PREFACE TO THE SECOND EDITION 



DURING the short time that has elapsed since the publi< 

 of the first edition of this work physiology has mad? some 

 considerable advances, and I have found it necessary to re-write 

 much of the sections dealing with voluntary muscle and with 

 the circulation, in addition to making many modifications in 

 other parts of the work. New sections have also been intro- 

 duced dealing with the nutrition of the brain and with the 

 innervation of the bronchi. 



I am much indebted to many friends, known and unknown, 

 who have pointed out mistakes and omissions in the first edition. 

 I shall be glad to receive any suggestions as to points in which 

 this text-book may be made more useful to students. 



UNIVERSITY COLLEGE, LONDON 



