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. 
