Doctrine of signatures: a plant with leaves resembling a bull's ear, above, and a bull's head, below. Coloured ink drawing, c. 1923, after a sixteenth-century woodcut illustration.
Wellcome Collection

Doctrine of signatures: a plant with leaves resembling a bull's ear, above, and a bull's head, below. Coloured ink drawing, c. 1923, after a sixteenth-century woodcut illustration.

1923

CC0 — Public Domain
Wellcome Collection
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