A text-book on chemistry : for the use of schools and colleges . b is the flask containing alcohol and sulphuric acid, and aan interposed globe to receive the ether, oil of wine, andwater, which distill over. Olefiant gas is transparent and colorless ; burns with abeautiful flame (Fig. 252, page 245); forms an explosivemixture with oxygen, giving rise by its combustion to car- Of what does the explosive gas of coal mines consist ? How is olefiantgas prepared? What are the products of combustion of olefiant gas ? CYANOGEN. 245 bonic acid and water. If mixed withan equal volume of chlorine, the
A text-book on chemistry : for the use of schools and colleges . b is the flask containing alcohol and sulphuric acid, and aan interposed globe to receive the ether, oil of wine, andwater, which distill over. Olefiant gas is transparent and colorless ; burns with abeautiful flame (Fig. 252, page 245); forms an explosivemixture with oxygen, giving rise by its combustion to car- Of what does the explosive gas of coal mines consist ? How is olefiantgas prepared? What are the products of combustion of olefiant gas ? CYANOGEN. 245 bonic acid and water. If mixed withan equal volume of chlorine, the gasescondense into an oily liquid, from whicholefiant gas has received its name. Withtwice its volume of chlorine, if it be seton fire, hydrochloric acid is formed, andcarbon is deposited as a dense blacksmoke. Olefiant gas also exists as one of thechief ingredients in the gas employedfor illuminating LECTURE LV. Cyanogen.—Modes of Preparation.—Liquefaction.—AnElectro-negative Compound Radical. — Bisulphuret ofCarbon.—Boron.—Boracic Acid.— Terfluoride of Bo-ron.—Silicon.—Silicic Acid.—Fluoride of Silicon.—Compounds of Hydrogen and Nitrogen.—Amidogcn.—Ammonia.—Ammonium.— Theory of Berzelius. CYANOGEN, OR BICARB URET OF NITROGEN. C2iV=26-23. Carbon unites with nitrogen, forming a bicarburet,when these substances are in the nascent state and in pres-ence of a base. It may be obtained very easily by expo-sing the cyanide of mercury to heat, or by heating a mix-ture of six parts of ferrocyanide of potassium and nine ofcorrosive sublimate. It is a colorless gas, having a peculiar odor. It burnswith a beautiful purple flame, dissolves readily in water,and still more so in alcohol, condenses into a liquid by apressure of 3-6 atmospheres at 45° Fahrenheit, as maybe shown by heating with a lamp cyanide of mercury in abent tube, as seen in Fig. 253 ; the tu
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