Salts. 205 



with diftilled vinegar, which will then take 

 up only the manganefe. 



SPECIES XXIX. 



Marine Salt of Mercury. 

 See mercurial ores, Species III. 



SPECIES XXX. 

 Borax. 



In the ftate in which it is naturally found 

 requires about 18 times its weight of water 

 to diflblve it in the temperature of 60 ; its fpe- 

 cific gravity is about 1,74; it does not ef- 

 fervefce with the mineral acids, except they 

 be heated, and then but flightly ; when 

 heated, it fwells and lofes T 4 - of its weight, 

 and in a ftronger heat runs into a glafs,which 

 is rediflbluble in water. 



If to a faturate folution of borax, oil of 

 vitriol be added until it becomes fenfibly acid, 

 the fedative fait will feparate from the borax, 

 and fvvim on the furface in the form of white 

 fcales, the filtered liquor will on evaporation 

 yield Glauber s fait. 



100 parts of purified borax contain 34 of 

 real fedative acid, 1 7 of mineral alkali, and 47 



of 



