History of DOS

The doctrine of signatures may have grown out of a practical mnemonic aid.The concept was developed by Paracelsus (1491–1541) and published in his writings. During the first half of the 16th century, Paracelsus traveled throughout Europe and to the Levant and Egypt, treating people and experimenting with new plants in search of more treatments and solutions. As a professor of medicine at the University of Basel, he dramatically burned classical medical texts by Theophrastus, Galen, Dioscorides and Avicenna, but not Hippocrates.
The doctrine of signatures was further spread by the writings of Jakob Böhme (1575–1624), who suggested that God marked objects with a sign, or "signature", for their purpose. A plant bearing parts that resembled human body parts, animals, or other objects were thought to have useful relevance to those parts, animals or objects. The "signature" may also be identified in the environments or specific sites in which plants grew.
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