This can all be seen in Twain's nonfictional essay, titled, "William Dean Howells," which is, very appropriately, about William Dean Howells, a fellow writer of the realism genre, much like Twain himself.
Twain’s essay, even just in prosody, is very unlike that of Howell’s writing. Twain writes very colloquially and with a very easy-to-understand level of diction and sentence structures. Howells, on the other hand, is known for writing deep, eloquent sentences that, to a modern reader, may not be the easiest to understand.
Howells' and James' letters