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", was published in 1890. The book reused the eighteen line drawings that had appeared in the "Scribner's" article and also seventeen reproductions using the halftone method, and thus " the first extensive use of halftone photographic reproductions in a book". (The magazine "Sun and Shade" had done the same for a year or so beginning 1888.)