PREFACE TO THIRD EDITION 



Readers of the first edition of this book will find 

 that approximately half of the present volume is 

 new, hence the change in title. Large sections have 

 been omitted to make room for these additions 

 without greatly increasing the size of the book. 



In the third edition, new chapters are introduced 

 on vitamines and the genital glands ; the articles 

 on surgical shock, the digestive apparatus, the 

 pituitary and pineal glands, and on chloroform 

 poisoning are largely rewritten. There are also 

 important additions to the chapters on the thyroid 

 gland and the physiology of the spinal cord, besides 

 minor changes elsewhere. 



A. R. S. 



June, 1914. 



