I] 



they do not touch the person, dress, or surrounding objects. A 

 drop of Bromine, for example, accidentally thrown into the eye 

 might easily destroy the sight. 



CHLORIDE OF IODINE. 



The Chlorine is procured by putting pure oxide of manganese, 

 broken into small pieces in a glass retort, and pouring upon it 

 some hydro-chloric (muriatic) acid. The retort communicates 

 by a bent tube with a small bottle containing iodine, which it 

 promptly liquefies. When the resulting liquid becomes a bright 

 red, the operation is complete. The Chloride of Iodine should be 

 preserved in a bottle well stopped, a little white wax round the 

 stopper will prevent its adhering^ to the neck of the bottle. In 

 conducting this operation, precaution must be taken that the 

 Chlorine does not escape ; this gas being highly deleterious. 



EAU BROMEE. 



Add an excess of Bromine to pure water* in a bottle, shaking it 

 well for some minutes. To one part of this solution, add forty parts 

 water, and the mixture, of a bright yellow, is ready for use. 



BROMIDE OF IODINE. 



In a bottle which holds about three ounces, put 30 to 40 drops 

 of Bromine, the quantity is not very important. Add Iodine, 

 grain by grain, till the Bromine is saturated. The Iodine which 

 does not dissolve, may remain in the bottle. To one part of Bro- 

 mide of Iodine, add 200 parts water, and it is ready for use. 



GILDING SOLUTION. 



% 



The receipt for this solution, as given by M. Fizeau, the inventor 

 of this method of fixing, is as follows : 



Dissolve one part of Chloride Gold in 800 parts of water, and 

 four parts hyposulphite soda in 200 parts water, pour the solution 

 of gold into that of soda, by little and little, shaking it all the 

 while, the mixture at first slightly yellow, soon becomes perfectly 

 limpid. This mixture may be bought ready prepared of the 

 Opticians. 



* If you are nof sore of the purity of the water, add a few drops of nitric acid. 



