to me this morning, the contents of which will cause great satisfaction to her Majesty's Government, as to me they have procured the highest gratification. Her Majesty's Ministers will see, in the determination of the Monte Videan Government to conclude a Treaty of Amity, Commerce, and Navigation, with Great Britain, on the terms proposed by Mr. Hamilton and by me, the most unequivocal proof of the loyalty of its intentions towards the British Empire, and of its friendly sentiments towards her Majesty's Government. I shall, in consequence, avail myself of the friendly dispositions of the Monte Videan Government for the adjustment and conclusion of the treaty which your Excellency has done me the honour to communicate to me, and I propose, in a few days, to embark for Monte Video, for the termination of so honourable and desirable an event. I have the honour to be, with the highest consideration, Sir, Your Excellency's obedient humble servant, J. H. MANDEVILLE. _To his Excellency D. Jose Antonino Vidal, &c. &c. &c._ * * * * * (PRIVATE.) _Buenos Ayres, June 24th, 1842._ MY DEAR M. DE VIDAL,--I have received your two most amiable and friendly letters of the 18th and 20th instant; it is needless for me to tell you the delight and gratification which they have procured to me. I have little more to add to my acknowledgement of the receipt of these letters, as I shall so very soon have, God willing, the satisfaction of seeing you, except to renew to my heartfelt thanks for their contents, which only serve to increase the sentiments of friendship and esteem which your conduct to me has inspired me with, since the first day of our personal acquaintance. I reserve all communications upon any other subject until we meet, which will be about the middle of next week, but rely upon it, and it is with pride I tell you, _you and your Government will be satisfied_. Believe me ever, my dear M. de Vidal, with the highest regard and consideration, Most faithfully yours, J. H. MANDEVILLE. * * * * * (CONFIDENTIAL.) _Buenos Ayres, June 25th, 1842._ MY DEAR M. DE VIDAL,--Would you have any objections to have the treaty copied immediately? I have motives so strong not for coming back to Buenos Ayres, but for being able to return at the moment when it becomes necessary, that I should impart them to you, which I cannot well by this conveyance. I will answer for your concurrence with me in this desire to be ready, at a moment's notice, to come back here.