Tuberculosis 383 
When an animal that has had tubereulosis is ex- 
amined after death, the diseased tissue appears as lumps 
or nodules either in or on the organ attacked. If these 
rather hard lumps are eut open they will be found to 
contain a yellow, cheesy substance, which in many eases 
has turned to pus or matter, usually thick and yellow, 
with lumps of cheesy material in it. Sometimes the 
disease appears as a fibrous growth in reddish bunches 
on the outside of the organ, or part, such as the lungs, 
heart, liver, diaphragm, or “midriff,” or on the lining 
membrane of the chest or abdominal cavities. These 
lumps or tubereules vary in size from that of a pin- 
head to that of a marble, and may be so thick as com- 
pletely to cover the surface. Fig. 56. 
There is no treatment known that cures tuberculosis 
in cattle. However, there are preventive precautions. 
The best method of preventing the disease is to pre- 
vent healthy cattle from coming in contact with in- 
fected ones, or with infected stalls, food, feed-boxes, 
and drinking-places. If an animal has the disease, or 
is suspected, it should be isolated from others and the 
quarters thoroughly eleaned and disinfected by a 5 per 
cent solution of carbolie acid in water. Aside from pro- 
tecting cattle from the germs of the disease, the best 
method of preventing it is to keep the animals healthy 
and vigorous. Dark, damp, filthy and badly ventilated 
stables are hotbeds for the propagation of the dis- 
ease, once it is introduced. Sunlight is a great disinfec- 
tant. In fact, the germs are killed when exposed to 
direct sunlight for a few hours. Plenty of fresh air is 
also very important, preserving the animals’ health by 
