INTRODUCTION 7 



It may be that some reader to whose attention this 

 collection of essays may come has some criticism or 

 comment to make, and it is requested that if this oc- 

 curs copies of the letters directed to the essayists be 

 sent to the undersigned in order that he may benefit 

 from such correspondence. 



In closing I desire to express appreciation to those 

 who have interested themselves in this contest, and 

 especially to Dr. Edwin B. Tuteur, of Chicago, who 

 very kindly assisted me in determining the disposition 

 of the prize money. 



HENRY R. HARROWER. 

 The Harrower Laboratory, 

 Glendale, California, 

 February, Nineteen Twenty-one. 



