Cyanuric Acid

( Chem.) This acid is obtained in a variety of ways, which need not be described here. It is deposited from its aqueous solution in colorle rhombic prisms. It is sparingly soluble in cold water, more freely in boiling alcohol, and still more so in boiling water. It is polymeric with cyanic acid and several other products of cyanogen. Form ., C,H,OH cyanogen; with manganese, mangani-C.; with platinum, Cybele. ( Myth.) A name of the godde Rhea, the platino-C.; with palladium, palladio-C.; with iridium, iridio-C.; and with copper, cupro-C.; -which all behave as elements, uniting with the metals, and forming hydracids with hydrogen. The principal compound of C. is cyanic acid, composed of an equivalent of C., and an equivalent of oxygen, which has been described under the head of Cyanic Acid . It also forms five other compounds with oxygen, all of which po e precisely the same composition, but differ remarkably in their properties. They are cyanuric, cyanilic, fulminuric, fulminic acids, and a body called cyamelid. Descriptions of their properties will be found under their respective headings. With nitrogen, cyanogen forms cyanamide. C. forms with chlorine 3 compounds, which have all the same ultimate composition, but differ materially in their properties. One of them is gaseous, another liquid, and the third solid. With iodine and bromine it forms solid combinations; with sulphur it forms a compound radical, sulpho-cyanogen (SCy), which, with hydrogen, forms hydrosulphocyanic acid; with selenium a similar compound is formed. The cyanides of the alkalies and earths are soluble, those of the heavy metals mostly insoluble in water. The most important of these is the cyanide of pota ium , which is obtained by heating to redne in an iron crucible 8 parts of ferrocyanide of pota ium and 3 of carbonate of soda, until the mixture has ceased to be of a yellow color, and has given off the last bubble of gas. This salt is made in large quantities for the use of electrotypists and photographers. The former use it as a solvent for gold and silver in electro-plating; the latter to remove the unused iodide of silver from the collodion plate. C. is prone to form double salts with the metals. Cyanide of pota ium, when added to solutions of the heavy metals, throws down a precipitate, which is soluble in an exce of the precipitant, forming double cyanide of pota ium and the metal. These double cyanides are of two cla es, - those which form salts easily decomposed by hydrochloric acid, such as cyanide of pota ium and silver; and those which are not so easily decomposed, such as the cyanides of pota ium and iron, of pota ium and cobalt, and several others. The salts of the second cla are looked upon by chemists as containing the metal united with the cyanogen, forming an organic radical. This will, perhaps, be better understood by considering the following for mule: 1st cla . -Double cyanide of nickel and pota ium, NiCy, KCy. 2d cla . -Double cyanide of iron and pota ium, or ferrocyanide of pota ium. + 2 (KCy) FeCyK + FeCy3 daughter of and Terra, (Heaven Earth,) and sister and wife of Saturn. She is also called the mother of the gods, and is usually represented with a gravid uterus, and many breasts, as symbolical of the fecundity of the earth, and the prolific fountains of plenty it pro duces.