SPECIAL PARTS AND THEIR DISEASES 43 



and a double-like action when the chest is 

 falling to compress out the air, producing a 

 '* furrow " along the wall of the chest, or a 

 double expiration. 



Shivering: and String-halt. 



These are diseases connected with the 

 nervous system, and incurable. 



The first is often not easily brought to 

 light, whereas in other instances it is more 

 or less always present. It is denoted by a 

 quivering of certain groups of muscles, 

 particularly those of the tail, so that this 

 should be looked at in the stable, because it 

 is most likely to show itself here by a slight 

 elevation and quivering movement. 



Stringhalt affects one or both hind limbs, 



