. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. l mattercontaining albumen, such as white-of-egg, aswell as from putrisable animal and vegetablesubstances, when in contact with a solublesulphate, and is always one of the gases pre-sent in the air of drains and sewers. Sul-phuretted hydrogen may be procured
. Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families. l mattercontaining albumen, such as white-of-egg, aswell as from putrisable animal and vegetablesubstances, when in contact with a solublesulphate, and is always one of the gases pre-sent in the air of drains and sewers. Sul-phuretted hydrogen may be procured by thedirect union of hydrogen and sulphur, as bypassing hydrogen into boiling sulphur. Butthis method of procuring it is rarely, ifever, adopted. The much readier process ofacting upon a metallic sulphide by an acidconstitutes the means by which the chemistalmost invariably obtains this gas. The details of the process are as follows: 1. About an ounce of ferrous sulphide, pre-viously reduced to small pieces, is placed in abottle, and then there is poured on to it a fluidounce of sulphuric acid diluted with 8 timesits bulk of water, when the following reactionensues :—FeS + H2S04 = RgS + FeS04. The gas which is immediately and copiouslygiven off may be collected in an apparatus, adrawing and description of which are The diluted acid, having become cool, ispoured through the bulb-shaped aperturedown the glass tube upon the ferrous sulphide,and the evolved gas passing through thesmall intermediate the bottleat the readers right hand, is absorbed by thewater therein contained, the operation beingcontinued until the water has become saturatedwith the gas. The glass tubes are connectedwith vulcanised India rubber, as shown in theabove plate. Diluted hydrochloric acid isfrequently substituted for sulphuric. 2. In the above process, the gas obtained,owing to the contamination of the iron sul-phide, is more or less impure. When sulphur-etted hydrogen is
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