MATURE READERS. Cover art by Robert Crumb. “Sunny Side Up”; Mr. Natural sings the lyrics to the popular standard “Keep Your Sunny Side Up!” (by B.G. DeSylva, Lew Brown, and Ray Henderson). “Mr. Natural’s 719th Meditation”; Mr. Natural meditates while a city rises, collapses, and turns to dust. “Om Sweet Om”; Shuman is teased by Mr. Natural to the breaking point while he’s meditating on the sidewalk. “The Origins of Mr. Natural.” “On the Bum Again”; Mr. Natural, sick of the city, heads out west. While on the train, a lady who asks him to watch her baby never comes back. Gandy Goose and Sourpuss illustration. Scripts and art by Robert Crumb. MATURE READERS. The comix underground’s most popular character, Mr. Natural, in his butt-kicking debut issue.