Introduction vii 



to my lot, I have accepted the responsibility with pleasure, 

 since it gives me a fitting opportunity to make a partial 

 expression of my indebtedness to the author for years of 

 efficient assistance in the conduct of our classes in neu- 

 rology, and to point to this volume as evidence of one 

 way in which that assistance has been rendered. 



Henry H. Donaldson. 



University of Chicago, 

 October 1 6, igoi. 



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