JAROSITE  , a rare

mineral species consisting of hydrous potassium and aluminium sulphate, and belonging to the group of isomorphous rhombohedral minerals enumerated below: Alunite K2 [Al(OH)O6 (SO4)4 Jarosite K2 [Fe(OH)2]6 (SO4)4 Natrojarosite . . . . Nat [Fe(OH)216 (SO4)4 Plumbojarosite Pb [Fe(OH)218 (SO4)4 serious attention to the study of anatomy . He lived at first in Philadelphia, afterwards establishing himself in New York, where he enjoyed great popularity, though his conviviality and eccentric mode of life affected his work . He visited Baltimore, Charleston and New Orleans, entertaining much and painting portraits of prominent people, particularly in New Orleans, where General Andrew Jackson was one of his sitters . He had for assistants at different times both Sully and Inman . He affected singularity in dress and manners, and his mots were the talk of the day . But his work deteriorated, and he died in great poverty in New York City . Examples of his painting are in the collection of the New York Historical Society .