Hercules and the Hydra of Lerna
1866 · Pen and brown and black ink and graphite, with touches of brush and brown wash, heightened with lead white, discolored, on cream laid paper prepared with a pale brown wash, tipped on blue laid paper, laid down on cream board
18.3 × 15.8 cm (7 1/4 × 6 1/4 in.)
Art Institute of Chicago