Geological Sketches, Bird's Skull

Black chalk on cream modern laid paper

Brown wash, graphite, opaque watercolor on off-white wove paper mounted overall to linen covered strainer

Brown ink over graphite on cream wove paper

Black ink and graphite on white wove paper

Graphite on white paper

Red chalk on cream antique laid paper

Black, blue, and red crayon, graphite, and white opaque watercolor on cream wove paper

Graphite, white gouache, and watercolor on cream wove paper, darkened to brown; verso: graphite

Black ink and graphite on white paper; verso: graphite and black ink

Black and red chalk on cream wove paper; verso: black and red chalk

Brown ink on blue antique laid paper

Watercolor, gouache, shell gold, and platinum paint on linen-covered panel prepared with zinc white ground