mad hatter's disease symptoms
The phrase mad as a hatter was in use 30 years prior to the publication of Carroll's novel, and is associated with industrial felt hat workers in 19th-century England. Mercurial disease was common among hatters and included such symptoms as tremors, irritability, and mental instability. A document published in 1860 focuses on mercurial disease among hatters and the occupational hazards of mercury.1.