TRANSLATOR'S PREFACE TO THE SEVENTH 

 AMERICAN EDITION 



WORKERS in Biochemistry are to be congratulated on the appearance 

 of a new edition of Hammarsten's " Physiologischen Chemie." At this 

 time, when so many new and important biochemical facts are being 

 published and when so many older theories and deductions are found 

 more or less erroneous, due to recent investigations using, new methods, 

 it is very fortunate that we have this complete and critical compilation 

 from the master hand of Professor Hammarsten, now in his 73d year. 

 We all owe him a great debt of gratitude for his painstaking work for so 

 many years. 



I take great pleasure in expressing my indebtedness to my assistant, 

 Dr. A. 0. Gettler, for the help he has given me in revising the proof and for 

 making the Indexes. 



JOHN A. MANDEL. 

 NEW YORK, June, 1914. 



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