May 31 Lewis spends the evening with Governor Mckean.May 29 Lewis writes to Jefferson: most articles are purchased Patterson has been busy for days no time to study sends sketches from Vancouver maps.May 24 Lewis has a “conference” with Mahlon Dickerson.May 19 Lewis dines with Henry Sheaff, a Philadelphia merchant.Benjamin Rush writes a list of questions about Indians for Lewis. George Logan, visits Governor John Mckean. May 16 Jefferson writes to Lewis, encloses a draft of his instructions about the Expedition.May 14 Ellicott writes to Jefferson – he has talked to Patterson and Henry Voigt about instruments.May 12 Lewis dines with his long-time friend, Mahlon Dickerson.May 10 Lewis starts training in Philadelphia: Barton-botany, Patterson-navigation, math, Rush-medicine, Wistar-anatomy.May 7 Ellicott writes to John Vaughn and Robert Patterson, letters to be carried by Lewis.May-June Lewis is in Philadelphia purchasing equipment and studying with various experts.April 30 American and French delegates initial the Louisiana Purchase Treaty.April 20 Lewis begins practice in celestial navigation with Ellicot.April 19 Lewis arrives at Lancaster, Pennsylvania, calls on Andrew Ellicott, astronomer, mathematician, and surveyor.Comments on the draft of Jefferson’s instructions to Lewis. April 13 Gallatin writes to Jefferson.March 19 Lewis arrives at Harpers Ferry to arrange for supplies.for the federal armory at Harpers Ferry, Virginia. March 15 Meriwether Lewis leaves Washington, D.C.March 14 Gallatin writes to Jefferson with two things of note: 1) He has issued a warrant for $2,500 for the Expedition and 2) he mentions a “manuscript transcribed from Mr.March 1 Meriwether Lewis’ French passport is issued.February 28 Meriwether Lewis’ British passport is issued.
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February 28 Jefferson writes to Wistar that Lewis has learned how to calculate latitude and longitude.February 27 Jefferson writes to Barton indicating that he has appointed Meriwether Lewis to head the Expedition to the Pacific.January 18 President Jefferson sends encrypted letter to Congress seeking funding for a proposed expedition.Later, Spain declines to issue Lewis a passport. December 2 Spanish minister Irujo writes to Madrid, says Jefferson asked him if Spain would object to a scientific expedition up the Missouri River.
November 21 Secretary of Treasury, Albert Gallatin letter received by Jefferson, advising him to make a secret request to Congress to fund the Expedition, rather than a part of his annual message to Congress.Summer or Fall 1802 Jefferson informs Lewis that he would be in command of an Expedition to the Pacific.