NINTH ANNUAL YEAR BOOK— PART X 479 
have the affected animals slaughtered and the stables disinfected. A 
large proportion of the animals which are slightly affected yield car- 
casses which are perfectly wholesome and fit for human food, but in all 
such cases there should be an inspection by an expert at the time of 
slaughter to determine which carcasses may be used and which should be 
destroyed. 
The disinfection of stables may be accomplished by thoroughly cleaning 
them, scrubbing the floors with hot water brushing down all loose dust 
from the walls, and tearing off all woodwork which is partly decayed. 
Then the whole interior of the stable should be covered with a good coat 
of lime wash containing 1 part of formalin (which is a 40 per cent v.^atery 
solution of formaldehyde) to 30 parts of the lime wash, or 4 ounces of 
formalin to each gallon of lime wash. 
Similar precautions should be observed in removing the manure of the 
infected herd from the barnyard and other places accessible to cattle 
since it is known that tuberculous cattle frequently eliminate large num- 
bers of tubercle bacilli from their bodies through the feces. The ground 
under the manure pile could then be disinfected either by applying the 
above mentioned formalin solution or unslaked lime thickly sprinkled 
over the soil. 
If all the animals which react are destroyed and the stables disinfected 
in this manner, the herd should remain free from the disease unless other 
affected animals are added to it. The introduction of the disease in this 
manner may be avoided by requiring a tuberculin test of all new animals 
admitted on the premises. 
It is unfortunately a fact that animals v/ith tuberculosis Y.hich have 
been tested several times may become so accustomed to tuberculin that 
they will no longer react consequently it is always advisable to purchase 
cattle from some one who is known to be reliable, as otherwise tubercular 
animals may be treated with tuberculin for the purpose of hiding the 
disease. 
In the case of very valuable thoroughbred animals it may be more 
advantageous to retain the reacting animals which are in good condition, 
in order to breed from them and in that manner avoid the excessive loss 
which would follow from their immediate slaughter. This may be 
done safely if proper percautions are adopted. The healthy animals should 
be separated from the diseased ones, and the stable in which the dis- 
eased animals have been should be frequently disinfected. When calves 
are dropped by the tubercular cows they should be immediately removed, 
or at least not allowed to drink the mother's milk more than once or 
twice, and after that fed upon the milk of healthy cows. The milk from 
the animals which have reacted should not be used until after it has been 
boiled and the tubercle bacilli thus destroyed. The young animals which are 
raised from tubercular dams should be tested when they are about six 
months old, and all those which react should be immediately slaughtered. 
It has been found that by following the plan suggested above not more 
than 1 or 2 per cent of the calves will develop tuberculosis. It is, of 
course, some trouble to follow this method, but it enables the owner of a 
pure bred herd to retain the strains of blood which he has been breeding 
