LabarraqueV Disinfecting Soda Liquid, 85 



yellow colour was obtained, being the same as M. Labarraque's 

 soda liquor, and with which the investigations were made that 

 will hereafter be described. 



3. An experiment was then instituted, in which the effect of 

 excess of chlorine,, upon a solution of carbonate of soda of the 

 same strength as the former, was rendered evident. The solu- 

 tion was put into two Woulfe's bottles, the chlorine well washed 

 and passed through, until ultimately it bubbled through both 

 portions without absorption of any appreciable quantity. As 

 soon as the common air was expelled, the absorption of the 

 chlorine was so complete in the first bottle, that no air or gas 

 of any kind passed into the second, a proof that carbonic acid 

 was not liberated in that stage of the experiment. Continuing 

 the introduction of the chlorine, the solution in the first bottle 

 gradually became yellow, the gas not being yet visible by its 

 colour in the atmosphere above the solution, although chlorine 

 could be detected there by litmus paper. Up to this time no car- 

 bonic acid gas had been evolved ; but the first alkaline solution 

 soon acquired a brighter colour, and now carbonic acid gas 

 began to separate from all parts of it, and passing over into the 

 second bottle, carried a little chlorine with it. The soda solu- 

 tion in the first bottle still continued to absorb chlorine, whilst 

 the evolution of carbonic acid increased, and the colour became 

 heightened. After some time the evolution of carbonic acid 

 diminished, smaller quantities of the chlorine were absorbed 

 by the solution, and the rest passing into the atmosphere in the 

 bottle, went from thence into the second vessel, and there 

 caused the same series of changes and actions that had occurred 

 in the first. The solution in the first bottle was now of a 

 bright chlorine yellow colour, and the gas bubbled up through 

 it as it would through saturated water. 



4. When the chlorine had saturated the soda solution in the 

 second bottle, and an excess of gas sufficient to fill several large 

 jars had been passed through the whole apparatus, the latter 

 was dismounted, the solutions put into bottles and distinguished 

 as the saturated solutions of carbonated soda ; they were of a 

 bright greenish-yellow colour, and had an insupportable odour 

 of chlorine. 



5. The saturated solution (4) was then examined as to the 



