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 . carbonic acid gas. This methodhas been followed by Drs Babo and Freseniuswith the most satisfactory results, and is thusperformed:—{A) is a capacious flask for theevolution of carbonic acid, half filled withrather large pieces of solid limestone or mar-ble (not
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 . carbonic acid gas. This methodhas been followed by Drs Babo and Freseniuswith the most satisfactory results, and is thusperformed:—{A) is a capacious flask for theevolution of carbonic acid, half filled withrather large pieces of solid limestone or mar-ble (not chalk). To one aperture of the dou-bly perforated cork, a iunnel-tube (a) isadapted, which nearly reaches to the bottomof the vessel; to the other aperture a tube (b),by means of which the gas evolved is con-ducted into a flask of smaller size {B), inwhich it is washed and dried by concentratedsulphuric acid. The tube (c) conducts thecarbonic acid into the reduction-tube (C),which is shortened in the engr., and must bemade of difficultly fusible glass. When theapparatus is prepared, the sulphide of arsenicintended for reduction is rubbed in a smallbasin, previously heated in a water-bath, withabout twelve parts of a well-dried mixtureconsisting of 3 parts of dry carbonate of sodiumand 1 part of cyanide of potassium (prepared. by Liebigs method). The mixed powder isthen placed on a small strip of card-paper beatinto the shape of a gutter, which is next pushedinto the reduction-tube up to the point {f), and the tube is turned half round. In thismanner the mixture is deposited without soil-ing any other part of the tube; after whichthe strip of card-paper is cautiously withdrawn. 196 ARSENIOUS ANHYDRIDE The reduction-tube is then, by means of thecoi-k (e), fixed in its place ; a moderate streamof carbonic acid gas is evolved by pouringhydrochloric acid into the funnel-tube (a), andthe mixture carefully dried, by very mode-rately heating the tube along its whole length,by means
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