with Carbonic Atid Gas. 417 



gas. He fills common round bottles with water, inverts 

 them carefully under water in order to prevent any air from 

 entering, and charges them in the ufual method with car- 

 bonic acid gas. He then corks the bottles, thus filled, 

 under the water, with a ventilated ftopper, immerfes them 

 under water in a proper cylindrical, almoft tubular fhaped 

 vefiel, 2 feet high, and of a proportionate width to the dia- 

 meter of the bottle, in order to apply, by means of hydro- 

 ftatic laws, a great preflhre with a fmall quantity of water. 

 The bottles thus filled with the gas, and entirely immerfed, 

 imbibe water by means of the affinity the carbonic acid gas 

 has for it, in fuch a manner that they are nearly filled ; and 

 water is thereby obtained, impregnated with an equal volume 

 of gas, the water having lodged itfelf in the interftices of the 

 gas. It is pretty ftrong, and can be made ftill more fo. 

 This method has, befides its conveniency and chcapnefs, 

 ftill other advantages ; the degree of impregnation may be 

 regulated by the height of the column of water under which 

 the bottle is immerfed, and the water is prepared in thofe 

 vefTels out of which it is to be drank, and this prevents that 

 efcape of gas which always takes place when poured from 

 one veffel to another, efpccially if the water be ftrongly im- 

 pregnated. The above-mentioned ventilated ftoppers are 

 corks fitted exactly to the bottles, perforated length-ways, by 

 holes drilled through them, the uppermoft orifices of which 

 are covered with a fmall plate of pewter, fattened to the cork 

 by means of a firing palled through a hole in the centre, and 

 drawn through the cork. If this fmall plate be fumifhed 

 with a little cavity, in which iron filings are put, the water 

 becomes chalybeate. 



Vol. III. Ec XIV. lift* 



