SYMPTOMS 135 



heard most distinctly during inspiration. If the masses are large 

 enough they give rise to a dull sound upon percussion. In 

 tuberculosis of the stomach and intestines, digestion is in- 

 terfered with. This gives rise to poor appetite, frequently 

 to diarrhoea and sometimes to alternation of diarrhoea and 

 constipation. In tuberculosis of the peritoneum or of the lining 

 of the abdominal cavity, the lymphatic glands of the flank are 

 often enlarged and hard. Sometimes this condition can be 

 diagnosed positiveh' by a rectal examination and the discovery 

 by this means of the hard, nodular masses. Tuberculosis of 

 the liver does not give rise to obvious symptoms unless the 

 disease is far advanced, in which case jaundice may be observed. 



In animals in which the post-pharyngeal lymphatic glands 

 are enlarged from tuberculosis, the breathing is harsh and 

 noisy. In this condition there is sometimes difficulty in swal- 

 lowing, and particles of chewed up food are occasionally expelled 

 from the mouth, either voluntarily, when it is found that they 

 cannot be swallowed conveniently, or by the coughing they 

 occasion upon reaching the pharynx. These enlarged glands 

 may sometimes be detected by palpation accomplished by plac- 

 ing one hand on each side of the throat above the larynx and 

 then pressing from opposite sides. 



Tuberculosis of the udder is detected by an enlargement 

 and hardening of the affected part, usually by the absence of 

 pain and the fact that the secretion is not altered until the part 

 has been diseased for some time. In advanced cases, instead 

 of milk, the udder secretes a yellowish, cloudy and sometimes 

 flocculent fluid. In acute, rapidly developing cases, there may 

 be pain and oedema of the skin. In nearly all cases of udder 

 tuberculosis the supra-mammary lymphatic glands, situated 

 above the udder in the middle of the escutcheon are enlarged 

 and hard. If there is doubt as to the character of the di.sease 

 of the udder, the milk, or possibly a piece of excised udder 

 tissue, may be examined bacteriologically. 



In tuberculosis of the brain, the animal is unsteady and 

 uncertain in its movements. It lies down much of the time, is 

 usually subject to occasional cramps and is apt to carry the 

 head in an unusual position. Such cases are inclined to in- 



