POST-MORTEM REPORT 157 



rounded, soft, gray, relaxed, tumorlike growths from the 

 size of a pea to that of a hazelnut, which had grown in 

 through wounds in the mucous membranes. On section 

 these growths manifested small discrete yellowish-white 

 points. Otherwise the udder presented no lesions. 



Microscopic examination of scrapings from the soft foci 

 revealed actinomyces colonies showing rather indistinct 

 radiation. 



II. Mixed Infections 



A. CHRONIC INFECTIONS, COMPLICATED WITH ACUTE 

 INFECTIONS 



1. Pyobacillosis of the left half of the udder, complicated 

 with staphylomycosis in the posterior quarter. 



The cow had to be slaughtered. 



The left half of the udder was hard and swollen, the 

 posterior quarter greatly so, and the anterior quarter to a 

 moderate degree. 



The corresponding lymph-gland was not swollen and 

 it showed no lesions on section. 



The incision in the left posterior quarter was succulent 

 and the juice consisted of a red turbid fluid. The cut sur- 

 face was even and diffusely reddened. The consistency 

 was firm but friable, and the structure indistinct. The 

 lobuli presented no milk points, but here and there single 

 bright red colored points were seen (pus points). Red 

 fluid and dark gray cylinders of pus were expressed. In 

 other areas a number of round cavities ranging in size from 

 a pinhead to a bean were seen which contained reddish- 

 gray thin fluid or thicker caseous matter. The cavities were 

 surrounded by a thick, white, tough capsule of connective 

 tissue showing a smooth internal surface. A few sharply 

 circumscribed areas were dark red, due to blood infiltration. 

 A few veins were occluded by fu-m red-stained thrombi. 



