ON YELLOWS. 4^5 



difeafe, is fuppofed to be a ftagnation of the 

 blood in the plexus c/ioroides, and other fmall 

 vefTels of the brain, which preffing upon the 

 origin of the nerves^ impedes the aaion of the 

 animal fpirits, and puts a fudden ftop to the 

 funaions of hfe. The remote caufes are, ge- 

 nerally, over-fulnefs, richnefs, or fluggiflmefs of 



the blood. 



The HEAD-ACH in horfes, mentioned by all 

 the old writers, is generally a prelude to the 

 ftaggers, as is alfo vertigo or giddinefs (for- 

 merly called the STURDY or turnsick) which 

 fymptom makes its appearance on their firft 

 being led into the air from the liable. The 

 figns of the head-ache are, hanging down of 

 the head, drooping of the ears, dull and watery 

 eyes, dropping of urine, and coftivenefs. Pro- 

 bably the pain of the head and vertigo arife, at 

 firft, merely from aflbciation with the nervous 

 coat of the ftomach, the original feat of the ob- 

 ftruaion, which being negleaed, it at laft reaches 

 the brain, and a fit of the apoplexy, or ftaggers, 

 is the immediate confequence. The horfe falls 

 fuddenly,and although fometimes the paroxifm 

 will in feven or eight minutes exhauft itfelf, and 

 the animal recover, and arife without aftiftance; 

 yet, in many cafes, unlefs timely relief were af- 

 forded by opening a vein (the only remedy) 

 death would be the confequence in a very ftiort 

 fpace. The fit is fometimes attended with ftrong 



and 



