PRINCIPLES OF VETERINARY SURGERY 419 



periphery of the pulmonary lobes. Next to the lung the 

 liver is the organ most frequently afifected. It is found en- 

 larged and presenting abscesses in a circumscribed zone, 

 and with the biliary canals containing pus that is yellow and 

 clotted. The lesions of the kidneys are usually less devel- 

 oped. The affected kidney presents whitish, rounded spots 

 on its surface that penetrate into the parenchyma in the 

 form of white tracts as far as the vascular arch. They lose 

 these characteristics when the infarct has become- an ab- 

 scess. The brain, the spleen, the heart, the muscles, the 

 testicles, the bones, the articulations, and the walls of in- 

 testines and blood vessels, can become the seat of these pur- 

 ulent collections. The blood does not present any marked 

 changes, but is nevertheless tarry, sticky and changes rapidly. 

 The pus found in metastatic abscesses of the horse rarely 

 concretes because their development is usually rapid. M. 

 Laulane reported an interesting observation on this subject : 

 — pus of the abscesses of a horse affected with pyaemia of 

 slow progress became caseous. In the ox affected with 

 pyaemia Morot found abscess in the muscles of the croup, 

 pectoral region, cervical region, the longissimus dorsi, the 

 anteaspinatus, and in the extensors of the forearm. They 

 also exist in the kidneys, the heart and the spleen. In the 

 observations of Bournay, the spleen, the liver and the lungs 

 contained pus collections. In Mathis' report a pulmonary 

 abscess is described as having united the right pulmonary 

 veins together and partially obstructed them with a puru- 

 lent clot. The right femoro-tibial articulation contained 

 pus and there was a vast abscess in the posterior crural 

 muscles. Ellerman, who observed pyaemia in a cow follow- 

 ing a fracture of the sternum, found the following lesions: 

 sere-purulent accumulation at the seat of the fracture; de- 

 generation of the heart; congestion of the lungs and infil- 

 tration of the lymphatics ; diversfied lesions of the parenchy- 



