PHARMACEUTICAL NOTICES. 
183 
There should be two lateral tubulures, one placed immediate- 
ly below the diaphragm, and the other very near the bottom.* 
The interior of this vessel should be covered with lead. Place 
upon the diaphragm, in a very compact manner, the crystal- 
lized carbonate of soda broken into fragments of the size of an 
inch, so as to almost wholly fill the vessel. Adapt to it a lid 
fitting accurately, and furnished with an opening through 
which a communication by means of a tube may be made be- 
tween this and a similar vessel containing also crystallized 
carbonate of soda: fasten the lid with strong luting. Adapt 
to the inferior tubulure, a glass tube, bent at right angles, 
which will present the means of drawing off the liquid which 
accumulates during the operation, without the trouble of dis- 
mounting the apparatus ; for this purpose all that is necessary 
is to place the free branch vertically, and direct the opening 
downwards. If, on the contrary, the opening is directed up- 
wards, the liquid ceases to flow, and the interior of the appara- 
tus is no longer in communication with the air. The tubulure 
placed immediately under the diaphragm, is likewise provid- 
ed with a tube intended to connect this first vessel with the 
apparatus for generating the carbonic acid gas. 
This last apparatus consists of two vessels of glass or stone 
ware, of about equal capacity, together with a bottle for wash- 
ing the gas. Fill one of these vessels with hydrochloric 
acid, diluted with two or three parts of water, and the other 
with marble, broken in pieces. This second vessel should be 
furnished at its inferior part with a tubulure, to which may be 
adapted, by means of a good cork, a tube bent at right angles, 
so as to be able at will to remove the solution of chloride of 
calcium produced during the operation, without disturbing 
the apparatus. The acid bottle should be placed upon an ele- 
vated support, so that its inferior part should be upon a level 
with the superior part of the other vessel. From this last there 
sett off two tubes, the first to convey the carbonic acid gas 
into the wash-bottle containing water, from whence it is 
*In France they employ vessels of stone ware, which are made ex- 
pressly for this use. 
