348 Veterinary Medicine. 



tions in cases of plugging and by a number of experiments on the 

 lower animals, not only that such clots may have their place of 

 nativity in some distant and diseased part of the body and pro- 

 ceed in the veins to the heart, and thence through the arteries to 

 other distant parts of the body where they plug the vessels and 

 induce a train of mobid changes ; but tha.t such embolism arteri- 

 tis and abscesses can be produced at will by the introduction into 

 the circulation of solid and insoluble (infecting) bodies. Frag- 

 ments of decaying and suppurating tissue and the elements of 

 tubercle and cancer may be thus equally carried onward in the 

 current of the circulation, and reproduce themselves at those 

 points where their course is arrested. This is a mode in which 

 secondary deposits of these morbid matters are determined. Em- 

 bolism and arteritis in the body and limbs oc:uring in this way 

 necessarily have their point of departure in pre-existing disease 

 of the lungs. The clots loosened from the capillaries or veins 

 of the lungs are carried through the left side of the heart into the 

 arteries of the body at large to be arrested in some of the smaller 

 vessels. I have seen plugging of the digital arteries of the hind 

 limbs, to occur in' this way in a horse that had been suffering 

 from inflamed lungs. 



Microbes and toxins may pass harmlessly through healthy 

 parts, including the pulmonic circulation, to establish colonies 

 and embolism beyond where the tissues have become debilitated. 

 Thus Gamgee records a case of embolism of the anterior mesen- 

 tric, right external iliac and right femoral arteries, supervening 

 on an attack of strangles. 



Symptoms of acute arteritis. These consist largely in impaired 

 muscular power in the part, indications of acute local suffering, 

 such as trembling and tenderness to the touch, if the obstructed 

 vessel lies within reach it can be felt as an exquisitely tender cord- 

 like mass, and the limb on the distal side of the embolism and 

 dependent on the diseased vessel for its blood supply is anaemic 

 and cold. In the distal portion of the embolic artery and its 

 branches pulsation ha's ceased. If the lesion is extensive there 

 may be more or less fever, but a limited arteritis in a small vessel 

 may escape this complication. If the disease is of long standing 

 there is atrophy of the tissues formerly supplied by the embolic 

 vessels. The secondary derangement of nutrition and function 



