Copperas
sulphate of iron or green vitriol (FeSO4.7H2O), a salt of a pecucolor. When exposed to the air it asliar astringent taste and of a fine green sumes a brownish hue. It is much used copperas of in medicine as a tonic. cop in dyeing black and in making ink, and commerce is usually made by the decomposition of iron pyrites. commerce is usually made by the decom- position of iron pyrites. closely allied to the rattlesnake, found in the United States from New England to Florida. It has a thick body from 2 to 3 feet long. Lurking in dark and moist places, and giving no warning, it is more dreaded than the rattlesnake.
COPPERMINE RIVER