PREFACE 



THE aim of this book is to give a readable account of 

 the chemical processes that take place in living 

 organisms. 



Although the discussions of various problems represent 

 my own views I have endeavoured to give references to 

 original sources for actual statements of recorded facts and for 

 deductions from the same. These references are of two kinds, 

 Ihose giving the first statement of the point mentioned, and 

 those giving recent details or general discussions from which 

 the reader can trace the development of the subject. 



I have much pleasure in thanking the following for use 

 of illustrations as recorded in the text : The Editor of the 

 "Annals of Botany," Mr. J. Barcroft, F.R.S., Prof. W. M. 

 Bayliss, F.R.S., Prof. F.F. Blackman, F.R.S., Prof. H. Gushing, 

 Dr. R. Hutchison, Messrs. Longmans, Green & Co., The Medical 

 Research Council, The Editor of the " Journal of Physiology," 

 The Editor of " The Practitioner, The Council of the Royal 

 Society," Sir E. S. Schafer, F.R.S., Prof. Sutherland Simpson 

 and Prof. A. D. Waller, F.R.S. 



H. E. ROAF 



LONDON HOSPITAL MEDICAL COLLEGE 

 LONDON, E.I. 



