no Dynamic Evolution 



lated energy was sexual in character and was 

 transmitted in accordance with the laws gov- 

 erning the transmission of secondary sexual 

 characters, and also assume that a male 

 descendant (son or grandson) which inherits 

 this accumulation can, by special activity 

 during the immature stage, transform his 

 inheritance into an ordinary or non-sexual 

 character, then we have a complete explana- 

 tion of the phenomena. The peculiarity 

 pointed out here is not an isolated instance. 

 The same thing can be found, in a less pro- 

 nounced form, running through every one of 

 the 1 80 pedigrees which is not too fragmen- 

 tary to show anything. The 2 : 10 trotters 

 are most frequently produced when the adult 

 development of sires of sires is greater than 

 that of sires of dams, and also when that of 

 the dams of dams is greater than that of the 

 dams of sires. Both of these are shown in 

 the pedigrees of stallions, pedigrees of mares, 

 and pedigrees of geldings ; by records, by ages, 

 and by amount of trotting work done. Nor 

 are these facts confined to the 2 : 10 trotters. 



