Geological Sketches, Bird's Skull

Watercolor and gouache on white paper mounted on very fine canvas, formerly attached to stretcher

Black ink and graphite on off-white wove paper

Purple chalk on cream modern laid paper; verso: black chalk

Transparent and opaque watercolor, with scratchwork, on cream wove paper

Graphite and brown wash on cream paper

Brown ink and wash on antique laid paper mounted on grey card

Watercolor, black ink, and white gouache on cream wove paper

Watercolor on cream laid paper, two sheets joined

Watercolor on off-white wove paper

Graphite on cream wove paper

Brown ink and graphite

Watercolor and red ink over graphite and black chalk on cream antique laid paper