Magical Metal

Yesterday mentioned the gold and silver cramp rings used in the Middle Ages in England to avoid cramps and epilepsy. (The sample here—alas!—is a later iron version.) Gold and silver were precious not only for their rarity and beauty; it was the reason for their beauty that made them magical.

Gold and silver do not oxidize like iron and copper. This "metallic immortality" surely helped to enhance the idea that they were special in a magical way. In fact, gold was considered medicine by many early authorities.

An 11th century lecturer at Salerno, Constantinus Africanus, claimed:

Gold is more temperate than the other metals. It has the property of relieving a defective stomach and comforts the fearful and those who suffer from a heart complaint. Galen confirms that it is effective against melancholy and baldness.

 Obviously gold needed to be ingested for it to work. To do so required very small pieces, and the Arab physician Abulcasis explained the method for preparing gold for consumption:

Take a piece of good and pure gold; and have a plate with pure sweet water in front of you; and have a rough clean cloth of flax, one end of which you keep in your hand. The other end should stay soaking in water on the bottom of the plate. Then rub gold with the cloth, always moistening the cloth with water, and fine filings descend to the bottom of the container. Do so as long as much of that gold as you want to have been shaved. Then leave for an hour; and mix water speedily and wash three times and dry up and preserve it.

Gold-based preparations were called aurum potabile ("drinkable gold"), written about by Michael Scot, Roger Bacon and others. Making it drinkable was no small trick, but it could be made into a liquid by combining hydrochloric acid and nitric acid. This mixture was one of the only ways to dissolve gold, and inspired alchemists to believe that an actual, pure aurum potabile was possible. Paracelsus (1493 - 1541), who was adamant that one could improve upon Nature, and his contemporary Johan Isaäc Hollandus were certain that pure liquid gold could be achieved and would have unbelievable curative properties.

The consumption of gold over time, however, far from enhancing health produced "auric fever": fever, profuse sweating, excess urination, gastrointestinal problems, and kidney damage. Evidence of death by gold has been found.

In 2013, The Geological Society published a collection of essays called A History of Geology and Medicine. One article, "Pharmaceutical use of gold from antiquity to the seventeenth century," points out that there is at least one modern medicine that includes gold: Myocrisin, an injectable used for rheumatoid arthritis.

Back to the subject of liquid gold: who figured out that hydrochloric and nitric could dissolve gold? That was a 9th century writer who produced the oldest known classification system of chemical substances. His name was Jabir ibn Hayyan, and you'll learn more about him next time.

Avicenna

In 1527, when the healer and alchemist Paracelsus wanted to display his contempt for tradition, he burned a book in the town square in Basle, where he had been appointed to the university by the town council. That book, allegedly, was The Canon of Medicine by Avicenna. Paracelsus had gone too far in rejecting what was still considered a fundamental work in western medicine. He was ejected from his post at the University, and from the town itself. Avicenna was too respected, even 500 years after he wrote his books.

Abū ʿAlī al-Ḥusayn ibn ʿAbd Allāh ibn Sīnā, called by the West Avicenna (c.980-1037), was mentioned here in the context of medicine. About 40 of the 240 surviving texts that he wrote (of a total of about 450!) deal with medicine. The encyclopedic Book of Healing and the Canon became standard textbooks for centuries.

The Canon assembled the best known medical knowledge to date, including Galen (129-c.200 CE) and Hippocrates (c.460-c.370 BCE) and adding a great deal of information that seems new to Avicenna. For instance:

The 'Qanun' is an immense encyclopedia of medicine. It contains some of the most illuminating thoughts pertaining to distinction of mediastinitis from pleurisy; contagious nature of phthisis*; distribution of diseases by water and soil; careful description of skin troubles; of sexual diseases and perversions; of nervous ailments. [George Sarton, Introduction to the History of Science]

Another reason why Paracelsus would want to burn Avicenna: Paracelsus was advertising his reputation as an alchemist, and believed that with salt, sulphur and mercury you should be able to produce anything. Avicenna, however, was completely opposed to the idea of alchemy, rejecting the notion that man could improve on Nature.

One could still work with Nature, however. Besides dealing with disease and injury (such as explaining how to judge how much healthy tissue could be removed during an amputation or the removal of cancerous tumors), Avicenna promoted restoring health, not just treating disease. He believed in the importance of physical exercise, of a good diet, and of a healthful environment.

Among other innovations, he lays the groundwork for modern ophthalmology, even suggesting that the optic nerves cross over each other. He laid out careful ground rules for the preparation, administration, and testing of drugs.

It has been called "one of the most significant intellectual phenomena of all times."** The Canon of Medicine is an essential part of any curriculum that studies the history of medicine.

*tuberculosis
**Swiss tuberculosis expert, Arnold Klebs