Preparatory study of drapery for the Angel in the `Virgin of the Rocks`, 1472-c1519 (1883). Done with the brush and Indian ink on greenish paper, the lights heightened with white. From The Literary Works of Leonardo Da Vinci, Vol. 1 by Jean Paul Richter, PH. DR. [Sampson Low, Marston, Searle & Rivington, London, 1883].