In Hawaii, the Mauna Loa volcano eruptions subside, having begun in 1843. During the 1887 eruption, about 2½ million tons (2.3 million metric tons) of lava per hour pours out, covering an area of 29 km2.
Franz König publishes "Über freie Körper in den Gelenken" in the journal Deutsche Zeitschrift für Chirurgie, first describing (and naming) the disease Osteochondritis dissecans.
Richard Hodgson and S. J. Davey, in the course of investigations into popular belief in parapsychology, publish one of the first descriptions of eyewitness unreliability.[10]
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