326 LABORATORY WORK. 



method of disinfection is as follows : Remove all dirt from all surfaces in 

 the stable. This must be done thoroughly or the disinfection will not be 

 complete. Water must be used freely to moisten up the dry filth that 

 has accumulated in various parts of the stable. The removal of the dirt 

 is thus facilitated, and the cleansing must be thorough. After such 

 cleaning, the whole stable should be washed with a solution of corrosive 

 'sublimate, above given (i-iooo). This may be done by simply washing 

 with a broom, or better, by spraying, provided a proper spraying apparatus 

 be at hand. It must be remembered, however, that corrosive sublimate 

 corrodes metals badly, and no metal spraying apparatus can be. used. 

 After the thorough wetting down of all surfaces of the stable by the disin- 

 fectant the stable must again be washed with water to remove the disin- 

 fectant. Instead of corrosive sublimate, a solution of chlorid of lime may 

 be used in the same way in washing the walls and floors. A disinfection 

 of a stable with formaldehyd or any other gaseous disinfectant is impos- 

 sible, since the stables are never tight enough to prevent the gas from escap- 

 ing rapidly. 



The Dairy. The disinfection of the dairy must follow along essentially 

 the same lines as the stable. Everything must first be cleaned as thoroughly 

 as possible, and then all woodwork may be washed with corrosive sub- 

 limate, or better, with a 3 to 5 per cent, solution of carbolic acid. 

 These solutions must not be used for washing the vessels which contain 

 milk. For cleaning these vessels nothing but boiling hot water and steam 

 are legitimate. After the disinfection of all parts, the whole must be 

 washed with water. 



Other localities inhabited by animals. To disinfect the barn-yard 

 in which cattle are allowed to roam is practically an impossibility, and the 

 same thing is true of the pig pen. The amount of moist material accumu- 

 lated in these localities is so great as to make disinfection impractical by 

 any means yet devised. We must make the same statement in regard to 

 pastures where infected cattle are allowed to roam. To disinfect a pas- 

 ture is an impossibility; it must be left to the action of sunlight and rains, 

 and these will, in the course of time, commonly produce the disinfection. 



