longed the purifying, and beyond it must be detached 

 from the sugar for which purpose the action of car- 

 bonic acid must be employed, which has a greater 

 affinity for lime than sugar. To effect this, a current 

 of carbonic acid is directed into the liquid mass which 

 takes up the lime and forms with it carbonate of 

 lime. This carbonate, when being precipitated to 

 the bottom of the vessel in which the operation is 

 carried on, draws with it all the impurities con- 

 tained in the juice and when settled, leaves the 

 latter colorless and limpid on the top of the muddy 

 deposit of carbonate of lime and decomposed matter. 

 This juice then only contains sugar and salts of 

 potash and soda, and a small portion of organic 

 matter which escaped the action of the lime. 



In establishing this new principle which serves as 

 a basis for the manufacture, I wished to avoid 

 entering into embarassing decails, when explaining 

 khe purifying process. To complete my explana- 

 tions I will show the manner in which carbonic 

 acid is manufactured. 



3. PRODUCTION OF CARBONIC ACID GAS. 



To prepare carbonic acid for manufacturing pur- 

 poses, lime stone or carbonate of lime which is com- 

 posed of 56 parts of lime and 44 of carbonic acid 

 is used. 



This preparation is made by decomposing lime 

 stone by heat. It is simply the preparation of lime, 

 with this difference, that the gas produced during 

 the operation i- collected. Thus at the same time, 



