

Visualization 97 



Struggle prevents these processes, retains old 

 structure because its particular form is of use 

 to the organism, and diminishes the nutri- 

 ment, and therefore the surplus energy, of each 

 competitive organism. The insufficient expen- 

 diture of the smaller fund of energy in strug- 

 gling organisms at length stops the displace- 

 ment and replacement of structure. But an 

 embryo which has no struggle but plenty of 

 surplus energy builds, tears down, and replaces 

 structure in a hundred ways. The adult uses 

 its diminished fund of energy to repair old 

 useful structure. Energy traversing this old 

 structure is habit, and when it assumes fixed 

 forms like useful recollections, we call them 

 " associated ideas " ; but habits and associations 

 are only remnants of mental life in the retained 

 structures, while sensation is visualization 

 dimmed and regulated by passing through 

 these same hardened structures. 



When a structure is so hardened that it can- 

 not change, the same product following each ex- 

 citation enables men to judge accurately of the 

 external world and to increase their chances of 

 survival. Had energy remained abundant and 



