Washington May 4. 1806.
Being near my departure for Monticello I leave here with orders to forward them to you by the first vessel, a box containing the minerals from Capt. Lewis which were the subject of a former letter, & another containing an instrument called a Bathometer sent to me by it’s inventor. believing it cannot be otherwise so well disposed of, I beg leave to deposit it with the Philosophical society with whom it will have the best chance of becoming useful. Accept my friendly salutations & assurances of respect.
P.S. I send under another cover by post the treaty of mr Luïscius explaining the Bathometer.