Links to useful resources:
General information on Circa instans:
http://blog.wellcomelibrary.org/2017/02/a-medieval-medical-bestseller-the-circa-instans/
Resources for science and medicine:
Apothecaries’ symbols in medical texts: https://textcreationpartnership.org/docs/dox/medical.html
Motherby, G. A new medical dictionary, or general repository of physic (1887). https://archive.org/details/b28406989