John Breck Treat's meteorological observations for 1805-1808 contain information on the temperature, barometer, rainfall, and general observations for Arkansas in the recently acquired Louisiana Territory. Treat sent this volume to Thomas Jefferson in 1809 from "Arkansa in Louisiana," and wrote, "If from their perusal you can derive, either information or amusement, respecting the climate of this part of our country, your acceptance will be highly gratifying."
