Justus Friedrich Karl Hecker was one of three generations of distinguished professors of medicine. His father, August Friedrich Hecker, a most industrious writer, first practised as a physician in Frankenhausen, and in 1790 was appointed Professor of Medicine at the University of Erfurt. In 1805 he was called to the like professorship at the University of Berlin. He died at Berlin in 1811.
The Black Death, or the Black Plague, was one of the most deadly pandemics in human history, widely thought to have been caused by a bacterium named Yersinia pestis. It probably began in Central Asia and spread to Europe by the late 1340s. The total number of deaths worldwide from the pandemic is estimated at 75 million people. Dancing mania was a phenomenon that occurred primarily in mainland Europe from the 14th century through to the 17th century, in which groups of people would dance through the streets of towns or cities, sometimes foaming at the mouth or speaking in tongues, until they collapsed from exhaustion.
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