418 PRINCIPLES OF VETERINARY SURGERY 



attention to what occurs around her. Rumination is sus- 

 pended and she will occasionally switch the tail and lightly 

 rest one posterior limb. The respirations are accelerated 

 and heart beats violent, the pulse fast, small and difficult 

 to perceive. The temperature is 40 degrees C. The hog 

 will hide away in the litter or ground and will not move 

 when presented with food. The skin is either discolored 

 or becomes red or purple. The disease may develop tardily 

 and may not kill the animals for several weeks after cas- 

 tration. 



PROGRESS. — The course of the disease, although ir- 

 regular, is generally slow, unless complicated with septi- 

 cjemia. Death occurs after eight days, twelve days or sev- 

 eral weeks. The rapidity of its evolution is subordinate to 

 the virulence of the micro-organisms, and the resistance 

 of the patient. 



PATHOLOGICAL ANATOMY.— Metastatic abscess is 

 the "signature" of pyaemia. It can be encountered in all the 

 organs, the lungs, kidneys, heart, liver, spleen, brain, mus- 

 cles or articulations. Often it exists only in one of them. 

 The lungs are seldom idemnified. They present changes 

 that vary with the. rapidity of the process from so-called 

 infarction to well developed pus collections. As the in- 

 farct results from vascular obstruction, its extent wall de- 

 pend upon the size of the obstructed vessels. It appears 

 macroscopically as a red and brown patch that breaks up 

 in cones in the pulmonary parenchyma. The infarcts are 

 fragments of the mortified and inoculated lung, and if the 

 animal lives they are transformed into abscesses, the volumes 

 of which are variable. They are found in all states of de- 

 velopment, the size of a millet seed, hazelnut, walnut or the 

 fist. They contain purulent products that are yellow and 

 quite liquid. Their internal faces are not different from 

 those of idiopathic abscesses. They usually occupy the 



