_Cooper, Sir Astley Paston:_ A celebrated English surgeon, who was born
at Brooke, in Norfolk county, England, August 23d, 1768, and commenced
the practice of surgery in London, in 1792. He was appointed surgeon to
King George IV. in 1827, was created a baronet in 1831, and died
February 12th, 1841. He was the author of many valuable works.
_Copal:_ A hard, shining, transparent resin, of a light citron color,
brought originally from Spanish-America, and now almost wholly from the
East-Indies. It is principally employed in the preparation of _copal
varnish._
_Copper, Sulphate of:_ See _Sulphate of copper.
_Copperas:_ (Sulphate of iron or green vitriol,) a bright green
mineral substance, formed by the decomposition of a peculiar ore of
iron called pyrites, which is a sulphuret of iron. It is first in the
form of a greenish-white powder or crust, which is dissolved in water,
and beautiful green crystals of copperas are obtained by evaporation.
It is principally used in dyeing and in making black ink. Its solution,
mixed with a decoction of oak bark, produces a black color.
_Coronary:_ Relating to a crown or garland.
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