PREFACE 



It was to me a great honour to be invited to deliver the 

 Herter Lectures. I am very grateful for the splendid re- 

 ception, given me by the Medical Faculty at Baltimore, 

 April 1926. It is not necessary to thank each of my col- 

 leagues individually, because Johns Hopkins University is 

 a real unit. 



As a representative of Dutch neurology I have given my 

 lectures, based on the anatomy and the physiology of the 

 nervous system. Many of us in Holland work along this 

 line. 



I know that not a few of my explanations in my lectures 

 were hypothetical and that many facts might be differently 

 interpreted. But in preparing these Herter lectures I 

 felt that it was not wise to limit myself to bring facts, found 

 b}^ my research work. My American colleagues did not 

 ask me to come to Baltimore to hear only some objective 

 facts. They desired also to get an impression of my per- 

 sonality. A personality is always dualistic, good and bad. 

 This psychological fact is not always clear, but is always 

 true. My ideas may be right or wrong, in any case they 

 are part of my personality, for I beheve in them. 



B. Brouwer. 



University of Amsterdam 

 1926. 



