I've been working on my Roughing It videos and lessons and came across
discussions of sawyers as nuisances to navigation.  In these instances
they referred to the Missouri rather than the Mississippi.  I was just
thinking that the thought of them being nuisances might have inspired
Twain to name his most popular nuisance Sawyer, Tom Sawyer.

-- 
 There are more things in heaven and earth, Horatio, than are dreamt of
                          in your philosophy.
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