AUTOPSY 131 



friable. The color is grayish-red, due to infiltration with 

 blood. Here and there one may see circumscribed dark 

 red areas due to hemorrhage, or circumscribed yellow, firm 

 or pulpy areas of necrosis. The lesion is distinct and no 

 decomposition of the blood is present. The milk points are 

 absent. Yellow pus or yellow fibrin cylinders are ex- 

 pressed upon application of pressure to the lobuli. Yellow 

 pus or yellow firm masses of fibrin are found in the cisterns 

 and in the milk-ducts. 



Complication with gangrene is easily determined by the 

 odor. 



A macroscopic differential diagnosis of these conditions 

 is usually impossible, although firm, croupous membranes 

 point toward streptomycosis and a decided purulent soften- 

 ing of croupous membranes toward staphylomycosis. 



Staphylomycosis can be very severe and fatal, however, 

 in which case the udder shows diffuse necrosis ( severe pri- 

 mary lesion) without inflammation. This post-mortem 

 picture is different and very characteristic. 



The affected quarter is distinctly swollen and hard. The 

 incision is juicy and the cut surface presents a red serous 

 fluid. The cut surface is even and its consistency is firm 

 but friable. Here and there it shows black and red circum- 

 scribed areas due to blood infiltration and hemorrhage. The 

 cut surface is red and rich in blood for the most part. This 

 lesion is very distinct in consequence of a uniform distribu- 

 tion of the red coloring matter, which is not confined to the 

 injected blood-vessel or the areas infiltrated with blood, but 

 also uniformly stains the connective tissues, parenchyma, 

 mucous membranes and secretions. [Imbibition of liber- 

 ated hgemoglobin following decomposition of red blood 

 cells.] The milk points in the lobuli are entirely absent. 

 Pressure upon the lobuli causes a red fluid to be expressed. 

 Twig-like cylindrical red-stained masses of fibrin can be 



