PREFACE TO THE EIGHTH GERMAN EDITION 



THE revision of this edition has been accomplished with the collabora- 

 tion of Professor S. G. Hedin, and the work has been divided so that 

 Hedin has revised Chapters I, III, VIII, XII and XVI, besides the Index 

 of Authors, while Hammarsten has revised Chapters II, IV, V, VI, VII, 

 IX, X, XI, XIII, XIV, XV, and XVII, besides the General Index. 

 The numerous recent developments in physiological chemistry have made a 

 thorough revision and reconstruction necessary in all the chapters, and in 

 order to prevent a noticeable increase in the size of the work, it was also 

 necessary to change the arrangement of the foot-notes more economically 

 The number of chapters in this edition is XVII instead of XVIII as in the 

 seventh edition, because for several reasons it was found advisable to 

 combine the first two chapters of the seventh edition into one chapter, and 

 at the same time certain parts of the first chapter have been incorporated 

 into other chapters, thus for example the oxidation processes have been 

 introduced into Chapter XVI (on respiration and oxidation). In general 

 the plan of the work remains unchanged. 



OLOF HAMMARSTEN. 



UPSALA, September, 1913. 



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