PREFACE . xi 



lished in the pages of the British Medical Journal, together with 

 an abstract of the second, the biologist whose attitude with 

 reference to adaptation was the origin of those Lectures, saw fit 

 to criticize them more suo. That my readers, with the Lectures 

 before them, may reach their own conclusions regarding the 

 validity of the criticism, it has been deemed proper to publish 

 the correspondence as an Appendix. 



It is my pleasant duty to acknowledge my indebtedness to 

 Messrs. Macmillan & Co. for their permission to reprint here 

 the greater portion of a chapter from an article published origin- 

 ally in Sir T. Clifford Allbutt's System of Medicine, and republished 

 subsequently in book form under the title Inflammation ; to 

 Messrs. Lea Brothers & Co. (now Messrs. Lea & Febiger) of 

 Philadelphia, for permission similarly to publish an extract 

 from an article on " Inheritance and Disease " contributed to 

 Sir William Osier's Modern Medicine, to the Harvey Society 

 of New York, and the Editors of International Clinics, British 

 Medical Journal, the Lancet, New York Medical Journal, Mon- 

 treal Medical Journal and its successor the Journal of the 

 Canadian Medical Association, the Journal of Pathology and 

 Bacteriology, Medical Chronicle, and Clinical Journal, to reprint 

 articles contributed to their pages. To my friend, Captain 

 R. G. Mathews, C.A.M.C., I am indebted for kindly co-operation 

 in the preparation of the illustrations. 



LONDON, August 1917. 



