The 2:10 Trotters 107 



the next, and this work is followed by idle- 

 ness before reproduction, then the progeny 

 coming after this idle period have less energy 

 than those produced before the idle period 

 began. 



These are plain facts seen primarily by the 

 ages of the sires and dams included in the 

 table, and secondarily by the relationship 

 existing between these ages and the known 

 work performed. They indicate, as plainly 

 as facts can indicate, what work was per- 

 formed in connection with each generation 

 to cause the next succeeding one to inherit 

 more energy than its predecessor. The fact 

 that there has been a steadily increasing con- 

 centration of energy, generation after genera- 

 tion, indicates that further concentration may 

 be made by further work of the same kind 

 applied in the same way. A limit is no more 

 obvious now than it was when the first 2 : 30 

 trotter appeared. 



