plate holders, a tripod and equipment for developing and printing. He took the equipment to the potter's field cemetery on Hart Island to practice, making two exposures. The result was seriously overexposed but successful. For three years, Riis combined his own photographs with others commissioned of professionals, donations by amateurs and purchased lantern slides, all of which formed the basis for his photographic archive. Because of the nighttime work, he was able to photograph the worst elements of the New York slums, the dark streets, tenement apartments, and "stale-beer" dives, and documented the hardships faced by the poor and criminal, especially in the vicinity of notorious Mulberry Street. Public speaking Riis accumulated a supply of photography and attempted to submit illustrated essays to magazines. But when an editor at Harper's New Monthly Magazine said that he liked the photographs but not the writing, and would find another writer, Riis was despondent about magazine publication and instead thought of speaking directly to the public. This was not easy. The obvious venue would be a church, but several churches—including Riis's own—demurred, fearing either that the talks would offend the churchgoers' sensibilities or that they would offend rich and powerful landlords. However, Adolph Schauffler (of the City Mission Society) and Josiah Strong arranged to sponsor Riis's lecture at the Broadway Tabernacle church. Lacking money, Riis partnered with W. L. Craig, a Health Department clerk. Riis and Craig's lectures, illustrated with lantern slides, made little money for the pair, but they both greatly increased the number of people exposed to what Riis had to say and also enabled him to meet people who had the power to effect change, notably Charles Henry Parkhurst and an editor of Scribner's Magazine, who invited him to submit an illustrated article. Books An eighteen-page article by Riis, How the Other Half Lives, appeared in the Christmas 1889 edition of Scribner's Magazine. It included nineteen of his photographs rendered as line drawings. Its publication brought an invitation to expand the material into an entire book. Riis, who favored Henry George's 'single tax' system and absorbed George's theories and analysis, used that opportunity to attack landlords "with Georgian fervor". Riis had already been thinking of writing a book and began writing it during nights. (Days were for reporting for the New York Sun, evenings for public speaking.) How the Other Half Lives, subtitled "Studies Among the Tenements of New York",