PREFACE TO THE THIRD EDITION 



WHILE adhering to the same principles which I have followed in previous 

 editions of this book, I have in the present edition thoroughly revised almost 

 all the chapters. In this work of revision the monographic discussions con- 

 tained in the " Ergebnissen der Physiologic " have been of very great service 

 to me, and I would especially direct the reader who may be interested in a 

 deeper study of modern physiology to this collective work. 



The more recent literature bearing on the subjects contained in Chapters 

 I to XIV inclusive could for the most part be brought up only to the end of 

 1903. In the revision of the remaining chapters I have been able to make 

 use of the literature of the first half of the present year. 



EGBERT TIGERSTEDT. 

 HELSINGFORS, October 1, 1904. 



