36 Dynamic Evolution 



That animal energy is being continually 

 dissipated is a fact of observation, seen by 

 noting that an idle animal becomes weak. 



That a certain amount of energy is con- 

 sumed in keeping the animal machine in 

 operation is a second fact of observation, 

 seen by noting that even an idle animal must 

 be fed or it will die. 



That energy is concentrated in a living 

 organism by the expenditure of previously 

 existing energy of the same kind in the form 

 of work or exercise is a third fact of observa- 

 tion familiar to all trainers. 



That animal qualities persist with uni- 

 formity through successive generations is a 

 fourth fact of observation, seen by noting that 

 horses come from horses, goats from goats, 

 rabbits from rabbits, etc. 



