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*44 Muriatic Genus* I S E C T I O N VIII. Muriatic Genus. Under this bead I include not only thofe earths and flones in which magnefia predominates, but alfo thofe in which the fiiiceous earth predo- minates, if magnefia be, next after this, themofl copious ingredient, and the compound pofiefles the charaäers of the muriatic arid not thofe of the fiiiceous genus. ift Species. Magnefia mixed with Silex. Silicimurite» ift Family. Keffekill. Myrfen. Meerfchaum of Werner. Neither pure nor aerated magnefia unmixed with any other fubftance have as yet been found. Of the magnefia, ieparated by art from other com- binations, 100 parts contain about 55 of mere earth, 30 ofaerial acid, and 150! water, when of the drynefs pofiefled by that ulually found in the ihops. Keffekill