vi PREFATORY NOTE 



essentials of Biophysics is in any way successful it is due to the 

 truly scientific atmosphere of the Institute of Physiology which 

 they govern and inspire. 



I beg to record my obligation to Dr. Shanks for the care he has 

 devoted to the chapter on the eye ; to Dr. Morris for reading the 

 first three sections of the book in slip-proof ; to Dr. Watt, Lecturer 

 on Psychology in this Institute, for reading the chapters on 

 Receptors and for his suggestions thereon ; to Dr. Wishart, 

 because, by reading many of the proofs and by checking 

 mathematical matter, he has saved me from many a fault and 

 blunder. 



My debts to previous authors are many and I cannot own 

 them all. Discerning readers will see, for example, the ideas of 

 my old teacher, Professor Soddy, mirrored in certain of the 

 earlier chapters ; Professor Thompson's Growth and Form is 

 the basis of part of Chapters XVI., XXIV. and XXXIV. ; 

 McKendrick, Gray, Wrightson, Keith, and Watt are the sources 

 from which much of Chaps. XIX. and XXIX. have been drawn. 

 A book of this nature could not be written without constant 

 reference to the Principles of General Physiology. If my Intro- 

 duction but serves to turn some student to the great book of 

 Professor Bayliss, to meet the master mind, it will have succeeded. 



I am under obligation to the authors and publishers of several 

 books from which illustrations have been borrowed. 



To Professor Noel Paton and Messrs. Green for permission to 

 use eight figures from the Essentials of Human Physiology (viz. 

 Figs. 25, 27, 58, 59, 69, 72, 73 and 85) ; to Professor Starling and 

 Messrs. Churchill for the following figures from Principles of 

 Human Physiology : 1, 5, 8, 16, 35-41, 43, 45, 50, 70, 74, 75, 

 80 and 83 ; to Mr. Crowther for Fig. 21 from Molecular Physics, 

 and to Mr. Emil Hatschek for Figs. 7, 9 and 10 taken from 

 An Introduction to the Physics and Chemistry of Colloids, both 

 books from Messrs. Churchill. 



To Professor Cushny for leave to reproduce the ideal diagram of 

 a Malpighian corpuscle (Fig. 28) from his monograph on The 

 Secretion of Urine (Messrs. Longmans, Green and Co.) ; to 

 Professor Soddy and " The Electrician " Publishing Co., for the 

 diagram of the gold-leaf electroscope (Fig. 22) from Radioactivity. 



To Dr. Bradford for allowing me to reproduce, from the Bio- 

 chemical Journal, his photograph of adsorptive stratification 

 (Fig. 11) and to Professor Roaf for the pH-C H graph reproduced 

 from the Proceedings of the Physiological Society (Fig. 84). 



