252 Dr. Beck on the Chlorides of Soda, Lime, fyc. 



and we shall hereafter see that other salts may also be em- 

 ployed for the same purpose. 



The substance which has received the name of Labarra- 

 que's disinfecting liquid, is prepared according to his own 

 formula, as follows : 2800 grains of crystalized carbonate of 

 soda are dissolved in 1.28 pints of water; being put into a 

 glass, two-thirds of the chlorine, evolved from a mixture of 

 967 grains of salt with 750 grains of oxide of manganese, 

 when acted upon by 967 grains of oil of vitriol, previously 

 diluted with 750 grains of water, are to be passed into it.* 



This liquid may also be obtained in the manner proposed 

 by M. Payen, which consists in the mutual decomposition of 

 chloride of lime and carbonate of soda. But this method 

 will seldom be employed, as all the valuable purposes of 

 the article can be attained by the use of the compound of 

 chlorine and lime alone. This is now so extensively employ- 

 in the process of bleaching that there is little difficulty in 

 obtaining it at any time. When it cannot be procured, 

 however, solutions of lime or soda may be easily charged 

 with chlorine gas, in the manner represented in the annex- 

 ed cut. 



^ 



Into the florence flask introduce manganese, common salt, 

 and dilute sulphuric acid, in the proportions above mention- 

 ed ; — taking «are that it is not more than a third filled. The 

 bottle may contain lime water, or solution of soda, or its 



* I quote from Faraday's paper on Labarraque's liquid, in Brande's Journal, 

 N. S. V. 2, p. 84 ; not having the original formula at hand. 



