The Battle of Prague was a popular piece of music during the late 18th and 19th centuries, with Mark Twain mentioning the piece in his books Adventures of Huckleberry Finn and A Tramp Abroad.
Reverend Joseph Hopkins Twichell (November 30, 1838 - December 20, 1918), writer and pastor, was Mark Twain's closest friend for over forty years, and appears in A Tramp Abroad as "Harris."
In his 1880 travelogue A Tramp Abroad, Mark Twain called the Venus of Urbino "the foulest, the vilest, the obscenest picture the world possesses".
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Mark Twain also visited Rigi during his tour of Central Europe in the late 1870s, and wrote about his travels in his "A Tramp Abroad."
Jerome would have been aware of Mark Twain's humorous travelogue, A Tramp Abroad (1880), based on a walking tour through similar parts of Germany, with extensive comments on the language and culture.