Note 7 — Chapter VI
Reading edition
From the data, above given, the descent of the Mississippi, will average a fraction over five inches, per mile, a result not essentially different from that furnished by the data, which I submitted in my Narrative Journal in 1820, but which was differently stated from haste and inadvertence. For a prompt notice of the error, I feel indebted to Hamilton Fulton, Esqr., who, soon after the appearance of the work, wrote to my publishers, on the subject.