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Doctrine of signatures: (above) a plant with roots resembling the human hand, and (below) a hand. Coloured ink drawing, c. 1923, after G.B. Della Porta. | Wellcome Collection
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Doctrine of signatures: (above) a plant (acanthus) with seed-pods resembling a frog, and (below) the head of a frog. Coloured ink drawing, c. 1923, after G.B. Della Porta. | Wellcome Collection
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