96 Dynamic Evolution 



the books at all, and are not standard bred. 

 The facts of their pedigrees were learned only- 

 after their daughters became famous on the 

 track. This is the case with the dam of Lou 

 Dillon, the one-time fastest trotter in the 

 world. These facts indicate strongly that 

 the dams of the 2:10 mares were workers and 

 not breeders in the sense that they were se- 

 lected in their early age to become brood 

 mares because of their known merits. 



One of these 2:10 mares was out of a three- 

 year-old dam without a record, and no in- 

 formation as to what happened to that dam 

 in her one-year-old form. This almost cer- 

 tainly represents a loss of energy by the 

 dam which would ordinarily preclude the 

 production of a 2 : 10 mare, but the other 

 things involved are unusual. The sire of 

 this 2 : 10 mare was extremely developed in 

 his youth and was the champion three-year- 

 old trotter of his day. Back of this three- 

 year-old dam was an unusual amount of 

 development, the nature of which may be 

 surmised by the fact that she was half-sister 



