lo May, 1 910.] Hereditary Unsoundness in Horses. 347 



Families 3, 4, 5, and 6. — Four families in which two sons (sires not examined 

 in two cases) were found to have curbs, thus — 



1. Sire — B (sound). Sons — H A (curb) ; 



I (curb). 



2. Sire — I A A (sound). Sons — I (curb) ; 



G (curb). 



3. Sire— E (X.E.). Sons— E Q X (curb); 



E (curb). 



4. Sire— T (X.E.). Sons— H (curb); 



H (curb). 



Family 7. — One son and one grandson (sire not examined), thus — 



Sire— H (X.E.) ; Son— I E (curb) ; 



Grandson — X Q (curb). 



Bog Spavin. — In one sense, the evidence of hereditary influence in the 

 causation of bog spavin (inckiding thoroughpin) is more pronounced than in 

 respect of sidebone. There are no less than nine families in which a varying 

 number of descendants have been found affected with bog spavin.* 



In the case of one sire, five sons have had bog spavin, viz. : — 



Family 1. Sire — P . Sons — X , 



P . 



B . 



S D . 



Q . 



In two cases, three sons by the same sire had bog spavin, viz. : — 



Family 2. Sire — G . Sons — D , 



H C , 



G . 



Family 3. Sire— E I M . Sons— B H . 



H U . 



(Two other sons examined — sound.) 



In one case, two sons and one grandson had bog spavin, viz. : — 



Family 4. Sire — D S . Sons — Z S , 



K C . 



G ranis an — E . 



In three other cases, two sons of the same sire had bog spavin, viz. : — 



Family 5. tSire — C . Sons — C Q . 



D Q . 



Family 6. Sire— Q D . Sons— U D , 



G A . 



Family 7. Sire— Q of B . Sons— T S , 



B Q . 



In one case, a sire and son have been examined and rejected for bog spavin, 

 viz. : — 



Family 8. Sire — C . Son — R C . 



In one case, a son and grandson of one sire have been rejected for bog 



spavin, viz. : — 



Family 9. Sire— Z L . Son— T B . 



Grandson — C U . 



* The horses referred to have not necessarily been rejected on account of this par.icular 

 unsoundness — bog spavin. 



