Envisaging the West: Thomas Jefferson and the Roots of Lewis and Clark

March 12, 1791 | Letter Thomas Jefferson to William Carmichael, March 12, 1791 Tension along the Mississippi River worries Thomas Jefferson, who asks William Carmichael to clarify the position of the Spanish regarding navigation of the Mississippi below the mouth of the Ohio River.

February 12, 1799 | Letter Daniel Clark to Thomas Jefferson, February 12, 1799 Daniel Clark, of New Orleans, writes to Thomas Jefferson on behalf of Philip Nolan, promising a summary of Nolan's information and impressions about New Mexico and the Louisiana Territory. Clark also uses the letter to introduce Jefferson to the work of William Dunbar.

June 24, 1799 | Letter Thomas Jefferson to William Dunbar, June 24, 1799 Thomas Jefferson writes his first letter to William Dunbar, who had been recommended to him by Daniel Clark. Jefferson asks Dunbar for information on the land and inhabitants of the "regions beyond" the Mississippi River, making particular note of the importance of recording the languages of indigenous peoples as a means to understanding their origins.

January 16, 1800 | Letter Thomas Jefferson to William Dunbar, January 16, 1800 Thomas Jefferson writes to William Dunbar, thanking him for promised communications about Native languages from Western groups and meteorological observations that may be used in comparative studies. Reports from Dunbar were read at the American Philosophical Society and several appear in the "Reports" section of this archive.

June 30, 1800 | Report William Dunbar to the American Philosophical Society, via Thomas Jefferson, read January 16, 1801. This letter, with several other missives and reports written by Dunbar, were forward by Jefferson to the American Philosphical Society, where they were read before the Society and later published in theTransactions of the Philosophical Society of Americain 1804. Dunbar describes the sign language used by Native Americans between the Mississippi River and the "Western American ocean."

December 16, 1800 | Letter Thomas Jefferson to Caspar Wistar, December 16, 1800 Thomas Jefferson introduces Caspar Wistar to the work of William Dunbar, excited at the prospect of a scientific correspondent "on the very verge of the great terra incognita of our western continent."

January 12, 1801 | Letter Thomas Jefferson to William Dunbar, January 12, 1801 Thomas Jefferson acknowledges William Dunbar's July 14, 1800 letter and enclosures; he also touches on other scientific matters and expresses his satisfaction at having a scientific correspondent on the western edge of the country.

August 22, 1801 | Report William Dunbar to the American Philosophical Society, via Thomas Jefferson, read December 18, 1801. This report, with several other missives and reports written by Dunbar, were forwarded by Jefferson to the American Philosphical Society, where they were read before the Society and later published in theTransactions of the Philosophical Society of Americain 1804. Dunbar's detailed descriptions of the weather and growing conditions in Lousiana were sure to interest Jefferson.

August 22, 1801 | Letter William Dunbar to Thomas Jefferson, August 22, 1801 William Dunbar writes to Thomas Jefferson of scientific matters, including the properties of rainbows. Dunbar anticipates fossil finds west of the Mississippi River, based on information forwarded by the late Philip Nolan. This letter, with several other missives and reports written by Dunbar, were forward by Jefferson to the American Philosphical Society, where they were read before the Society and later published in theTransactions of the Philosophical Society of Americain 1809. See the "Reports" section of this archive.

March 14, 1803 | Letter Albert Gallatin to Thomas Jefferson, March 14, 1803 Albert Gallatin informs Thomas Jefferson of the preparations he has made for the Corps of Discovery expedition, including commissioning Nicholas King's blank projection of western North America. Gallatin demonstrates his familiarity with the work of cartographers including Arrowsmith, Delisle, and Mackenzie, assuming Jefferson has the same background knowledge.

October 21, 1803 | Letter William Dunbar to Thomas Jefferson, October 21, 1803 William Dunbar responds to Thomas Jefferson's September 21 letter regarding the Spanish presence in Florida and the Gulf Coast and the surveys conducted by the Spanish in that region. He also praises Daniel Clark's summation of the population of the Lousiana Territory and suggests a representative from that region appear before Congress, but notes that the Spanish government is unlikely to allow such a measure to take place as long as the territory is in their hands.

October 21, 1803 | Letter William Dunbar to Thomas Jefferson, October 21, 1803 William Dunbar writes to Thomas Jefferson regarding the Spanish presence in Florida and the Gulf Coast and the surveys conducted by the Spanish in that region. He also praises George Rogers Clark's summation of the population of the Lousiana Territory and suggests a representative from that region appear before Congress, but notes that the Spanish government is unlikely to allow such a measure to take place as long as the territory is in their hands.

November 16, 1803 | Letter Thomas Jefferson to Meriwether Lewis, November 16, 1803 Thomas Jefferson updates Meriwether Lewis on political activity around the event of the Louisiana Purchase. Jefferson includes notes from the explorer Truteau that detail population and activities of some native groups living west of the Mississippi.

January 28, 1804 | Letter William Dunbar to Thomas Jefferson, January 28, 1804 William Dunbar sends notes to Jefferson concerning the Mississippi River Valley; he believes the notes could be read before the Philosphical Society; see the "Reports" section of this archive for several of Dunbar's dispatches on the Mississippi River region. Dunbar continues with a discussion of the development of Natchez and the establishment of a college there.

March 13, 1804 | Letter Thomas Jefferson to William Dunbar, March 13, 1804 Thomas Jefferson thanks William Dunbar for his letter of January 28, promising to forward his paper on the Mississippi River to the American Philosophical Society. Jefferson then writes a detailed discussion of the science of water in a river like the Mississippi. Jefferson also relates his plans for directing surveying parties to the Mississippi and Ohio Rivers, in addition to explorations of the Red and other more southern waterways. Jefferson concludes with speculations on the future of the Lousiana Territory.

April 6, 1804 | Report William Dunbar to the American Philosophical Society, via Thomas Jefferson, read April 6, 1804. The Mississippi River, its delta, and the surrounding region receive detailed attention from William Dunbar in this report forwarded to the APS by Thomas Jefferson.

May 13, 1804 | Letter William Dunbar to Thomas Jefferson, May 13, 1804 William Dunbar thanks Thomas Jefferson for his comments about Dunbar's notes on the Mississippi River. Spain's land sales in Western Florida draw the author's attention and Dunbar offers approval of continuing explorations on America's western rivers, while bemoaning Congress' reluctance to adequately fund such expeditions.