lo May, 1910.] Hereditary Viisouiidncss in Horses. 



339 



Sire 



Sons 



Great 

 Grandson 



Age. 



Aged 

 Aged 

 Aged 

 Aged 

 6 years 

 6 years 

 6 years 

 5 years 

 5 years 

 5 years 

 4 years 

 4 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 2 years 



5 years 

 5 years 

 5 years 

 4 years 

 4 years 

 4 years 

 4 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 



3 years 



Table X. — Sound Families. 

 Family " A." 

 T M • — (not examined). 



Sound (35). 



N S 



Age. 



3 years 



Aged 

 6 years 

 5 years 

 5 years 

 4 years 

 3 vears 



Sideboned (7). 



Remarks. — 83 '3% of progeny sound : 16 '7% sideboned. 

 95% of sons sound ; 5% sideboned. 



72 "7% of grandsons and great grandsons sound: 27% sideboned. 

 Clearly the increase in number of sideboned grandsons over sons is due to the introduction of sidebone 

 blood through the dams, especially seeing the preponderance of aged sound horses amongst the sons. 



Sire 



Famhy " B." 

 Q — • (not examined). 



Grandsons 



Age. 



Aged 

 6 years 



Aged 

 Aged 

 5 years 

 4 years 

 4 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 

 3 years 



Sound (31). 



Age. 



3 years 



Sideboned (1). 



