Sketchbook 1, 1889. “Sketchbook is signed and inscribed by Otto Greiner inside the front cover and the front fly-leaf. (…) The drawings are executed in pencil, red chalk, charcoal, or black ink pen on rectos and versos and the endpapers. There is a black ink drawing of a male head on the cover of sketchbook 1. The drawings are studies of foliage and plants; studies of various parts of the human body and anatomical studies of the human skeleton; sketches of human figures and horses, including a horse in harness; and sketches of various details.”