862 



DISEASES OF CATTLE. 



sils, tools, etc. Close the buildings effectually; to prevent the es- 

 cape of gas, and allow the process to go on for three or four hours. 

 It may then be cleared of gas by throwing open the windows and 

 doors before any one enters. 



Chlorine gas is sometimes used for fumigation. It may be gen- 

 erated in the following manner : Put a quantity of the black oxide 

 of manganese in an ordinary glass flask, and cover it with muriatic 

 acid. Fix the flask in a stand, and heat it by means of a spirit lamp. 

 A yellowish green gas, of* strong odor is rapidly generated. The 

 animals must be removed, and the building effectually closed before 

 lighting the lamp. Chlorine gas may be liberated in small quanti- 

 ties by mixing in a saucer one part of the black oxide of manganese, 

 one part of common salt, and two parts of strong oil of vitriol. No 

 heat is necessary, but the mixture should be agitated from time to 

 time. As the gas is heavier than air, the vessel cdntaining the mixt- 

 ure should be placed at a considerable hight above the. floor, to 

 secure thorough fumigation. The animals need not be removed 

 during this process. A solution of chlorine gas is sometimes used 

 for washing the walls and floors. It is prepared by conducting the 

 gas through water, as shown in Fig. 1149. 



Fig. 1149.— Apparatus for Preparing Chlorine Gas. 



