Cyanosis

[Gr. kyanosis.] ( Med.) A diseased con dition of the system, arising from a malformation of the heart, allowing the intermixing of the venous with the arterial blood, in consequence of which the former is not properly oxygenized, and a bluene is imparted to the skin; whence the disease takes its name. Little can be done towards effecting a cure of this disease; and though it interferes with the functions of the body and produces general weakne , it does not nece arily destroy life. It is commonly called the Blue Disease . le gas, with a peculiar penetrating odor. It is poison- Cyan'osite, CHALCANTHITE, n. ( Min. ) Native sulphate ous in its effects if breathed, and it burns with a beautiful purple flame. It di olves in one-fourth of its bulk of water, in one-twenty-fifth of alcohol, and may be submitted to a high temperature without decomposition. It is easily liquefied by a pre ure of 4 atmospheres. In the liquid state it is colorle , limpid, and lighter than water. At-3o Fabr. it freezes, forming a transparent crystalline solid. C., which is in itself a compound radical, has the property of uniting with various elements to form still more complicated radicals. Thus, with iron it forms 2 compounds, - ferrocyanogen, FeCys, or FCy, and fer rid cyanogen, F2Cy6, or FdCy; with cobalt, cobalt i of copper. This is rarely found in distinct crystals, but generally in stalactitic and other forms in the fi ures and hollows of old mines, or di olved in the waters. which i ue from them. Comp . Sulphuric acid, 321; oxide of copper, 31.8; water, 36-1.