The mineral medicines in use in his time are also included in the treatise of Dioscorides. He mentions argentum vivum, cinnabar, verdigris, the calces of lead and antimony, flowers of brass, rust of iron, litharge, pompholix, several earths, sal ammoniac, nitre, and other substances.
Other treatises, one on poisons and the bites of venomous animals, and another on medicines easy to prepare, have been attributed to Dioscorides, but it is not generally accepted that he was the author. The best known translation of Dioscorides into Latin was made by Matthiolus of Sienna in the sixteenth century. The MS. from which Matthiolus worked is still preserved at Vienna and is believed to have been written in the sixth century.
The very competent authority Kurt Sprengel, while recognising the defects in the Materia Medica of Dioscorides, credits him with the record of many valuable observations. His descriptions of myrrh, bdellium, laudanum, asafoetida, gum ammoniacum, opium, and squill are selected as particularly useful; the accounts he gives of treatments since abandoned (some of which are mentioned above, but to these Sprengel adds the application of wool fat to wounds which has been revived since he wrote), are of special interest; and the German historian further justly points out that many remedies re-discovered in modern times were referred to by Dioscorides. Among these are castor oil, though Dioscorides only alludes to the external application of this substance; male fern against tape worms; elm bark for eruptions; horehound in phthisis; and aloes for ulcers. He describes many chemical processes very intelligently, and was the first to indicate means of discovering the adulterations of drugs.
No writer of either ancient or modern times can compare with Claudius Galenus probably in the abundance of his output, but certainly in the influence he exercised over the generations that followed him. For fifteen hundred years the doctrines he formulated, the compound medicines he either introduced or endorsed, and the treatments he recommended commanded almost universal submission among medical practitioners. In Dr. Monk’s Roll of the College of Physicians, mention is made of a Dr. Geynes who was admitted to the Fellowship of the College in 1560, “but not until he had signed a recantation of his error in having impugned the infallibility of Galen.”[2] This was at the time when to deny Galen meant to follow Paracelsus, and the contest was fiercer just then than at any time before or since.