A close reading of Phipp's book shows he may have hedged his bets on the
book _Psalms and Hymns_ (1843) when he stated it was "probably" the book
that most influenced Mark Twain, second to the Bible.  It is unclear if
"probably" refers to the actual book or the actual influence. Nothing
definite. (Phipps, p. 22). Unfortunately, Phipps died in 2010, so it's
impossible to ask him for a clarification.

Terrell Dempsey does have an indepth discussion about what was going on in
Hannibal between the "old" and "new" schools of religious thought and it
was a complicated political/religious situation much of it revolving around
the slavery issue.  Dempsey does not discuss old and new hymn books.

Regarding hymn books -- it would be interesting to make a side-by-side
comparison between the two hymnals to determine what hymns might have been
deleted and what might have been added.  The question also arises -- Did
Jane Clemens keep a copy of any discarded "old" hymnals? Especially if she
was ambivalent about the "new" directions.

Barb