HEREDITARY UNSOUNDNESS. 53 



in mares and horses that are reserved for breeding 

 purposes ; for the law of heredity is well marked in the 

 tendency, possessed by some animals, to throw out bony 

 deposits on the limbs, at, and below, the knees and 

 hocks. 



Thick wind, 



Thorouglipin. — See " Bog-spavin," page 50. 



Wliistling. 



