On this day in Lewis & Clark history...
Lewis gives the crew a day to rest and re-supply at Wheeling, (West) Virginia. He writes a letter to President Jefferson and meets with a doctor, William Patterson. If the doctor can be ready by 3pm tomorrow, he can join the Expedition.
From the journals...
I here also met with Dr. Patterson the son of the professor of mathematicks in the University of Philada. he expressed a great desire to go with me I consented provided he could get ready by three the next evening he thought he could and instantly set about it;
the Dr. was to have taken his medicine with him which was a small as sortment of about 100 L value.
Picture from The Navigator: Or, the Trader's Useful Guide in Navigating the Monongehela, Allegheny, Ohio and Mississippi Rivers by Zadok Cramer, Fifth Edition, published in 1806. Lewis used an earlier edition to help him navigate and describe the journey down the Ohio River.