DISEASES OF THE LYMPHATICS. 121 



DILATED (varicose) VEIN? 



'Diese are common over the distended hock joint in bog 

 spavin, and I have seen them in the posterior tibial and oth'^r 

 veins, but they are rarely or never injurious. 



ENTRANCE OF AIR INTO VEINS. 



If veins are opened in the lower part of the neck or elsewhere 

 in the vicinity of the chest, the suction-power may draw in air 

 in such quantity as to work the blood in the heart into a 

 frothy mass, and block the minute vessels in the lungs, causing 

 sudden death. There is heard a gurgling sound as it enters 

 the vein, and afterward tumultuous heart's action and a fine 

 squeaking sound in the lungs, while the animal falls in a faint. 

 The danger is not so great as is usually supposed, as it takes 

 several quarts suddenly introduced to kill a horse. Care is 

 requisite, however, to close promptly all large veins opened in 

 the vicinity of the chest. 



DISEASES UF THE LYMPHATICS. 

 LYMPHANGITIS. INFLAMMATION OF THE LYMPHATICS. 



This occurs in two forms, one a constitutional disease and 

 the other a simple local affection due to irritation of a wound 

 or the absorption of poisonous matter. 



CONSTITUTIONAL FORM. WEED. SHOT OF GREASE. 



This is seen mainly in heavy lymphatic fleshy-legged horses, 

 kept at hard work on heavy feeding, and in the midst of this 

 left in the stall for two or three days without any exercise or 

 change of feed. Thus it is common on Monday morning or 

 after one or two stormy days that have kept the horses indoors. 

 It is the result of a sudden access of plethora, but it may occur 

 in similar circumstances in over-worked and rather reduced 

 horses. In cither case it is due to an accumulation in the 



