Land of Oz Patchwork Girl of Oz", Dorothy specifies that he cannot speak because he is not a fairy dog. However, in "Ozma of Oz", the chicken Billina acquires speech merely by being swept to the lands near Oz, and in "Dorothy and the Wizard in Oz", the same is true of the kitten Eureka and the cab horse Jim when reaching the land of Mangaboos, a similarly magical land. In "Tik-Tok of Oz", Baum restored the continuity: Toto can speak, and always could, but never bothered to, because it was unnecessary. An additional inconsistency is introduced with "Tik-Tok of Oz": Hank the
The Wonderful Wizard of Oz continued to include these faces on gates. Baum did not offer any conclusive proof that he intended his novel to be a political allegory. Historian Ranjit S. Dighe wrote that for 60 years after the book's publication, "virtually nobody" had such an interpretation until Henry Littlefield, a high-school teacher. In his 1964 "American Quarterly" article, "The Wizard of Oz: Parable on Populism", Littlefield posited that the book contained an allegory of the late 19th-century bimetallism debate regarding monetary policy. Littlefield's thesis achieved some support, but has been strenuously attacked by others. "The Wonderful Wizard of Oz" has become an established