After combing through McKeithan's "Traveling with the Innocents Abroad"
I'm wondering about the apparently missing letters: 40, 41, 42, 49, and
50.  In truth I was only examining the end notes he provides for each
of his chapters, which do seem to correspond to specific individual
letters (including those to the New York Tribune).  These are letter
numbers assigned by Twain and I suppose he could have mis-counted or
discarded and not sent numbered letters.
-- 
 There are more things in heaven and earth, Horatio, than are dreamt of
                          in your philosophy.
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