EDITOR'S PREFATORY NOTE v 



either method of procedure, but both editors and publishers believe that 

 their decision will be generally sanctioned. 



As the preparation of the work has progressed it has become clear that 

 we have been engaged upon an important and rewarding enterprise. The 

 volumes include the results of researches on metabolism and internal secre- 

 tions in all countries. No attempt has been made to magnify the achieve- 

 ments of our own country at the expense of others. On the contrary, the 

 effort has been made to do justice to the workers in these fields among all 

 the nations of the world. 



BALTIMORE LEWELLYS F. BARKER 



