feller Foundation. It was primarily through the interest and the 

 kind mediatorship of Professor C. J. Herrick of the University of 

 Chicago that these experiments were undertaken and the valuable 

 cooperation of Dr. K. S. Lashley was secured. Part of the exami- 

 nation of the material was carried out at the University of Chicago 

 (Department of Anatomy), part at the Neurological Clinic of the Uni- 

 versity of Zagreb, Yugoslavia, part at the University of California 

 (Department of Anatomy), Berkeley, and a part at the University of 

 Chicago (Department of Medicine), all of which contributed their 

 share of material help. The work was also supported by a grant from 

 the Otho S. A. Sprague Memorial Institute, and by a grant from the 

 Douglas Smith Foundation for Medical Research of the University of 

 Chicago. Friends have helped in the revision of the English text and 

 for this I wish to express my thanks to Mr. Lamar Jackson, Turlock, 

 California, to Mrs. Miriam Goldeen, Berkeley, to Miss C. M. Flinn, 

 Berkeley, to Mr. B. Browntield, and especially to Professor I. Maclaren 

 Thompson of the University of California, Berkeley, as also to Pro- 

 fessor R. R. Grinker (Chicago) and to my wife Donna. Thanks have 

 to be expressed to Dr. L. Wiley for his kind assistance in the experi- 

 ments. Acknowledgment is due also to the University of California for 

 the publication of the work with its numerous costly illustrations ; and 

 to Miss Gladys Alvarez for the trying task of typing the manuscript. 

 Gratitude is expressed for the help in making numerous series of sec- 

 tions to Miss R. Bigelow (Chicago), and to Miss J. Newson (Chicago) 

 for the help in preparing the manuscript. It is a pleasure to acknowl- 

 edge the kind interest and support of Professor.M. N. Lapinsky (Bel- 

 grade), of Professor K. S. Lashley (Chicago), of Professor G. W. 

 Bartelmez (Chicago), of Professor P. Bailey (Chicago), and of Pro- 

 fessor F. C. McLean (Chicago), whereby the work has been furthered. 

 For being able to prosecute this work successfully and to finish it I 

 feel obliged especially to thank Professor H. ]\I. Evans, head of the 

 Department of Anatomy at the University of California, for his great 

 interest in this work, for his liberal support, for his unusual kindness 

 in correcting the entire manuscript, and for the arrangement of the 

 publication. 



[ix] 



