166 THE PRACTICE OF VETERINARY MEDICINE. 



suppuration is in the form of an abscess. * Diffused ' suppura- 

 tion is where suppuration takes place over an extensive 

 surface, as in injuries of the groin, etc. In circumscribed 

 suppuration an enlargement makes its appearance, which on 

 palpation is found to be hot, hard, and painful. It goes on 

 gradually increasing until a full state of development is 

 reached ; it comes to a point and finally bursts. The exudate 

 surrounding it is gradually formed into pus, as in glanders, 

 strangles, etc. As a rule we apply heat to the part to 

 favour the development of pus, and hasten suppuration, 

 hence stimulating applications, as liniments, vesicants, etc., are 

 applied. Suppuration is also seen in wounds of any size which 

 heal by granulation, formation of pus, etc.,wdien properly 

 treated. 'Ulceration' also occurs as a result of inflammation : 

 the tissues degenerate, and are thrown off in exudation. It 

 occurs usually in cases where the inflammation has been 

 long continued, and the circulation of blood in the parts 

 obstructed, and molecular death of the part occurs. 

 * Gangrene' occurs as a result of inflammation, and is death 

 of the tissues either of a portion or whole of an organ. 

 Gangrene may take place without inflammation having 

 occurred, as it may be the result of an operation, or of any- 

 thing interfering with the circulation of the blood. Gangrene 

 affects the whole system, and sets up such a constitutional 

 disturbance that death often follows as a result. In cases 

 where recovery takes place, the. gangrenous portions are 

 removed by sloughing. In gangrene of the bowels death 

 invariably results. It is wonderful how the lungs will recover 

 when a part of them have been gangrenous, in which case 

 the gangrenous portions are expelled in the same manner as 

 any other foreign substance. Pus is a yellowish-white 

 substance, composed of pus corpuscles and liquor puris, the 

 latter being serum changed in condition. ' Laudable ' or 

 healthy pus has a creamy white colour, and is devoid of 



