30 Dynamic Evolution 



mal, the factors by which the positive or 

 negative amount of concentration may be 

 calculated, and the conditions which must be 

 fulfilled to have this concentration the maxi- 

 mum within the life of a single individual. 

 This theoretical maximum is never obtained 

 in practice: first, because the rate of concen- 

 tration is never at its maximum for long 

 periods of time; and second, because net 

 gain is usually changed to net loss at a greater 

 or less length of time prior to that time in life 

 at which net gain must necessarily cease. 



But feeding and training an ordinary horse 

 will not make him a 2 : 10 trotter. Like the 

 poet, the 2 : 10 trotter is born and not made. 

 Being "born " must not be construed to mean 

 that because he is not made in one generation 

 he is actually not made at all. It will not do 

 to waive the matter aside by the statement 

 that the animal is born and not made, and 

 thus assume that energy was either created 

 or accidentally concentrated in the reproduc- 

 tive process. We must go further in tracing 

 the source of that energy. 



