TRANSLATOR'S PREFACE TO THE SIXTH AMERICAN 



EDITION. 



ALTHOUGH a number of excellent works on Physiological Chemistry 

 have appeared during the past few years, HAMMARSTEN'S " Physiologischen 

 Chemie " maintains its early popularity; and I am confident that all 

 workers in biochemical research are thankful to Professor HAMMARSTEN 

 for the labor and care that he has exercised in the prepartion of the present 

 edition. 



The work of translating and editing has been a labor of love, inas- 

 much as I feel that it will be of aid in the advance of this department 

 of chemical science. 



I am indebted to my assistant, Mr. A. O. GETTLER, for help given 

 in revising the proof. 



JOHN A. MANDEL. 



NEW YORK, April, 1911 



