CHAPTER XX, 



LUMPY JAW. 



This condition is also known as wooden tongue 

 from the fact that when it affects the tongue of 

 cows, their tongues become very stiff. 



This condition is usually noticed only when it 

 produces a swelling externally and this is most 

 times on the angle of the jaw, but frequently it 

 affects the muscular tissues lying between the 

 jawbones. It frequently occurs internally, but 

 it is doubtful if it can be diagnosed in the living 

 animals ; it is no doubt many times diagnosed as 

 tuberculosis. 



This is a disease of young or middle aged 

 cows and rarely attacks older ones. This growth 

 that is noticed is smooth, firm and very slowly 

 increases in size, until finally it seems to attach 

 itself to the bone. Many of these growths after 

 a time get soft and break open, discharging a 

 peculiar pus, very much resembling the mar- 

 row of the bones. Occasionally there will be 

 as many as four or five of these openings. 



This is considered as an infectious disease, but 

 it is not often that we find more than a single 

 13.3 



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