viii PREFACE TO THE FIRST EDITION 



first three sections of the book in shp-proot' ; 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 Chapters XIX. and XXIX. have been 

 drawn. A book of this nature could not be written without con- 

 stant reference to the Principles of General Physiology. If my 

 Introduction 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. 41, 47, 85, 86, 95, 98, 101 and 116) ; to Professor Starling and 

 Messrs. Churchill for the following figures from Principles of 

 Human Physiology: 1, 10, 16, 31, 56-59, 63, 65, 73, 96, 97, 103, 

 105, 107, 112 and 114 ; to Mr. Crowther for Fig. 39 from Molecular 

 Physics, and to Mr. Emil Hatschek for Figs. 15, 19 and 20 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. 46) from his monograph on The 

 Secretion of Urine (Messrs. Longmans, (ircen and Co.) : to Pro- 

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

 diagram of the gold-leaf electroscope (Fig. 40) from Radioactivity. 



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

 chemical Journal, his photograph of adsorptive stratification 

 (Fig. 17), and to Professor Roaf for the pll-C\ graph reproduced 

 from the Proceedings of the Physiological Society (Fig. 115). 



To Messrs. the Cambridge and Paul Scientific Instrument Co. 

 for the figures illustrating the electro-cardiograph (Figs. 91, 92 and 

 93) ; to Messrs. Hawksley for those of the viscosimeter (Figs. 108 

 and 110), and to Messrs. Gallenkamp for Figs. 3 and 102 of the 

 bomb calorimeter. 



The remaining illustrations were drawn by Dr. G. M. Wishart, 

 Assistant in the Department of Chemical Physiology, and by Mr. 



