The Logic of Evohttion 



cles. These build roads, write poems, and utter 

 " winged words." But these muscles are of very 

 different age, strength, and complexity of ar- 

 rangement. The manifestation of energy is 

 stimulated, controlled, and directed by the ner- 

 vous system. Every display of power takes 

 place in response to an external stimulus which 

 affects some sensory organ or structure. It is 

 made to avoid some danger, to seize some oppor- 

 tunity, or to meet some emergency. Hence the 

 need of clear and accurate perception. New 

 emergencies and opportunities are always arising 

 and calling for new responses. Life is a series 

 of experiments demanding the highest intelli- 

 gence and wisdom. 



Man is a social being. Family and social life, 

 rooted in human structure, have imposed upon 

 him new relations which he must recognize and 

 to which he must conform. The family has 

 trained him to intelligence and unselfishness and 

 many homely v^irtues. Social life is, or should 

 be, the school of morals. Man is a religious 

 being and must recognize his relations and duties 

 to God as well as to his fellow-men. 



Man chooses means and ends consciously and 

 intelligently. The goal of his effort once chosen, 

 7 83 



