Effects of Two Generations III 



George Wilkes was much better as a sire of 

 fast stallions than he was as a sire of fast 

 mares or fast geldings, but those sons of 

 his which were considerably trained in their 

 immature stage and not much in their adult 

 stage were better as sires of fast mares and 

 geldings than of fast stallions. The same 

 thing is generally true of all stallions which 

 were considerably developed by trotting work 

 when adult and whose sons were developed 

 in their colthood. The uniformity and gen- 

 erality of these facts are impressive, and 

 there appears to be no explanation other 

 than that given. 



The horses George Wilkes, Robert Mc- 

 Gregor, Woodford Mambrino, and several 

 other stallions were raced extensively after 

 becoming mature, and they acquired a good 

 deal of energy by this work. These horses 

 sired quite a number of daughters, and these 

 daughters had produced 357 standard per- 

 formers up to the time this investigation was 

 made. About one-third of all performers are 

 stallions and about two-thirds are mares and 



