The text claimed bloodletting is a good treatment for the plague and cured some cases. This is an example of an error that was corrected with new evidence.
Withholding blood from a patient in order to treat or prevent disease is known as bloodletting. Bloodletting, whether done by a doctor or a leech, was based on an antiquated medical philosophy that viewed blood and other physiological fluids as "humor" that needed to be kept in the right balance to sustain health. Over a period of more than 2,000 years, from antiquity to the late 19th century, it is said to have been the most popular surgical procedure. By the end of the 18th century, the practice was still very widespread in Europe. Except for a few very particular medical situations, modern medicine has now given up on the practice.
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