156 MASTITIS OF THE COW 



free, croupous membranes were found in the milk-ducts and 

 cisterns. No lesions were found in the other parts of the 

 udder. 



Fine acid-fast bacilli were found in the caseous foci 

 (tubercle bacilli). 



F. ACTINOMYCOSIS 



1. Actinomycosis of both posterior qitarters. 



Both posterior quarters of the udder were slightly- 

 swollen. The consistency was firm. 



The lymph-glands were not enlarged and on section 

 showed no lesions. 



Both posterior quarters showed the same lesions. The 

 incisions were somewhat dry. The lower part of the cut 

 surface was even, gray and irregular. It showed a number 

 of thickly placed yellowish-gray, soft, strongly convex foci 

 (actinomycomata) , which ranged in size from a hemp seed 

 to a pea and showed discrete yellowish-brown points. Other 

 parts of the udder manifested no lesion. 



Under the microscope brown bodies showed a radiating 

 structure and a distinct peripheral layer of club-shaped 

 structures (actinomyces fungi). 



2. Actinomycosis of the left anterior quarter. Ad- 

 vanced actinomycosis. 



The left anterior quarter of the udder was greatly 

 swollen and hard. The corresponding lymph-gland was 

 moderately swollen and the cut surface showed a number 

 of convex soft yellow points the size of a pea, showing small 

 discrete yellowish points. 



An incision in the diseased quarter was dry. The in- 

 ferior greater part of the cut surface was yellowish-gray, 

 somewhat even, and presented a number of round, soft, 

 convex relaxed foci the size of a walnut or larger, which 

 contained a number of small, discrete, yellowish-white 

 points. The milk-ducts and cisterns contained a yellow 

 flocculent fluid. Their mucous membranes presented 



