152 TUBERCULOSIS 
breathjand cough, may be looked upon as strongly indicative of tuber- 
culosis with enlarged mediastinal lymphatic glands. Enlarged tuber- 
cular glands along the eosphagus may also press upon that organ 
causing obstruction and preventing the escape of gases from the 
stomach. 
Sometimes large tuberculous masses develop on the pleura. In 
such cases the principal symptom is a friction sound that is 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 interfered with. This gives 
rise to poor appetite, frequently to diarrhea and sometimes to alterna- 
tion of diarrhea and constipation. In tuberculosis of the peritoneum 
or of the lining of the abdominal cavity, the lymphatic glands of the 
E flank are often enlarged and 
hard. Sometimes this con- 
dition can be diagnosed posi- 
tively by a rectal examina- 
tion and the discovery of 
the hard, nodular masses. 
Tuberculosis of the liver 
does not give rise to symp- 
toms unless the disease is 
far advanced. 
In animals in which the 
post-pharyngeal lymphatic 
glands are enlarged, the 
breathing is harsh and noisy. 
In this condition there is 
sometimes difficulty in swal- 
lowing, and particles of 
chewed up food are occa- 
sionally expelled from the 
mouth, either voluntarily 
when it is found that they 
Fig. 27. Dorsau asPEcT OF BOVINE LUNGS. (a-a}) cannot be swallowed con- 
RIGHT AND LEFT CAUDAL LOBES, (b-b!) R. anp x. veniently, or by the cough- 
VENTRAL LOBES, (cc!) FIRST AND SECOND RIGHT ing they occasion upon 
CEPHALIC LOBES, (c?) LEFT CEPHALIC LOBE, (e) . 
TRACHEA, (X-X) REGION MOST FREQUENTLY In- Teaching the pharynx. 
VOLVED IN THE EARLIEST STAGES OF PULMONARY 
TUBERCULOSIS. THE LESIONS AT THIS STAGE ARE These enlarged glands ae 
USUALLY EMBEDDED IN THE LUNG TISSUE (Smith). sometimes be detected by 
