PISINFECTION 521 
ous, but quite corrosive, and care should be taken to protect the eyes 
and hands from accidental splashing: 
Gallon 
Crude carbolicacid 2.0.0.0... 0.00000 ccc cece cece cee ne eeceeeceees % 
Crude sulphuric acid .......0..000 0000002 c cece cece ce eeeeeneeees 4 
These two substances should be mixed in tubs or glass vessels. 
The sulphuric acid is very slowly added to the carbolic acid. During 
the mixing a large amount of heat is developed. The disinfecting 
power of the mixture is heightened if the amount of heat is kept down 
by placing the tub or glass demijohn containing the carbolic acid in 
cold water while the sulphuric acid is being added. The resulting 
mixture is added to water in the ratio of 1 to 20. One gallon of mixed 
acids will thus furnish 20 gallons of a strong disinfecting solution, 
having a slightly milky appearance. 
Formalin. Formalin is being highly recommended as a disinfectant 
when used in a 5 per cent. solution. The floors and walls should be 
thoroughly wet with it. 
Ordinary slaked lime. Although it does not possess the disinfecting 
power of the substances given above, slaked lime is nevertheless very 
useful. It is well adapted for disinfecting the surface of yards and 
pens. Itis very good to apply to the ceilings and walls of stables. 
There are a number of other substances that may be used, such as a 
solution of blue vitriol or creolin. 
In disinfecting stables and pens all litter which has accumulated 
should be removed before applying the disinfectant. As the litter 
itself is infected it should be disinfected as well as the stable floor and 
walls. The most efficient method for disinfecting the litter is fire. 
‘The practice of washing the floors and ceiling with water before 
applying the disinfectant has in most instances the disadvantage that 
the water carries the microérganisms to be destroyed into cracks and 
possibly through the floor, where they will not be affected by the later 
application of the germicide. It is deemed safer to simply use dry 
cleaners, avoiding dust as much as possible, and to burn the sweepings 
or to thoroughly wet them with a strong disinfectant. The disinfect- 
ant is then applied in sufficient quantity to thoroughly saturate the 
surfaces, including the adhering particles of dirt. The solutions 
available for stable disinfection are cheap enough to admit of this pre- 
‘caution. 
In the application of disinfectants it is well to use a broom and 
“thoroughly scrub the floor and lower part of the walls. This is neces- 
