20 Dynamic Evolution 



as " Heredity. " The fact that heredity repre- 

 sents the persistence of matter and energy 

 through successive generations in their previ- 

 ous conditions makes it analogous to, if not 

 identical in principle with, what is known as 

 Inertia. It is an observed fact that while the 

 individuals of one generation are like those 

 of the next, the likeness does not amount to 

 identity. Differences may be seen and meas- 

 ured. It is also an observed fact that the 

 individuals of each generation are subjected 

 to different and varying actions of energy 

 before reproduction. The energy here in- 

 volved is principally, if not exclusively, that 

 which is within and operates through the 

 organism. It is that energy which is implied 

 when we speak of the dynamic development 

 of an animal. Outside energy which is of 

 insufficient magnitude to overcome the inside 

 energy known as "life" appears to have no 

 direct effect upon the resistance known as 

 heredity. A consideration of the indirect 

 effect of outside energy involves a complexity 

 which is avoided as not being necessary to 



