The evolution of the Doctrine of Signatures is presented, with reference to a physical as well as mental/spiritual mode of relating nature's medicinal substances to the human symptoms. Symbolism, intuition, biological observation, and the study of the medicinal properties serve as guides in the Doctrine of Signatures; modern science offers additional dimensions by relating physiological processes to physiology of disease.
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C Richardson-Boedler (1999) studied this question.
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