SIENNA

consists of hydrated ferric oxide, manganese dioxide, and earthy matter. There are two varieties, ‘raw’, and ‘burnt,’ the former being dull brown in color, and the latter—formed, as its name implies, by heating the ‘raw’ S.—a bright red. Both varieties are used as pigments. town, Kalisz, Ru . Poland; agricultural machinery. Pop. 7,300.