Harper’s, Mother Jones, and Spy. The ads were for a poster you could buy for $8.95, plus $2 shipping and handling—“a lithograph of rare quality suitable for framing and display.” The copy promised that the poster would “provide many hours of fascination and enjoyment,” whether it was used “as an education resource, a decoration for home or office, or a unique gift.” Sold by Scientific Novelty Co., of Bloomington, Indiana, the poster depicted the relative lengths and girths of a dozen different animal penises. “Penises of the Animal Kingdom” was the masterwork of a man named Jim Knowlton, and his poster offered exactly what its title promised: a dozen hand-drawn penises, with the names of the animals they belonged to and arranged by size, from largest penis to smallest—sperm whale, elephant, giraffe, bull, horse, pig, porpoise, ram, goat, hyena, dog, and, finally, human. (The lengths were drawn to scale, which suggests that the specimen chosen for the dog penis was from a relatively large breed.)