[41] He retained his English citizenship until Natchez passed into the possession of the United States, when he took the oath of allegiance to this government. [42] Sixteen letters from Gayoso to Dunbar are now in the possession of Mrs. George T. Green, of Natchez, Miss. [43] March 9, 1787. [44] Letter written at New Orleans, Dec. 20, 1797. [45] Letter written at New Orleans, May 12, 1798. [46] This was the limit of the cultivated lands at that time. [47] Transactions of the American Philosophical Society. V., 216, Footnote. [48] They separated ten miles east of the point of starting. [49] Manuscript copy of Dunbar's Report, presented to the writer by Major William Dunbar Jenkins, of Natchez, Miss. [50] Transactions of the Amer. Phil. Soc. V., 203. [51] Ellicott's Journal, (1803) 56. [52] See Publication of the Amer. Hist. Association for 1897, 181, Footnote; Publication, Miss. Hist. Soc. for 1898, 55, Footnote. [53] This letter was written at New Orleans, Feb. 12, 1799. It is found in the Manuscript Correspondence of Thomas Jefferson in the archives of the State Department, Washington, D. C. [54] The exact title of this report is: "Account of the Commencement and Progress of the First 18 Miles of the Line of Demarcation, beginning at the River Mississippi and proceeding East along the most northerly part of the 31st degree of North lat. between the Territories of Spain and the United States of America, concluding with Observations and Remarks on the Country, its Climate, Production, &c., by William Dunbar." [55] Natchez Democrat of September 10, 1873. [56] He here refers to a conflict between the theories of Bernardin de St. Pierre and Sir Isaac Newton respecting the nature of the rainbow and claims that this phenomenon demonstrates the correctness of the latter. [57] Pages 421-434. [58] Letter in the possession of Mrs. George F. Green of Natchez, Miss. [59] A fortnight later, he wrote that he had failed to reanimate what he had supposed to be bivalves in this water. In fact, he was mistaken in his supposition, as has been shown by subsequent analyses. [60] "The following is a list of articles ordered by Dunbar from John Swift, London: 1 Pocket Chronometer, 30 guineas. 1 Telescope, £150. 1 Astronomical Circle, £100. 1 Parallel Ruler. 1 Brass Sextant and Stand, 20 guineas. 1 Improved Astronomical Telescope. 1 Hair Compass. 1 Bow Compass. 1 Pneumatic Apparatus. 1 Electrical Machine with apparatus for philosophical and medical uses.