INFLAMMATION OF THE JUGULAR VEIN. 673 



otherwise. If atscssses have already formed, tliey miist be 

 opened before the blister is applied, for if tliis precaution be 

 not taken, the pus may break down the barrier which surrounds 

 it, thus entering the circulation, and leading to very serious or 

 even latal consequences. 



I find that writers upon human surgery recommend leeches, 

 fomentations, poultices, and other methods of treatment which 

 — in veterinary practice, at least — have been found to retard 

 the healing process, and I would sug!:;est very respectfully that 

 the method by blistering is worthy of their consideration. 



Inflammation of the jugular always terminates in the conver- 

 sion of the vessel into an impervious cord, by the organization 

 of the clot; and for this reason a horse having suffered from it 

 should not be turned out to grass, as the collateral circulation 

 seems to be insufficient to convey the blood from the head whilst 

 it is kept in the depending position during grazing; and as a 

 consequence much serum is effused into tlie areolar tissue of the 

 face, cheeks, lips, and nostrils, interfering with the process of 

 mastication.; and by diminishing the calibre of tlie nostrils, pre- 

 venting the due admission of air into the lungs. 



DIFFUSE PHLEBITIS. 



This originates from irritation of a vein, as from punctured 

 ^oun(jls in tbeir vicinity, or it may supervene on the circum- 

 scribed form, the barrier 'to the admission of tlie pus — already 

 described — giving way from some cause. The symptoms differ 

 from those of the circumscribed form by extension of the swell- 

 ing along the course of the vein, swelling of the lymphatics, 

 acute oedema, and tension of the part resembling an erysipela- 

 tous inflammation. 



In acute diffuse phlebitis the inflammation extends along the 

 lining membrane ; fibrinous deposits are formed in various 

 parts, and even in the right side of the heart. In other cases, 

 where the progress of the disease is slower, the joints become 

 affected by purulent deposits. 



Wherever there is extensive venous circulation, as in the 

 lungs, liver, joints, and intermuscular areolar tissue, there 

 Tenous ccngestioa and effusion take place; inflammacinn and 

 •bscessea follow. The following case may advantageously be. 



