Book IV covers medicine, including the four humours, diseases, remedies and medical instruments. He derives the word medicine from the Latin for "moderation" (), and "sciatica" () from the affected part of the body, the hip (Greek ).
book iv covers medicine including the four humours diseases remedies and medical instruments he derives the word medicine from the latin for "moderation" () and "sciatica" () from the affected part of the body the hip (greek )