TUBERCULOSIS 165 
Fic. 37. A PHOTOGRAPH OF A CROSS SECTION THROUGH THE PORTAL GLAND OF A TUBER- 
CULOUS LIVER OF A COW. IT SHOWS SEVERAL TUBERCULOUS MASSES (a) WITHIN THE 
LIVER TISSUE. IN SOME OF THESE THE DEAD TISSUE IS BEGINNING TO CALCIFY. THE 
PORTAL GLAND (b) IS VERY MUCH ENLARGED AND TUBERCULOUS THROUGHOUT. 
(REDUCED IN SIZE). 
In case of poultry the bacteria are usually present in very large num- 
bers in the original lesions. 
