xii INTRODUCTION TO THE AMERICAN EDITION 



practice is based. It must be granted that some of the phenomena of life 

 are to be explained only by theoretical induction. But this is the daily 

 experience of every physician as regards his patient, for he is called upon 

 to interpret disease caused by processes which he cannot see. Tigerstedt's 

 judicious selection of the facts of physiology, and their interpretation along 

 lines of modern critical research, afford to the student of medicine an oppor- 

 tunity for that kind of intellectual training which best fits him to interpret 

 phenomena both of health and of disease. 



The book may be earnestly commended to the medical student and to 

 the practitioner. 



GRAHAM LUSK. 



UNIVERSITY AND BELLEVUE HOSPITAL MEDICAL COLLEGE, 

 NEW YORK. 



