158 MASTITIS OF THE COW 



The entire cut surface of the udder presented a stinking 

 odor. The milk-ducts and cisterns contained a thin fluid 

 and their mucous membranes were red-stained. 



The lower portion of the cut surface of the left anterior 

 quarter was reddish-yellow and firm, and the structure dis- 

 tinct. The lobuli showed no milk points, but small yellow 

 pus points were frequent. Cylinders of pus were expressed. 

 Here and there yellowish-green caseous pus foci the size of 

 a pea and surrounded by a connective-tissue capsule were 

 observed. The cut surface presented no odor. The mucous 

 membranes of the milk-ducts were covered by loose, grayish- 

 yellow croupous membranes. Other parts of the udder 

 showed no lesions. 



The liquid from the incision in the posterior quarter 

 presented a great number of small thin Gram positive 

 bacilli (pyogenes bacilli) , together with a moderate number 

 of Gram positive round cocci arranged singly or in bunches 

 (staphylococci), besides other bacteria (putrefactive bac- 

 teria). The diagnosis of the staphylococci was corrobo- 

 rated by cultures. 



In the caseous pus of the anterior quarter only small 

 thin Gram positive pyogenes bacilli were found. 



B. TWO CHRONIC INFECTIONS 



1. Typical chronic streptomycosis in all four quarters, 

 complicated with tuberculosis in the right posterior quarter. 



The right posterior quarter of the udder was moderately 

 swollen and hard. The other quarters were decreased in 

 size, yet still thick and firm. 



The right lymph-gland was enlarged. The incision was 

 succulent with Ijnriph. On cut section the cortex presented 

 small yellow caseous points. The consistency was friable. 

 Incision in the right posterior quarter presented a small 

 quantity of yellow cream-like pus. The cut surface was 



