I0o Dynamic Evolution 



the value of these sires and dams as breeders. 

 The result is that technical records are more 

 numerous for first foals than for later ones. 



The facts given here, and other facts to be 

 found in the pedigrees, indicate that a geld- 

 ing is essentially an immature animal. He 

 grows old without becoming mature. There 

 are also indications that the gelding pedi- 

 grees will throw light on the problem of 

 neuters among insects, but there is not space 

 here to consider that matter. 



In coming to grandparents and earlier 

 progenitors of 2 : 10 trotters we find more 

 definite and precise information than we find 

 in the parents. We also find some new 

 information. Part of this new information 

 relates to the difference between performance 

 and " breeding on," and part to some peculiar 

 things in transmission. 



Mention was previously made of the horse 

 George Wilkes which was on the race track 

 longer than any other stallion known to 

 history, and which was bred after retirement. 

 George Wilkes was not the sire of any 2 : 10 



