PREFACE 

IN response to numerous requests I have brought together into this volume
eight papers which may serve as a supplement to the volumes previously
published[*] and as a preface to monographs now in preparation. 

[*] Surgical Shock, 1899; Surgery of the Respiratory System, 1899;
Problems Relating to Surgical Operations, 1901; Blood Pressure
in Surgery, 1903; Hemorrhage and Transfusion, 1909;
Anemia and Resuscitation, 1914; and Anoci-association, 1914
(with Dr.  W.  E.  Lower). 

In the first of these addresses, the Ether Day Address, delivered at
the Massachusetts General Hospital in October, 1910, I first
enunciated the Kinetic Theory of Shock, the key to which was found
in laboratory researches and in a study of Darwin's "Expression
of the Emotions in Man and in Animals," whereby the phylogenetic
origin of the emotions was made manifest and the pathologic
identity of surgical and emotional shock was established.
Since 1910 my associates and I have continued our researches through--