336 BUILDINGS, SANITATION, AND DISEASES 
striking contrast arc the liogs slaughtered at three citics in one 
of the leading dairy states, where there is a large number of 
co-operative ereamerics and the raw skimanilk is fed.” 
* Buyers for packing-houses are learning from bitter ex- 
perience to avoid sections of certain states, and two firms will 
not buy hogs from one state known to be badly infected. In 
fact, many of the smaller packers in the (‘entral West buy 
subject to post-mortem inspection, as a measure of self-pro- 
tection.” 
“Tt is known beyond all doubt that the majority of tnber- 
culous hogs are produced hv the following causes: 
“1. Feeding raw milk and slime from creameries. 
“2, Feeding hand-separated milk from tuberculous cows. 
“3, Feeding behind tuberculons cattle. 
“4, Feeding tuberculous carcasses. 
“5, Feeding slaughter-house offal. 
“The danger of feeding hogs behind tuberculous cattle lies 
in the fact. that such cattle discharge enormous numbers of 
tuberculosis germs in their faces.” 
Symptoms Obscure.—The quotations given show the im- 
portance of this disease, and the need for the farmer to be on 
his guard. It is a contagions disease and must be treated as 
such. The symptoms are not well marked, and a hog may be 
badly diseased and show practically no clinical symptoms. If 
the lungs are affected, the hog usually has a cough, and, if the 
digestive organs are badly affected, there is generally indiges- 
tion, and general lack of thrift; but similar symptoms may 
show themselves with other diseases, and it requires a great 
deal of experience to diagnose the disease with certainty. 
Treatment is entirely preventive, Since the disease is 
usually communicated to hogs through their feed, it is neces 
