PREFACE. 



IT has been the object of the author, in writing this book, to present 

 the subject of Biochemistry in close relationship to Physiology, so 

 that the student may perceive the intimate dependence, of these 

 two sciences upon one another and come to regard physiological 

 chemistry in its true light, as the foundation upon which we must 

 ultimately build our interpretations of the functions of living matter. 

 Emphasis has been placed upon the practical applications of the 

 subject, and not only upon applications to the practice of medicine, 

 but also upon applications to the industries and to general biology, 

 for while the design of the author has been primarily to write a text- 

 book for the use of medical students and student's intending to special- 

 ize in biochemistry and physiology, the attempt has also been made 

 to compile a work which will be of service to the agricultural student, 

 the student of general biology, or the industrial chemist who is engaged 

 in handling biological products. 



I am deeply indebted to my colleague, Prof. Hardolph Wasteneys, 

 for his valuable cooperation in preparing the manuscript for the 

 press, correcting proofs and compiling the index; and I desire to 

 acknowledge my indebtedness to my wife for her assistance in the 

 preparation of some of the illustrations. 



T. BRAILSFORD ROBERTSON. 



ADELAIDE, SOUTH AUSTRALIA, 1920. 



