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PREFACE TO THE THIRD EDITION. 



IN preparing the third edition of the Physiological Chemistry 

 the writer has attempted to bring the volume up to date without 

 increasing its size. This has been somewhat difficult in view 

 of the large amount of literature which had to be considered. It 

 has been accomplished, however, by eliminating all unnecessary 

 theoretical discussions and by presenting only such fundamental 

 facts as seemed essential to a proper understanding of the sub- 

 ject matter. The aim of the writer has been, as heretofore, 

 to present a text-book for the use of medical students and phy- 

 sicians who wish to keep abreast of one of the most important 

 branches of modern medicine, and also a guide to practical work 

 in the laboratory. 



CHARLES E. SIMON. 

 1302 MADISON AVENUE, BALTIMORE, MD., 

 1907. 



COLLEGE OF DENTISTRY 

 UNIVERSITY OF CALIFORNIA 



