26 MANUAL OF EQUINE MEDICINE. 



tributed, and deprives the part of its function, for the time, 

 at any rate. 



When the embohis is small, the collateral circulation is 

 soon established, and the part may soon regain its normal 

 condition. In other cases collateral congestion occurs, and 

 a backward current takes place in the veins, leading to 

 hsemorrhage. 



The thrombosed tissue, infiltrated with extra vasated blood, 

 is called an hsemorrhagic infarct. 



If the infarct be infective, rapid softening and disintegra- 

 tion takes place and an embolic or metastatic abscess is 

 formed. 



If the infarct be non-infective and small, absorption or 

 organization takes place. If the infarct be non-infective 

 and large, it often softens and then becomes encapsuled, and 

 finally dries up, leaving a fibroid cicatrix. 



CAPILLARY EMBOLI— These consist of fat, masses of 

 organisms, white blood-cells in small masses, pigment- 

 granules, or air. 



In fractures, contusions of subcutaneous tissue, acute 

 osteo-myelitis, and other marked conditions in which fat- 

 cells are broken up and the fat set free, the particles are 

 absorbed and carried away by the lymphatics and veins. 



These emboli reach the right side of the heart, whence 

 they are carried to the pulmonary arterioles and capillaries. 

 These little plugs may be gradually swept on to the left 

 side of the heart, and are thence distributed by the cir- 

 culation to other organs, where they may collect in large 

 numbers. 



H/EMORRHAGE. 



Haemorrhage signifies an escape of blood from the general 

 current of the circulation. 



It may arise from rupture of vessels due to injury or to 



