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Carburetted Hydrogen

There are two leading gaseous compounds of carbon and hydrogen, known as carburetted hydrogen, and distinguished as light and heavy. The light carburetted hydrogen is often abundantly disengaged in coal mines, and called methane, and fire damp. It consists of 2 equivalents of hydrogen and 1 of carbon, and If zinc be not at hand, fine iron wire, or the burns with a yellowish flame. This gas also turnings or filings of iron, may be substituted escapes in bubbles from the mud on the botfor it. To procure gas of great purity, dis-tom of stagnant pools, combined with cartilled zinc must be used, and it is advisable to bonic acid, from which it may be freed by GAS. passing through milk of lime, or a solution strong muriatic acid, in a small glass retort or of caustic potassa. (Cooley.) It has a specific gravity of about.559. (Fownes.) flask: apply the heat of a sprit lamp, and collect the gas over mercury. (See No. 4031.) 4054. Tests for Sulphuretted Hy- Heavy carburetted hydrogen is a combination of 2 equivalents of carbon and 2 of hydro- drogen. Sulphuretted hydrogen may be regen (4 carbon and 4 hydrogen-Booth), and cognized by the odor, and by its blackening burns with a white luminous flame; it is a moist carbonate of lead, and tarnishing sillittle lighter than air, having a specific gravity ver, and also by its precipitating arsenious of.931. It is also called Ethine. salts of lead black. acid yellow, tartar emetic orange, and the

4049. To Obtain Light Carburetted Hydrogen. When 2 parts crystallized ace- 4055. Phosphuretted Hydrogen. This tate of soda, 2 parts dry hydrate of potassa, is a gaseous combination of phosphorus and and 3 parts powdered quicklime, are strongly hydrogen; colorless, very fetid, slightly soluheated in a flask or retort, this gas is abund- ble in water, and burns with a white flame. antly evolved, and may be collected over It has a specific gravity of 1.24. water. (Sce No. 4031.) 4056. To Obtain Phosphuretted Hy-