ACKNOWLEDGMENT 



9 The writer expresses his indebtedness to those 

 ^ whose contributions have made the following 

 " generalizations possible. It is impracticable to 

 cite each one in the text of such a book as this, but 

 it should be clearly recognized that an enormous 

 amount of research had to precede such condu- 

 it' sions as these stated in this work. 



The writer also wishes it to be kept in mind 

 that he appreciates that there are many other im- 

 portant aspects of man, especially his religious 

 experiences, but these include fields that others 

 > have repeatedly discussed. No attempt is made 

 i to deduce the philosophical conclusions that natu- 

 5 rally follow from biological generalizations, be- 

 cause this is a phase of the question that belongs 

 to one trained in philosophy, 



A more interesting account of the relationships 

 of biology to man could be written if one were 

 willing to select only the more compelling and 

 dramatic aspects of that relationship, but such a 

 description would be incomplete and but partially 



vii 



