160 MASTITIS OF THE COW 



fistula. Between the abscesses the cut surface was yellow- 

 ish-gray and irregularly granular. The lobuli of this area 

 showed no milk points, but great numbers of small yellow 

 caseous points or caseous streaks instead. Caseous plugs 

 were expressed. Gray fibrin was observed in the milk- 

 ducts and cisterns. Otherwise the udder presented no 

 lesions. 



In the yellowish-green pus from the abscesses numerous 

 small, thin Gram positive bacilli were found (pyogenes 

 bacilli ) . 



In the yellow, cheesy areas thin acid-fast rods were 

 observed (tubercle bacilli). 



