PREFACE TO THE SECOND EDITION, 



THE second edition of this book has been enlarged by the addi- 

 tion of two hundred and forty pages. Considerable new matter has 

 been inserted, for Physiology is a science undergoing continuous 

 development. 



The subject of electro-physiology has been treated more com- 

 prehensively than in the first edition. The article upon the sympa- 

 thetic system has been nearly entirely re-written. The latest acqui- 

 sitions in this direction have been incorporated. The chapter on 

 Vision has been entirely recast. In fact, nearly every page has been 

 subjected to alterations and emendations. The work upon peristalsis 

 of intestines in the Medico- Chirurgical laboratory has been incorpor- 

 ated. Over two hundred and fifty additional figures, many of them 

 entirely original, have been included in this edition. 



In the chapter on Eeproduction, the first eleven pages and the 

 part headed "Evolution" have been contributed by Dr. P. Fischelis, 

 Demonstrator of Histology and Embryology, Medico-Chirurgical 

 College. 



My cordial thanks are due to Dr. E. T. Rehrig for the com- 

 plete index. 



ISAAC OTT. 



