CLINICAL DIAGNOSIS OF MASTITIS 123 



tinct swelling of the udder are the typical stroma-inf ections : 

 Pyobacillosis, tuberculosis, and actinomycosis. 



The swelling of the udder is the first distinct symptom 

 of the disease. At first the milk is not changed, then it 

 becomes mixed with pus and finally, in about a month, 

 purulent. 



In order to observe the lesser changes in the milk, the 

 diseased quarter is well milked out and the milk poured 

 into a litre flask made of uncolored glass. The flask is 

 stoppered and then inverted for ten or fifteen minutes. At 

 the end of this time the sediment has collected in the neck 

 of the flask and on the stopper, so that one may readily 

 examine it for quantity, color and other qualities. 



Pyobacillosis usually aff*ects but one quarter, but may 

 spread to other quarters by infection. It produces a mod- 

 erate and finally large hard swelling of the udder. The 

 corresponding lymph-gland is not swollen. 



The milk frequently has a normal appearance, but 

 contains pus. It gradually becomes more intensely altered 

 and finally, after months, the milk becomes purulent, thick 

 and pulpy in consistency, due to the presence of thicker 

 pus. Gangrene is a common complication and imparts a 

 foul odor to the milk, which assumes a characteristic stink, 

 specific of decomposed cabbage. 



If the condition is an old one abscesses may form in the 

 udder which contain yellowish-green, thick, pulpy pus. 

 These may rupture upon the external surface and produce 

 fistulse. 



The condition is free from fever in the beginning, but 

 it occurs following the frequent complications with acute 

 secondary infections and gangrene. 



Tuberculosis attacks one or more quarters. The swell- 

 ing is very large and hard. The corresponding lymph- 

 gland is always enlarged and sometimes very greatly so. 



The size of the lymph-glands is different in the different 



