Before revision: Oils and the belief that they had healing properties, along with other beliefs of the time, are described by Dioscorides in his De Materia Medica, written in the 1st century .
After revision: A.DOils and the belief that they had healing properties, along with other beliefs of the time, are described by Dioscorides in his De Materia Medica, written in the 1st century .