![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 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](https://iiif.wellcomecollection.org/image/V0025805/full/full/0/default.jpg)
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
![Doctrine of signatures: (above) a plant (antirrhinum)) with seed-pods resembling the head of a calf, and (below) the head of a calf. Coloured ink drawing, c. 1923, after G.B. Della Porta. Doctrine of signatures: (above) a plant (antirrhinum)) with seed-pods resembling the head of a calf, and (below) the head of a calf. Coloured ink drawing, c. 1923, after G.B. Della Porta.](https://iiif.wellcomecollection.org/image/V0025800/full/full/0/default.jpg)
Doctrine of signatures: (above) a plant (antirrhinum)) with seed-pods resembling the head of a calf, and (below) the head of a calf. Coloured ink drawing, c. 1923, after G.B. Della Porta.
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