tomach, previously to its being converted into chyle.

_Cicuta_, the common American Hemlock, an annual plant of four or five
feet in height, and found commonly along walls and fences, and about old
ruins and buildings. It is a virulent poison, as well as one of the most
important and valuable medicinal vegetables. It is a very different
plant from the Hemlock tree, or _Pinus Canadensis_.

_Clarke_, (Sir Charles Mansfield,) _Dr._, a distinguished English
physician and surgeon, who was born in London, May 28, 1782. He was
appointed Physician to Queen Adelaide, wife of King William IV., in
1830, and in 1831, he was created a baronet. He is the author of several
valuable medical works.

_Cobalt_, a brittle metal, of a reddish-gray color and weak metallic
lustre, used in coloring glass. It is not easily melted nor oxidized in
the air.

_Cochineal_, a color procured from the cochineal insect, (or _Coccus
cacti_,) which feeds upon the leaves of several species of the plant
called cactus, and which is supposed to derive its coloring matter from
its food. Its natural color is crimson; but by the addition of a
preparation of potash, it yields a rich scarlet dye.

_Cologne water_, a fragrant perfume, which derives its name from having
been originally made in the city of Cologne, which is situated on the
River Rhine, in Germany. The best kind is still procured from that city.

_Comparative anatomy_, the science which has for its object a comparison
of the anatomy, structure, and functions, of the various organs of
animals, plants, &c., with those of the human body.

_Confection_, a sweetmeat; a preparation of fruit with sugar; also a
preparation of medicine with honey, sirup, or similar saccharine
substance, for the purpose of disguising the unpleasant taste of the
medicine.

_Cooper, Sir Astley Paston_, a celebrated English surgeon, who was born
at Brooke, in Norfolk county, England, August 23, 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 1821, and died
February 12, 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 gree