Cross-sections of seven different figures of the pregnant uterus. Engraving by A. Bell.

Doctrine of signatures: a plant with seed-pods resembling the horn of a unicorn, above, and a unicorn's head, below. Coloured ink drawing, c. 1923, after a sixteenth-century woodcut illustration.

Michael Faraday. Mezzotint by C. Turner, 1838, after himself.

The bones of the hand (fig.1: palmar; fig. 2: dorsal) and the wrist (fig. 3: detail of carpal bones). Engraving after G. de Lairesse, 1739.

Eight plants, including two orchids and two hawthorns: flowering stems. Coloured etching, c. 1837.