X PREFACE 



supplied from time to time to the Henry S. Denison Re- 

 search Laboratories, and for the Hbrary facihties that she 

 has so generously provided in the University of Colorado 

 School of Medicine. 



Lastly, it is a genuine pleasure to acknowledge my in- 

 debtedness to the publishers, The Wilhams & Wilkins 

 Company, for assuming the responsibihty to pubhsh this 

 book, and for pleasant and courteous deahngs. 



Ivan E. Wallin. 



University of Colorado School of Medicine, 

 Denver, August 18, 1926. 



