an English physician and writer on mental illness. Arnold published a two-volume work titled Observations on the Nature, Kinds, Causes and Prevention of Insanity, the first volume appearing in 1782 and the second in 1806. Volume one included chapters on whether insanity was more common in England than elsewhere, chapters on the definition and arrangement of insanity, and a chapter on the dissected brain. Volume two discussed the causes of insanity and its prevention. A third volume on treatment appeared in 1809.
