Diseases of Blood-vessels and Lymphatics. 121 



forming on the inflamed lining membrane being washed 

 on in greater or less amount, to set up inflammation in the 

 lungs and elsewhere. 



DILATED (varicose) VEINS. 



These are common over the distended hock joint in bog 

 spaviu and I have seen them in the posterior tibial and 

 other 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 else- 

 where 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 

 tlie lungs, causing sudden death. There is heard a gurg- 

 ling 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 OF THE LYMPHATICS. 

 LYMPHANGITIS. INFLAMMATION OF THE LYMPHATICS. 



This occurs in two forms, one a constitutional disease 

 and the other a simple local afTection 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 hoi-ses indoors. It is the result of a 

 Budden access of plethora, but it may occui' iu similar 

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