Distinct Traces of Lunar Inhabitants, Especially of One of Their Colossal Buildings". Gruithuisen claimed to have observed various shades of color on the lunar surface, which he correlated with climate and vegetation zones. He also observed lines and geometrical shapes, which he felt indicated the existence of walls, roads, fortifications, and cities. However, a more direct object of Locke's satire was Rev. Thomas Dick, who was known as "The Christian Philosopher" after the title of his first book. Dick had computed that the Solar System contained 21,891,974,404,480 (21.9 trillion) inhabitants. In fact, the Moon alone, by his count, would contain 4,200,000,000 inhabitants. His writings were enormously popular in the United States; intellectual Ralph Waldo Emerson was one of his fans. Reactions According to legend, The Suns circulation increased dramatically because of the hoax and remained permanently greater than before, thereby establishing The Sun as a successful paper. However, the degree to which the hoax increased the paper's circulation has certainly been exaggerated in popular accounts of the event. It was not discovered to be a hoax for several weeks after its publication and, even then, the newspaper did not issue a retraction. Herschel was initially amused by the hoax, noting that his own real observations could never be as exciting. He later became annoyed when he had to answer questions from people who believed the hoax was serious. Edgar Allan Poe claimed the story was a plagiarism of his earlier work "The Unparalleled Adventure of One Hans Pfaall". His editor at the time was Richard Adams Locke. He later published "The Balloon-Hoax" in the same newspaper. Poe had published his own Moon hoax in late June 1835, two months before the similar Locke Moon hoax, in the Southern Literary Messenger entitled "Hans Phaall – A Tale", later republished as "The Unparalleled Adventure of One Hans Pfaall". The story was reprinted in the New York Transcript on September 2–5, 1835, under the headline "Lunar Discoveries, Extraordinary Aerial Voyage by Baron Hans Pfaall". Poe described a voyage to the Moon in a balloon, in which Pfaall lives for five years on the Moon with lunarians and sends back a lunarian to earth. The Poe Moon hoax was less successful because of the satiric and comical tone of the account. Locke was able to upstage Poe and to steal his thunder. In 1846, Poe would write a biographical sketch of Locke as part