Paracelsus at Basel (1527): A Revolt Against Galenic Medicine

Paracelsus, the Swiss-born physician Theophrastus von Hohenheim, spent a stormy year as town physician of Basel from 1527 to early 1528. There he lectured in German instead of Latin, publicly rejected the ancient authorities Galen and Avicenna, and promoted medicines made from minerals and chemicals. His Basel episode ended in scandal, but it made him the symbol of a revolt against traditional medicine that echoed for two centuries.

Background: medicine before Paracelsus

University medicine in the early sixteenth century was built on ancient and medieval texts, above all the works of Galen, the Greek physician of the second century AD, and the Canon of Medicine of the Persian scholar Avicenna. Disease was explained as an imbalance of four humours: blood, phlegm, yellow bile and black bile. Treatment aimed to restore balance through diet, bleeding, purging and mainly plant-based remedies.

Theophrastus von Hohenheim was born around 1493–1494 near Einsiedeln in Switzerland, the son of a physician. He studied in Italy, probably at Ferrara, and then travelled widely as an army surgeon and wandering doctor. From miners, alchemists and folk healers he learned practical knowledge that university physicians ignored.

What happened in Basel

In late 1526 or early 1527 Paracelsus treated the famous Basel printer Johann Froben for a painful leg, reportedly avoiding the amputation other doctors had recommended. He also met Froben’s author and guest Erasmus of Rotterdam, who consulted him by letter. With support from Froben and the Protestant reformer Johannes Oecolampadius, the city council appointed him town physician, a post that carried the right to teach at the university.

His teaching programme, posted in June 1527, promised lectures based on his own experience rather than on ancient books. Unusually, he lectured partly in German, so that barber-surgeons and apothecaries as well as Latin-educated students could follow. On St John’s Eve, 24 June 1527, he is said to have thrown a standard medical textbook, traditionally identified as Avicenna’s Canon, into the students’ bonfire as a gesture against blind obedience to authority.

The faculty refused to recognise him, questioned his doctorate and resented his abrasive style. A satirical poem mocking him in the voice of Galen’s ghost was posted by students. Froben’s death in October 1527 removed his main protector. In early 1528 a dispute over a fee with a wealthy canon went to court; when Paracelsus attacked the magistrates in print, he faced arrest and fled Basel in February 1528.

Ideas and methods

Paracelsus argued that diseases were specific entities with external causes, not only imbalances of humours, and that each needed a specific remedy. He extended alchemy from the search for gold to the preparation of medicines, using substances such as mercury, antimony and sulphur compounds, carefully processed. He added a theory of three principles, salt, sulphur and mercury, to the four classical elements.

His best-known principle appears in his Seven Defences of 1538, where he argued that all things are poisons and only the dose makes a thing not a poison. He also wrote one of the first books on the occupational diseases of miners, and his Great Surgery Book (1536) was a commercial success. Much of his work, however, mixed observation with astrology, magic and religious speculation, which modern readers should not overlook.

Key people

• Paracelsus (c. 1493–1541): physician, surgeon and alchemist; adopted the name Paracelsus around 1529.
• Johann Froben (c. 1460–1527): Basel printer and patient, whose support helped bring Paracelsus to the city.
• Erasmus of Rotterdam: humanist who consulted Paracelsus during his time in Basel.
• Johannes Oporinus: Paracelsus’s assistant in Basel, later the printer of Vesalius’s Fabrica.

Consequences and legacy

After Basel, Paracelsus wandered through Alsace, southern Germany, Switzerland and Austria, writing prolifically but publishing little. He died in Salzburg on 24 September 1541. From the 1560s his followers printed his manuscripts, and “Paracelsians” became an influential movement, especially in Germany, France and England. Their chemical remedies gradually entered official pharmacopoeias, and iatrochemistry, the explanation of bodily processes through chemistry, became an important school in the seventeenth century.

Historians today see Paracelsus as a transitional figure: a critic of authority and a champion of experience, yet also deeply rooted in Renaissance magic and religion. His contemporary Ambroise Paré shared his trust in practical experience, though in a far less combative style.

Myths and facts

• Myth: “bombastic” comes from his name Bombastus. Fact: the English word derives from cotton padding and is unrelated.
• Myth: he was the first to use chemicals in medicine. Fact: medieval and Islamic physicians used mineral remedies; Paracelsus made them central to a new theory.

Timeline

• c. 1493–1494: Theophrastus von Hohenheim born near Einsiedeln.
• 1526–1527, winter: he treats the printer Johann Froben in Basel.
• 1527, spring: appointed Basel town physician and university lecturer.
• 1527, 24 June: a medical textbook is thrown into the St John’s Eve bonfire.
• 1527, October: Froben dies.
• 1528, February: Paracelsus flees Basel.
• 1538: writes the Seven Defences, including “the dose makes the poison”.
• 1541, 24 September: dies in Salzburg.

Why it matters

The Basel year of 1527 dramatised a turning point: the idea that medicine should rest on observation and experiment rather than reverence for ancient texts. Paracelsus’s chemical remedies and his principle of dose remain part of pharmacology and toxicology today.